Article
Nanoscience & Nanotechnology
Hideaki Nishikawa, Yoshiyuki Furuya, Houichi Kitano, Terumi Nakamura, Kosuke Kuwabara, Yoshiharu Kanegae, Dong-Soo Kang, Kinya Aota
Summary: In this study, the microscopic fatigue crack initiation and growth behavior of rolled plate and additively-manufactured nickel base 718 alloy were observed. It was found that the specimens with a robust (001) texture, prepared using EBM and EBAM methods, had shorter fatigue lives compared to the rolled plate and SLM specimens. The early stage cracks were found to initiate and grow along the {111} slip plane, and in the EBAM specimens, the cracks propagated straight to an adjacent grain due to their (001) texture.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Laura Cordova, Ahmad Raza, Eduard Hryha
Summary: Powder reuse in powder-bed-fusion electron beams (PBF-EB) has both positive and negative effects, improving flowability but deteriorating charging behavior, leading to increased observation of ejected particles.
Article
Materials Science, Multidisciplinary
Min Zheng, Lei Wei, Jing Chen, Qiang Zhang, Guohao Zhang, Xin Lin, Weidong Huang
Summary: This study investigated the development of surface features of Inconel 718 samples fabricated by selective laser melting under different laser powers and scanning speeds. The surface tension was identified as a key factor in the SLM process, pulling melted powder into the molten pool and affecting surface morphology.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Sunny Sharma, Karthik Palaniappan, Vagish D. Mishra, Srikanth Vedantam, H. Murthy, Balkrishna C. Rao
Summary: This study investigated the microstructural evolution and mechanical properties of the Ni-based superalloy Inconel (R) 718 fabricated by powder-based laser fusion process. The characterization involved X-ray diffraction, optical, and scanning electron microscopy. The results showed that solution heat treatment effectively reduced detrimental Laves phases and relieved thermal residual stresses caused by non-homogeneous recrystallization. This research is significant for understanding the improvement of structural properties in Ni-based superalloys.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Xiaogang You, Yi Tan, Hongyang Cui, Huixing Zhang, Xinpeng Zhuang, Longhai Zhao, Shaoqiang Niu, Yi Li, Pengting Li
Summary: The new electron beam smelting technology was used to prepare Inconel 718 alloy and investigate the microstructure evolution and nucleation and coarsening mechanisms of the gamma', gamma'', and delta phases. Good microstructure stability of the alloy was observed at 700 degrees C, with refinement of microstructures achieved. Nucleation and coarsening mechanisms of various phases were found to be influenced by temperature and dislocation arrangements.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Tom Sanviemvongsak, Daniel Monceau, Martin Madelain, Clara Desgranges, James Smialek, Bruno Macquaire
Summary: The study compared the cyclic oxidation resistance at 900 degrees C of the alloy 718 produced by laser beam melting and electron beam melting with that of the wrought-718 alloy, revealing significant differences in the rate of oxide layer spallation and the adhesion of the oxide scale. Standard heat treatment and surface grinding may slightly delay the catastrophic spallation. Additionally, the quantitative discussion on the role of sulfur and manganese on the adhesion of the oxide scale was conducted using thermodynamic modelling.
Article
Engineering, Multidisciplinary
Shuya Zhang, Lilin Wang, Xin Lin, Haiou Yang, Weidong Huang
Summary: This study explains the unexpected increase of Laves phase in Inconel 718 manufactured by selective laser melting (SLM) and clarifies its distinct dissolution behavior during heat treatment through a comparative analysis. SLM-built IN718 has a higher cooling rate, resulting in more trapped Nb atoms in the matrix and fewer inter-dendritic Laves phases. The dissolution of Laves phase during homogenization treatment is controlled by three-dimensional diffusion and interface reaction processes.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Sumit K. Sharma, K. Biswas, J. Dutta Majumdar
Summary: This study aims to investigate the microstructure, residual stress, and microhardness of electron beam surface remelted Inconel 718 alloy. The study found that surface remelting leads to significant microstructural refinement and improvement in hardness, and optimizing process parameters can further enhance performance.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Longhai Zhao, Yi Tan, Yilin Wang, Xiaogang You, Kai Chang, Xinpeng Zhuang, Pengting Li, Yebing Hu
Summary: The homogenization behavior of IN 718 superalloy prepared by electron beam layered solidification at 1150 degrees C has been studied. The results show that microsegregation was eliminated after homogenization for 8 h at 1150 degrees C, with D-Nb and D-Ti calculated at approximately 3.8 x 10(-11) cm(2)/s and 4.0 x 10(-11) cm(2)/s, respectively. The completion time of homogenization at a certain temperature depends on the degree of segregation, the distance between secondary dendrite arms, and the content of Nb.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Hugo Tupac-Yupanqui, Amir Armani
Summary: This study focused on manufacturing and characterizing geometrically complex functional parts using recycled Inconel 718 material. By optimizing printing parameters and studying mechanical properties, it was shown that recycled material can be used to additively manufacture high-quality components.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Green & Sustainable Science & Technology
Niraj Kumar, Prakash Kumar, Rajat Upadhyaya, Sanjeev Kumar, Chandan Panday
Summary: This study investigates the dissimilar autogenous laser beam welding between Inconel 718 and Austenitic Stainless Steel 304L. Microstructural analysis reveals the presence of laves phases in the weld zone, as well as heterogeneous microstructural formation. Optical images show mixed dendrites in the weld zone and fusion zones. Energy-dispersive spectroscopy results indicate the presence of segregated elements at the weld center. Mechanical testing demonstrates brittle failure in the impact test of the weld zone. Based on the microstructure and mechanical results, the LBW dissimilar weld between Inconel 718 and ASS 304L is qualified for safe use in high-temperature end applications.
Article
Chemistry, Physical
Evgenii Borisov, Anatoly Popovich, Vadim Sufiiarov
Summary: This paper presents the possibility of modifying the properties of Inconel 718 alloy by adding Yttrium in situ during the selective laser melting process. The study found that with an increase in the proportion of yttrium in the alloy, the hardness increases, but the yield strength and tensile strength decrease while the relative elongation increases. Further increase in yttrium content leads to a sharp decrease in the relative elongation and an increase in the yield strength.
Article
Materials Science, Multidisciplinary
Do Sung Lee, Jung-Min Oh, Jun-Ho Seo, Jae-Won Lim
Summary: The study investigated the high-temperature melting and impurity removal process of Inconel 718 using hydrogen plasma arc melting (HPAM). The HPAM successfully decreased the concentrations of oxygen, nitrogen, and metallic impurities in the Inconel 718 scraps, producing refined ingots that met commercial standards. Additionally, the microstructure of the as-cast Inconel 718 varied depending on different parts of the ingots due to varying cooling rates.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Multidisciplinary Sciences
Chaitanya Gullipalli, Prayag Burad, Nikhil Thawari, Jatin Bhatt, T. V. K. Gupta
Summary: This study investigates the microstructure evolution in multilayer Inconel 718 (IN718) superalloy deposited by laser-aided direct energy deposition using SEM. The results reveal dendritic morphology with long columnar grains at the bottom and middle regions, and equiaxed structures at the top deposited region. Additionally, severe elemental segregation and Nb-rich Laves phase formation were observed in the IN718 microstructure, with an increase in Nb segregation at the top region and a decreasing trend in microhardness with the increment in layers.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Automation & Control Systems
Akash Sali, Vivek Patel, James Hyder, David Hyder, Mike Corliss, Wayne Hung
Summary: This paper explores the feasibility of welding Inconel 718 (IN718) and compares the quality of electron beam welded samples produced by hot rolling and laser powder bed fusing (L-PBF). The results show that both the yield and tensile strength of the welded L-PBF materials exceeded those of rolled materials and met the minimum requirement from ASTM specification. However, the ductility of the welded L-PBF material did not.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Mechanical
M. Kahlin, H. Ansell, J. Moverare
Summary: This study compares the fatigue crack growth rates for different crack configurations and finds that the data obtained with CT-specimens are relevant for general damage tolerance predictions.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Luqing Cui, Fuqing Jiang, Ru Lin Peng, Reza Taherzadeh Mousavian, Zhiqing Yang, Johan Moverare
Summary: The fatigue properties and microstructural evolution of 316L stainless steel manufactured by laser powder bed fusion were studied and compared with the wrought counterpart. The as-built L-PBF 316LSS exhibited a unique microstructure with high serrated grain boundaries, bimodal grain structure, nano-precipitates, solidification cell structures, and chemical segregations. The hardness and fatigue resistance of L-PBF 316LSS were significantly improved compared to the wrought solution annealed samples due to its unique microstructural characteristics and enhanced planar slip.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Luqing Cui, Cheng-Han Yu, Shuang Jiang, Xiaoyu Sun, Ru Lin Peng, Jan-Erik Lundgren, Johan Moverare
Summary: The study introduces a new method based on the indentation size effect and strengthening theories to measure dislocation density. It reveals that the distribution of dislocations in L-PBF HX is grain orientation-dependent, and the strengthening effect is mainly attributed to edge-GNDs.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Hugo Warner, Guocai Chai, Johan Moverare, Mattias Calmunger
Summary: This study investigates the thermomechanical fatigue behavior of two austenitic stainless steels at high temperatures. The results show that Sanicro 25 exhibits a shorter TMF life under aging conditions, while Esshete 1250 experiences reduced structural stability and cyclic deformation resistance after aging.
Article
Materials Science, Multidisciplinary
Prabhat Pant, Filomena Salvemini, Sebastian Proper, Vladimir Luzin, Kjell Simonsson, Soren Sjostrom, Seyed Hosseini, Ru Lin Peng, Johan Moverare
Summary: Process parameters in laser-based powder bed fusion (LBPF) have a significant impact on part quality. This study investigated the influence of different scan strategies on the properties of complex L-shape parts made from Inconel 718 alloy. The results showed that the re-melting strategy could significantly reduce surface residual stress, while the sectional scanning strategies resulted in porosities at the interfaces.
MATERIALS & DESIGN
(2022)
Article
Engineering, Mechanical
Zhicheng Ge, Guang Xie, Mikael Segersall, Viktor Norman, Zhe Chen, Johan Moverare, Langhong Lou, Jian Zhang
Summary: The deformation mechanisms of a single crystal nickel-base superalloy with and without Ru-doped have been investigated under out-of-phase thermomechanical fatigue. It was found that the Ru-doped alloy exhibits a longer thermomechanical fatigue life and different deformation mechanisms compared to the Ru-free alloy.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Luqing Cui, Dunyong Deng, Fuqing Jiang, Ru Lin Peng, Tongzheng Xin, Reza Taherzadeh Mousavian, Zhiqing Yang, Johan Moverare
Summary: This study investigates the influence of microstructure characteristics on low cycle fatigue properties and strengthening effects in additively manufactured stainless steel. It reveals that the presence of cell structures significantly increases the fatigue life by inhibiting dislocation propagation and promoting the formation of nanotwins. Additionally, compositional micro-segregation serves as another important strengthening mechanism. The findings highlight the potential of additive manufacturing in designing high-performance energy absorbent alloys through tailored microstructure.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Shuang Jiang, Ru Lin Peng, Kristian Mathis, Hai-Le Yan, Gergely Farkas, Zoltan Hegedues, Ulrich Lienert, Johan Moverare, Xiang Zhao, Liang Zuo, Nan Jia, Yan-Dong Wang
Summary: Shear bands in metallic materials, especially those with hexagonal-close-packed (hcp) constituents, typically result in non-uniform plastic deformation. This study proposes a counterintuitive design strategy that tolerates shear bands with localized strains, known as the shear banded laminar (SBL) structure, which promotes ( c + a ) dislocation activation in hcp metals and achieves unprecedented strength and ductility combination in hcp-metal-based composites.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Jialiang Chen, Jinghao Xu, Mikael Segersaell, Eduard Hryha, Ru Lin Peng, Johan Moverare
Summary: This study investigated the effects of powder reuse on the mechanical performance of a nickel-based superalloy. It was found that metallic oxides with increased oxygen content were present on the surface of the reused powders. Negligible deterioration in strength and tensile ductility was observed, while there was some scatter in fatigue performance with regard to fatigue life. Deformation and fatigue crack propagation mechanisms were discussed to describe the effects of powder degradation.
Article
Materials Science, Multidisciplinary
Xiaoyu Sun, Pimin Zhang, Johan Moverare, Xin-Hai Li, Luqing Cui, Ru Lin Peng
Summary: The addition of Ta in MCrAlY coatings improves the oxidation resistance and reduces the depletion of γ' phase in the substrate. Thermodynamic simulations reveal the phase-transformation mechanism induced by initial interdiffusion and uncover the mechanism behind the improved resistance to γ' depletion by Ta addition.
MATERIALS & DESIGN
(2023)
Article
Metallurgy & Metallurgical Engineering
Camille Pauzon, Ahmad Raza, Imran Hanif, Sophie Dubiez-Le Goff, Johan Moverare, Eduard Hryha
Summary: Increasing the layer thickness from 30 to 60 μm in laser powder bed fusion can improve productivity, but it also leads to process instability, spatter generation, and powder degradation, especially for oxygen-sensitive alloys. This study investigates the effect of increasing layer thickness on Ti-6Al-4V spatter formation during LPBF, and finds that the spatters are covered with a uniform Ti-Al-based oxide layer and Al-rich oxide particulates, with a thickness about twice that of the virgin powder. The oxygen content in the spatters is about 60% higher compared to the virgin powder. The research suggests that increasing the layer thickness to 60 μm can reduce the total generation of spatters by approximately 40% while maintaining similar spatter characteristics and static tensile properties, allowing for an increased build rate without compromising process robustness.
Review
Materials Science, Multidisciplinary
Esmaeil Sadeghi, Paria Karimi, Reza Esmaeilizadeh, Filippo Berto, Shuai Shao, Johan Moverare, Ehsan Toyserkani, Nima Shamsaei
Summary: This paper comprehensively reviews the fundamentals and recent advances in the PBF-built Alloy 718 parts with improved fatigue life, including the influence of thermal and mechanical post-treatment, mechanisms of fatigue crack initiation and growth, thermo-mechanical fatigue, dwell-time fatigue, as well as fracture behavior in different loading conditions and environments considering anisotropic characteristics of the material. An unbiased review of the literature provides an understanding of the advanced and outstanding achievements in the field that assure further research. An evaluation of the status of the field, the gaps in the theoretical understanding, and the fundamental needs for the sustainable development of PBF-built Alloy 718 with enhanced fatigue life in specific applications are also provided.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Freddy Leijon, Johan Moverare
Summary: The importance of recycling and additive manufacturing (AM) is growing, but there has been limited focus on developing recyclable AM alloys compatible with larger scrap loops of aluminum alloys. This study examines the printability of AlMgSi alloys in the range of 0-30 wt% Mg and 0-4 wt% Si using a high-throughput method. Results show that AlMgSi alloys can be printed in two composition ranges: Si + Mg < 0.7 wt% or Si + 2/3 Mg > 4 wt% when Mg < 3 wt% and Si > 3 wt%. Increasing Mg and Si content affects the grain structure and hardness of the alloys.
Article
Engineering, Mechanical
Stefan B. Lindstrom, Johan Moverare, Jinghao Xu, Daniel Leidermark, Robert Eriksson, Hans Ansell, Zlatan Kapidzic
Summary: The study employs the Ottosen-Stenstrom-Ristinmaa (OSR) incremental fatigue damage model for assessing the fatigue life of integral airframes made from 7050-T7451 aluminum plates. Validation is done through variable-amplitude high-cycle fatigue experiments conducted on circumferentially notched axisymmetric specimens and a geometry resembling an aircraft fuselage frame with flanges, stiffeners, and web panels. The paper also discusses the modification of OSR model parameters to account for surface roughness and acceptable failure probability.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Luqing Cui, Dunyong Deng, Shuang Jiang, Ru Lin Peng, Tongzheng Xin, Honghong Zhang, Zoltan Hegedues, Ulrich Lienert, Weifeng He, Johan Moverare
Summary: This study reveals the mechanisms underlying the anisotropic ductility of AM alloys and provides insights into strategies for enhancing their performance.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
