Article
Materials Science, Multidisciplinary
Tao Lin, Qianghua Li, Yu Han, Ke Song, Xueting Wang, Huiping Shao, Jianhui Dong, Hao Wang, Xin Deng
Summary: Cemented carbides (WC-Co-Ni) with the addition of Nb and NbC were prepared by powder metallurgy method. The microstructure and mechanical properties were analyzed. The results showed that the addition of Nb or NbC can reduce the grain size of WC. Nb has a stronger inhibitory effect on WC grain growth than NbC. The transverse fracture strength of the samples first increased and then decreased with the increase of Nb and NbC contents. The hardness of cemented carbides increased with the content of additives. The fracture toughness and impact toughness decreased with the increase of NbC and Nb contents.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Review
Engineering, Manufacturing
Cai Chen, Boyun Huang, Zuming Liu, Yongxia Li, Dan Zou, Tao Liu, Yiming Chang, Lei Chen
Summary: In this paper, the progress of additive manufacturing (AM) technology in WC-Co cemented carbides is reviewed. The two technology routes for AM of WC-Co cemented carbides, powder bed fusion (PBF) and forming-debinding-sintering (FDS), are introduced. The key influencing factors in preparation and the current research gaps and prospects of WC-Co cemented carbides using AM are analyzed.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Jinyang Liu, Xin Deng, Li Zhou, Jian Chen, Miaojun Huang, Shanghua Wu, Bingyao Liu
Summary: The nitridation process of WC-TiC-Ni/Co cemented carbides produced a bilayer-graded structure with face center cubic-rich outer layer and coarse grain intermediate layer, affecting the hardness and fracture toughness differently in each region. The fracture mode of the inner region is mainly intergranular fracture.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Weiyou Chen, Zengbin Yin, Xuelin Li, Juntang Yuan
Summary: Microwave sintering is an efficient method for preparing WC-10Co cemented carbide tool materials. Co-doped additives of metal carbides and rare earth oxide were found to significantly enhance the mechanical properties of the microwave-sintered cemented carbide. The WC-10Co-0.3Cr(3)C(2)-0.3VC-0.3Mo(2)C sintered at 1400 degrees C with a holding time of 10 min exhibited the best mechanical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Shiwei Li, Zhaoxi Li, Yipeng Chen, Yundi Zu, Jiangtao Xiong, Fusheng Zhang, Jinglong Li
Summary: This study investigated the diffusion bonding process of WC-Co cemented carbide to steel using different interlayers. The results showed that increasing the bonding temperature promoted interdiffusion, eliminating voids and enhancing interdiffusion in the steel side. The thickness of Co6W6C near the WC-Co substrate increased with temperature when using a Co interlayer. The addition of a Ni foil inhibited Co6W6C formation and resulted in a satisfactory shear strength of the joint by forming WC and (Ni, Co) solid solution. The maximum shear strength of 418 MPa was achieved at 1100 degrees C for 60 min using a composite Ni/Co interlayer.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Xuemei Liu, Zhantao Liang, Haibin Wang, Zhi Zhao, Chao Liu, Hao Lu, Xiaoyan Song
Summary: In this study, WCoB was added to ultra-coarse cemented carbides to improve the oxidation- and wear-resistance at elevated temperatures. The addition of WCoB enhanced wear resistance by restraining the WC grains, and also inhibited oxidation by forming liquid B2O3 in the oxidation layer and sharing stress with WC matrix.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Kai-Hua Shi, Ke-Chao Zhou, Zhi-You Li, Xiu-Qi Zan, Kai-Lin Dong, Qing Jiang
Summary: This study systematically investigated the effects of Co content on the microstructure, physical, and mechanical properties of ultrafine WC-Co-VC cemented carbides. The results showed that increasing Co content resulted in increased cobalt magnetism and bending strength, while decreased coercive force, Rockwell hardness, density, and abrasive wear resistance. Furthermore, the increase in Co content led to a decrease in the quantity and size of micro-pores and a transition from brittle fracture to ductile fracture.
Article
Materials Science, Multidisciplinary
Xian Wu, Jianyun Shen, Feng Jiang, Hairong Wu, Liang Li
Summary: This paper investigates the oxidation of WC-Co cemented carbide under both isothermally and laser irradiation conditions, and reveals that the microstructures of oxide layer in laser-induced oxidation are very different to isothermal oxidation. The oxide layer in laser-induced oxidation shows more porous structures and a mountain shape due to the Gaussian profile of pulsed laser beam. The oxygen content curve in laser-induced oxidation increases rapidly at the beginning and then stabilizes with increasing laser power.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Guangkai Fang, Huaguo Tang, Zhongkan Ren, Yue Cheng, Yuan Yu, Lujie Wang, Tongyang Li, Yanfei Zhang, Zhuhui Qiao
Summary: Two WC-6wt%Co cemented carbides with different grain sizes were prepared and investigated for their oxidation resistance at temperatures ranging from 600 to 800 degrees Celsius. The ultrafine-grained cemented carbide demonstrated decreased resistance to oxidation at low temperatures due to increased grain boundaries. However, at 800 degrees Celsius, the fine-grained cemented carbide showed poorer oxidation resistance than the ultrafine-grained one, attributed to larger intergranular fracture and disintegration behavior. The oxidation thermodynamics of WC/Co cemented carbide were discussed, and the color inconsistency of the two samples was observed and explained.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Stella Sten, Joakim Odqvist, Susanne Norgren, Peter Hedstrom
Summary: In this study, two functionally graded cemented carbide samples with gradients in composition and grain size were produced and studied. The samples were manufactured by adding TiC to a WC-Co green body followed by sintering. The composition profiles of Ti, Co, and C were analyzed using X-ray spectroscopy, and Vickers hardness profiles were measured. The concentration and hardness profiles showed a similar trend in both samples, with decreasing Ti and C concentrations and increasing Co concentration away from the TiC layer. The composition gradient affected the number of stable phases and the WC grain size, and there were differences between samples with different initial WC particle sizes. Abnormal grain growth occurred in both samples but was suppressed with increasing Ti concentration.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Xiongqiu Tang, Zhenhua Wang, Lei Huang, Xinzheng Wang, Tianxiao Chang, Peng Huang, Zhiwei Zhu
Summary: This paper investigates the preparation, properties, and microstructure of WC-Co cemented carbides with low binder content. The addition of a small amount of VC effectively refines the WC grains and enhances the performance of the cemented carbides. The cemented carbides prepared at different sintering temperatures show high hardness, high relative density, good fracture toughness, and transverse rupture strength. The strength and oxidation behavior of the cemented carbides are affected by temperature during the oxidation process. The cemented carbides exhibit different surface roughness when used for ultra-precision turning of brass, depending on the Co content.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Lei Liu, Yanliang Wang, Shengda Guo, Fei Yu, Huang Cai, Hao Chen, Rui Bao
Summary: The effects of Y2O3 and Cr3C2 additives on the microstructure and properties of WC-9Co-1Ni cemented carbide were investigated. The additives reduced the grain size of WC, increased the hardness and rupture strength, and improved wear resistance and corrosion resistance.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Physical
X. Q. Han, N. Lin, X. C. Zhang, W. J. Zhang, Z. Y. Wang, C. Ma
Summary: An innovative approach was proposed to recycle WC-Co-Ni cemented carbides by synthesizing bimetallic cobalt-nickel phosphides on the waste substrate. The bimetallic phosphides exhibited excellent activities, with the optimal Ni content of 50 wt% in the binder phase. The uniformly distributed CoNiP catalyst on the Co-Ni skeleton demonstrated the highest catalytic activity due to the synergistic interaction among the exposed phosphide sites, enhanced mass transfer pathways, and reduced energy barrier.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Tomas Soria Biurrun, Jazmina Navarrete Cuadrado, Unai Galech Napal, Belen Lopez Ezquerra, Lorena Lozada Cabezas, Jose M. Sanchez Moreno
Summary: Cemented carbides processed from WC-Ni-Co-Cr3C2-TiAl3 powder mixtures by HIP after sintering exhibit a homogeneous precipitation of gamma prime and other reaction products in their metallic binder phases. The amount of alumina and gamma prime phases present in the sintered materials depends on the oxygen content of the powder mixtures, while the refinement of gamma prime precipitates is critically dependent on the cooling rate after HIPing.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
J. H. Huang, S. G. Huang, P. Zhou, B. Lauwers, J. Qian, J. Vleugels
Summary: The influence of up to 15 vol% WC or Mo2C addition on Ni bonded NbC matrix cermets was assessed in this study. Thermodynamic modelling, microstructure and phase analysis were used to study the constituent phases and dissolution of W/Mo in the binder and NbC phases. The study discussed the phase evolution, solid solution formation, and evaluated fracture toughness, Vickers hardness, and transverse rupture strength.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Tomas Soria, Belen Lopez, Lorena Lozada, Steven Moseley, Patricia Alveen, Marc Elsen, Andrea Mueller-Grunz, Michael Magin, Ralph Useldinger, Jose M. Sanchez
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
Tomas Soria Biurrun, Belen Lopez Ezquerra, Lorena Lozada Cabezas, Jose M. Sanchez Moreno
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2020)
Article
Metallurgy & Metallurgical Engineering
L. Vazquez, N. Rodriguez, I Rodriguez, E. Alberdi, P. Alvarez
WELDING IN THE WORLD
(2020)
Article
Chemistry, Physical
Parastoo Jamshidi, Miren Aristizabal, Weihuan Kong, Victor Villapun, Sophie C. Cox, Liam M. Grover, Moataz M. Attallah
Article
Materials Science, Multidisciplinary
Tomas Soria Biurrun, Jazmina Navarrete Cuadrado, Unai Galech Napal, Belen Lopez Ezquerra, Lorena Lozada Cabezas, Jose M. Sanchez Moreno
Summary: Cemented carbides processed from WC-Ni-Co-Cr3C2-TiAl3 powder mixtures by HIP after sintering exhibit a homogeneous precipitation of gamma prime and other reaction products in their metallic binder phases. The amount of alumina and gamma prime phases present in the sintered materials depends on the oxygen content of the powder mixtures, while the refinement of gamma prime precipitates is critically dependent on the cooling rate after HIPing.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Automation & Control Systems
Amaia Jimenez, Miguel Arizmendi, Jose Manuel Sanchez
Summary: The paper introduces an experimental method for predicting tool wear in drilling Inconel 718 superalloy by analyzing drilling force signals and tool wear progress. The study shows that mean value of thrust force and standard deviation of high frequency components are the most sensitive indicators for drill wear.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Roberto Gonzalez-Ojeda, Octavio Lozada-Flores, Gonzalo Gonzalez-Reyes, Jose Manuel Sanchez-Moreno
Summary: The study analyzed the influence of alloying elements such as Cr, Mo, and Mn on low-alloy 8620 steel during hot forging, revealing that the small austenite grain size allows for subsequent modification by surface hardening procedures. The alloying element percentages were significantly modified during precipitation, with segregation potentially responsible for inhibiting grain growth with short-term nanometric precipitates.
Article
Materials Science, Multidisciplinary
Lexuri Vazquez, Maria Nieves Rodriguez, Iker Rodriguez, Pedro Alvarez
Summary: The study investigates the CMT-based wire and arc additive manufacturing of Ti-6Al-4V alloy for manufacturing walls with two building strategies, focusing on the influence of thermal treatments on microstructure and mechanical properties. Microstructural analysis revealed different growth grades of lamellae alpha phase after thermal treatments at various temperatures, leading to improved strength and ductility balance compared to the as-built condition. At 920 degrees C, anisotropy was maintained with a 70% increase in elongation and a slight decrease in yield strength and UTS.
Article
Automation & Control Systems
Aitor Zalakain-Azpiroz, Nieves Rodriguez, Aitor Garcia de la Yedra, Joaquin Piccini, Xabier Angulo-Vinuesa
Summary: Monitoring and assessing weld quality in industrial robotic arc welding processes is crucial to ensure the suitability of components for their intended applications, with weld penetration depth being a major fabrication requirement. Multiple sensor approaches have been developed to overcome physical challenges and accessibility restrictions, enabling instantaneous depth evaluation and online usage.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Tomas Soria-Biurrun, Jazmina Navarrete-Cuadrado, Lorena Lozada-Cabezas, Federico Ibarreta-Lopez, Roberto Martinez-Pampliega, Jose M. Sanchez-Moreno
Summary: The hardness and fracture strength of WC-Ni-Co-Cr-Ti-Al cemented carbides can be modified through treatments, with optimized aluminum additions leading to improved mechanical properties. Fe-Ni-Co-Cr alloys may also be potential candidates for partial substitution of Co content in WC-based hardmetals, showing comparable fracture strength values to standard WC-Co grades.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Tomas Soria-Biurrun, Jose M. Sanchez-Moreno, Karin Frisk
Summary: The liquid phase formation temperatures of the quinary system W-C-Co-Fe-Ni with a ratio of Fe:Co:Ni = 40:20:40 were determined using DSC analysis with an accurately defined experimental C-window of this system with binder content of 14.3 +/- 2 wt%. Thermodynamic modelling was carried out using the CALPHAD approach and temperature-composition sections of the system with different binder contents were calculated to verify the rationality of the modelling. A good correlation between experimental and calculated results was observed, indicating that the experimental data can be well reproduced by the present modelling.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Chemistry, Physical
Unai Galech Napal, Miren Aristizabal Segarra, Borja Elguezabal Lazcano, Antonio Sivo, Inigo Iturriza Zubillaga
Summary: Astroloy, a Ni-based superalloy, is suitable for powder metallurgy manufacturing processes. The cooling rate and heat treatment process can be optimized to improve the microstructure and mechanical properties of Astroloy.
Article
Engineering, Manufacturing
R. Escribano-Garcia, N. Rodriguez, O. Zubiri, J. Piccini, I Setien
Summary: This work presents a fast methodology to adjust heat source model parameters that reproduce the evolution of temperatures and distortions of a welded joint. The proposed methodology combines Response Surface Method (RSM) and Finite Element Method (FEM) to simulate and predict thermal and mechanical behavior. This method replaces the trial and error process and saves engineering time.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Engineering, Multidisciplinary
Aizpea Urresti-Ubillos, Jon Inaki-Arrizubieta-Arrate, Oihane Murua-DelaMata, Miren Aristizabal, Eneko Ukar, David Lopez-Bolanos
Summary: The aim of this research is to characterize the 15CDV6 powder material for Laser Directed Energy Deposition (LDED) processes. The novelty of this work lies in the fact that this aeronautical steel has never been used before in powder LDED process. The 15CDV6 steel powder was atomized specifically for this study to ensure its quality, and its chemical composition and particle shape were measured. The suitability of the 15CDV6 steel for L-DED process was studied through single bead tests, overlapping beads deposition, and thin wall construction, with the results of each sequence serving as the basis for the next.
Article
Materials Science, Multidisciplinary
T. Soria-Biurrun, L. Lozada-Cabezas, F. Ibarreta-Lopez, R. Martinez-Pampliega, J. M. Sanchez-Moreno
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
Ziyan Zhao, Kaiyue Zheng, Xianghui Yu, Qian Qi, Lujie Wang, Yan Liu
Summary: In-situ TiC/Ni composites with Ta element were fabricated by reactive sintering. It was found that Ta element could reduce the oxidation rate and decrease the content of TiO2 and NiTiO3 in the oxide scale, thereby optimizing the oxidation resistance and electrical conductivity of the composites.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Kai Wang, Mingyuan Ma, Yingchun Diao, Qijun Huang, Xiangkui Zhou, Guojian Li, Qiang Wang
Summary: The relationship between the V(C, N) content and the thickness of the gradient layer in nanocrystalline cemented carbides was investigated. The introduction of V(C, N) was found to enhance the mechanical properties of these materials.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Claudio Bertalan, Steven Moseley, Leonel Pereira, Ralph Useldinger
Summary: The influence of sintering temperature, dwelling time at maximum temperature and carbon content on the microstructure and mechanical and magnetic properties of WC-6%Co hardmetal was investigated. Results showed that to maximize hardness and transverse rupture strength (TRS), sintering should be performed at a low temperature (< 1400°C) and with a dwelling time of at least 75 minutes. This is particularly important for low carbon parts to ensure the necessary microstructure homogeneity required for high TRS.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Longlong Sun, Hang Li, Ningxin Wei, Jianliang Li, Jiewen Huang, Jian Kong, Qiujie Wu, Yan Shi, Dangsheng Xiong
Summary: By regulating the microstructure of TaBx films deposited by magnetron sputtering, the hardness and wear resistance of the films can be improved. With the increase of the bias voltage, the B content decreases and the crystallinity is enhanced. The microstructure of the films transforms from fibrous to dense columnar and then to granular structure. At a bias voltage of -180 V, the films exhibit super high hardness and relatively moderate fracture toughness.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Liang Xia, Kai Liu, Yucheng Cao, Chao Jiang
Summary: This study investigates the microstructure information and mechanical behavior of ion-irradiated zirconium alloys through experimental measurements and theoretical analysis. Experimental procedures involve Au3+ irradiation of specific alloys, and transmission electron microscopy analysis reveals the formation of precipitates and their transformation after ion-irradiation. Macroscopic mechanical properties are characterized by nano-indentation tests, revealing significant indentation size effect and irradiation hardening behavior. A mechanistic model is developed to explain the depth-dependent hardness observed in ion-irradiated zirconium alloys.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Jiangtao Zhang, Guoqin Huang, Yangli Xu, Jianyu Wang, Guangyao Han, Yuanqiang Tan
Summary: Selective laser melting (SLM) provides a novel method for the integrated production of structural and functional metal-matrix diamond composites in the field of diamond tools. In this study, a discrete element method model is developed to simulate the spreading process of diamond/CuSn composite powders. The findings reveal that adjusting the physical properties of diamond particles and process parameters can improve the powder bed quality and particle dynamics, leading to better performance of diamond tools.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Roman Gabor, Ladislav Cvrcek, Karel Masek, Josef Hlinka, Oldrich Motyka, Jan Walter, Grazyna Simha Martynkova, Gabriela Mikeskova, Jana Seidlerova
Summary: This study investigated the surface modification of β-Ti39Nb alloy using micro-arc oxidation technique, and examined the relationships between surface chemical composition, morphology, and tribological and corrosion properties. The results showed that the technique improved the wear resistance of the alloy, and the particle analysis confirmed the correlation between particle composition and tribological parameters.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Benedetto Bozzini, Matteo Amati, Luca Gregoratti, Majid Kazemian, Francesco Tavola, Sandra Tedeschi, Gian Pietro De Gaudenzi
Summary: In this study, the composition and chemical state of the surface of hardmetal subjected to controlled electrochemical corrosion were analyzed using synchrotron-based scanning photoelectron microscopy and photoelectron microspectroscopy. The results showed that corrosion under different conditions led to surface enrichment and leaching of different chemical elements and species.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
B. Roebuck, M. G. Gee, K. P. Mingard, H. G. Jones, H. Zhang, V. Tong
Summary: Metrology provides scientific support for the practical use of testing standards and helps establish a common language for different users regarding material capabilities. The hardmetal industry already has numerous international standards, but there is still room for improvement in certain testing strategies. The Materials Group at the National Physical Laboratory in the UK focuses on metrology and has highlighted specific metrological issues that need further attention. These include high hardness measurements, dislocation analysis, micro-tribology, nanoindentation, and structural characterization.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Suyeon Kim, Taehyun Kwon, Seulgi Kim, Sung Ho Song, Dongju Lee
Summary: This study examines the effect of two different methods, oxide reduction and mechanical alloying, on the sintering behavior and microstructure of molybdenum-tungsten sintered compacts. The sintered compacts produced with oxide-reduced nanopowders exhibit higher density, purity, and a finer microstructure, making them more suitable for sputtering targets.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
A. M. Ferro Rocha, A. M. Santos, R. Mineiro, P. Pereira, J. Sacramento, A. M. R. Senos, A. C. Bastos
Summary: This study compares the corrosion resistance of different hardmetal composites and their binders in a corrosive environment. Through electrochemical testing methods, the corrosion behavior of these materials was studied, and the influence of the binder's electrochemical behavior on the corrosion resistance of hardmetal was explored.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Bo Li, Yong Zheng, Wangwang Wang, Hao Wu, Yufan Li, Jin Lv
Summary: The effects of various Cr doping amounts on the microstructure and properties of Mo2FeB2-based cermets were investigated using EDS, SEM, and TEM. The results showed that moderate Cr doping enhanced the system's wettability, fracture toughness, and transverse rupture strength, while excessive Cr addition decreased mechanical properties. The solid-solution of Cr in the hard phase had the most pronounced effect on the mechanical properties of the cermets.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Min Lian, Fei Wang, Kaixuan Rong, Xiaoci Ma, Hetian Liu, Xinmiao Gai, Yufei Ge, Shushan Dong, Qiang Tao, Pinwen Zhu
Summary: This study successfully optimized the toughness of polycrystalline diamond (PCD) by adjusting the intergranular fracture (IF) and transgranular fracture (TF) modes. The results showed that a mixture of the IF and TF modes resulted in higher hardness and toughness in PCD compared to a single fracture mode. The toughness of the PCD was approximately three times that of single-crystal diamonds and comparable to that of pure nanotwinned diamonds. The mixed modes introduced toughening mechanisms such as high frequency large crack deflection, crack bridging, pull-out, and crack branching, which increased the toughness of the PCD.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Ruifang Wang, Xiang Zhan, Yongqiang Chen, Chao Zhang, Yusi Che, Jilin He
Summary: The particle size and morphology of tungsten powders play a crucial role in determining the processing properties of tungsten products. This study investigated the effects of water vapor partial pressure on the hydrogen reduction of tungsten oxides, and proposed a method of changing the particle size of tungsten powders using bottom blowing hydrogen. The experimental results showed that bottom-blowing hydrogen could improve the uniformity of tungsten powders in a crucible by eliminating discrepancies in water vapor partial pressure. The partial pressure of water vapor increased with the temperature of the water bath, leading to an increase in the average particle size of tungsten powders.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Oladapo Eso, Xu Wang, Samuel Wolf, Travis Puzz
Summary: In recent decades, there has been an increasing trend in incorporating alloying additives into WC-Co hardmetals for property enhancement. This paper establishes correlations between properties and microstructure of binder modified WC-Co compositions, and explains the observed property correlations.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
