Review
Materials Science, Multidisciplinary
Nadezhda Dudova
Summary: This paper provides an overview of the creep strength and microstructural features of 9% Cr and 10-12% Cr martensitic steels with high B and low N contents, achieved through modifying the chemical composition. The optimal B/N ratio in steels is discussed, and the creep properties are compared with those of traditional B and N content steels. The relationship between the stability of lath structure and precipitates and the creep strength of steels is also explored, along with future prospects of this alloying modification.
Article
Nanoscience & Nanotechnology
A. Weidner, K. Fischer, H. Biermann
Summary: The study investigated the mechanical behavior, microstructure, and texture development of ultrafine-grained austenitic TRIP steels with different austenite stabilities. Through thermo-mechanical processing, a significant increase in yield strength was achieved due to the ultrafine-grained microstructure. The observed Lueders band phenomenon and texture evolution provide insights into the deformation behavior of these steels.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Guosheng Sun, Jizi Liu, Yuntian Zhu
Summary: By introducing a bi-modal heterostructure, Luders deformation in UFG 304 stainless steel can be effectively suppressed, leading to improved ductility and toughness without sacrificing strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Review
Materials Science, Multidisciplinary
Pavel Dolzhenko, Marina Tikhonova, Marina Odnobokova, Rustam Kaibyshev, Andrey Belyakov
Summary: The aim of this review is to summarize recent achievements in the development of ultrafine-grained austenitic/ferritic stainless steels through large strain deformation. The paper discusses various methods of large strain deformation for producing ultrafine-grained metallic materials. It also explores the structural mechanisms responsible for grain refinement during plastic deformation and examines the physical and mechanical properties of ultrafine-grained stainless steels. The review concludes that the development of ultrafine-grained microstructures during severe plastic deformation is a result of continuous dynamic recrystallization, with the misorientations among strain-induced cells/subgrains progressively increasing.
Article
Materials Science, Multidisciplinary
Genqi Tian, Bo Mao, Yuantao Xu, Liming Fu, Zuogui Zhang, Yanfeng Wang, Aidang Shan
Summary: High-temperature strength and microstructure stability in heat-resistant steels are major concerns. Understanding microstructure evolution and mechanical property degradation during creep exposure is important for safety operations. This study conducted interrupted creep tests on 9% Cr steels at 873 K and studied the degradation of mechanical properties and microstructure evolution. The results provided insights into the mechanisms of degradation and stability of these steels.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Yumeng Tan, Xiaowei Wang, Zitong Kang, Fei Ye, Yefeng Chen, Dewen Zhou, Xiancheng Zhang, Jianming Gong
Summary: Creep lifetime prediction is critical for high-temperature component design, but achieving high accuracy is challenging due to various influencing factors. In this study, machine learning models were utilized to predict creep lifetime by considering variables such as material chemical compositions, heat treatment conditions, and creep test conditions. A model coupled with the Larson-Miller parameter demonstrated the best prediction performance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Jakub Veverka, Frantisek Lukac, Andrzej P. Kadzielawa, Martin Koller, Zdenek Chlup, Hynek Hadraba, Miroslav Karlik, Dominik Legut, Jirina Vontorova, Tomas Chraska, Monika Vilemova
Summary: The application of non-equilibrium methods such as Mechanical Alloying and Field Assisted Sintering enables the formation of a single solid solution in immiscible systems. Using W-Cr solid solution as an intermediate step, ultrafine-grained composite alloys with rod-like microstructural features can be produced, leading to a significant increase in strength without an increase in hardness.
Article
Materials Science, Multidisciplinary
Igor Velkavrh, Joeel Voyer, Fevzi Kafexhiu, Bojan Podgornik
Summary: Coarsening of precipitates in 9-12 wt.% Cr steels significantly influences their creep, friction, and wear behaviors after aging, with the number and size of precipitates playing a crucial role in determining the mechanical properties of the steels. The study shows that prior to aging, the steel matrix morphology governs the creep rate and tribological performance, while after aging, the combination of the number and size of precipitates becomes an additional factor in determining the mechanical properties of the steels.
Article
Engineering, Mechanical
Pei-Shan Ding, Xiao-Tao Zheng
Summary: The creep-ratcheting behavior of advanced 9-12 % Cr ferritic steel at 600 degrees C under different peak holding times was investigated, and a corresponding creep-ratcheting constitutive model was developed. Results showed that the anelastic strain remains relatively constant for different holding times, but decreases rapidly during the last several cycles. Moreover, the study observed the behavior of primary creep regeneration during repeated loading and unloading, which remains almost the same with increasing number of cycles.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Chemistry, Multidisciplinary
Osman El-Atwani, Hyosim Kim, Jonathan G. Gigax, Cayla Harvey, Berk Aytuna, Mert Efe, Stuart A. Maloy
Summary: This study utilized large strain machining to manufacture nanostructured HT-9 steel with enhanced thermal stability and mechanical properties, demonstrating through in-situ transmission electron microscopy the thermal stability and the possibility of tuning material strength and ductility. The results suggest the potential of producing controlled nanocrystalline materials through a scalable and cost-effective method, with a need for further understanding of the morphology dependence on machining conditions.
Article
Metallurgy & Metallurgical Engineering
M. Odnobokova, A. N. Belyakov, N. A. Enikeev, P. O. Kaibyshev
Summary: The study found that the ultrafine structure in stainless steels is formed through strain twinning and microshear bands during low-temperature rolling. After annealing, continuous recrystallization and grain growth occur. Steel 316L shows higher stability to grain growth compared to steel 304L, especially during annealing.
PHYSICS OF METALS AND METALLOGRAPHY
(2021)
Article
Materials Science, Coatings & Films
Hui Zhang, Yunpeng Liu, Xue Bai, Wei Zhao, Peirong Zhang, Wei-Feng Rao
Summary: The study successfully obtained highly corrosion-resistant Fe-based cladding layers with in-situ nano vanadium carbides through the use of pulsed laser and graded particle-size alloy powders. The resulting ultrafine-grained layer exhibited high hardness and corrosion resistance.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Mechanics
Yanyan Huang, Xiaowu Luo, Yucun Zhan, Yan Chen, Liping Yu, Wei Feng, Jiankun Xiong, Jianping Yang, Guijun Mao, Lin Yang, Fuheng Nie
Summary: This study investigates the creep rupture behavior and microstructure changes of dissimilar welded joints of two types of martensitic heat resistant steel: F92 and Co3W2. The results indicate that the fracture position and mode change from transgranular ductile fracture in parent F92 to intergranular brittle fracture in the fine grain heat affected zone near F92, with the decrease of applied stress. The study also reveals the microstructural degradation caused by creep, including the decrease in dislocation density, precipitates coarsening, formation of dislocation cells, microvoids, macroscopic secondary cracks, and changes in fracture surface morphology.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Nanoscience & Nanotechnology
Xueyun Gao, Haiyan Wang, Cainv Ma, Meng Lv, Gang Sha, Yiming Li, Huiping Ren
Summary: In this study, low carbon dual phase steels with ultrafine grains and nanoscale copper rich precipitates were produced by a combination of warm deformation and isothermal aging processes. The results indicate that the formation and compositional evolution of the Cu-rich particles are associated with the mixing enthalpy of alloying elements and the attractive interaction between the solute atoms.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
A. Fedoseeva, E. Tkachev, R. Kaibyshev
Summary: The creep behavior of 9% Cr martensitic steels with different W, N, and B contents was studied at 650 degrees C. The results showed a breakdown in creep strength and a change in apparent stress exponent at applied stresses ranging from 140 to 120 MPa. The threshold stresses, estimated by extrapolation, decreased at the transition from high stress to low stress regions. The sources of these threshold stresses were believed to be dislocations, carbides, and phase particles.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Zenji Horita, Daisuke Maruno, Yukimasa Ikeda, Takahiro Masuda, Yongpeng Tang, Makoto Arita, Yuji Higo, Yoshinori Tange, Yasuo Ohishi
Summary: This study applied severe plastic deformation through high-pressure sliding on pure Ti to examine the allotropic transformation. It was found that straining by high-pressure sliding processing was effective in promoting phase transformation and maintaining the transformed phase, while the reverse transformation from omega phase to alpha phase is controlled by thermal energy.
MATERIALS TRANSACTIONS
(2021)
Article
Materials Science, Multidisciplinary
Marie Kvapilova, Petr Kral, Jiri Dvorak, Vaclav Sklenicka
Summary: The study compared the creep properties of nickel-based superalloys, including creep behavior, fracture mode, and deformation mechanism. Results showed that MAR-M247 exhibited the best creep properties, followed by B1914 and INC713 LC. All three alloys met the requirements for high temperature components.
Article
Materials Science, Multidisciplinary
Takahiro Masuda, Shoichi Hirosawa, Zenji Horita
Summary: In this study, an earlier version of the continuous HPT (CHPT) process was further developed to simultaneously process two wires for grain refinement. The modified CHPT process using enlarged anvils achieved a grain size reduction in pure Al to around 1 μm and in the Al-2% Fe alloy to around 400 nm, with a tensile strength of 280 MPa and an equivalent strain of around 25 introduced through the process. The study suggests the feasibility of using multiple wires in the CHPT process when the anvil diameter is increased.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Yoshifumi Ikoma, Terumasa Yamasaki, Takahiro Masuda, Yoshinori Tange, Yuji Higo, Yasuo Ohishi, Martha R. McCartney, David J. Smith, Zenji Horita
Summary: In situ observation using synchrotron X-ray diffraction was conducted to study the phase transformation in Si containing diamond-cubic and metastable phases during annealing. Metastable body-centred-cubic and hexagonal diamond phases were identified at different annealing temperatures, suggesting a phase transformation mainly from bc8 to hd during the process.
PHILOSOPHICAL MAGAZINE LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Vaclav Sklenicka, Petr Kral, Kveta Kucharova, Marie Kvapilova, Jiri Dvorak, Lubos Kloc
Summary: The study aims to investigate the creep and fracture behavior of a sponge-based modified Zr1%Nb cladding alloy in the alpha-Zr and (alpha+beta)-Zr phase regions. Through constant load creep tests and metallographic analyses, it was found that there is a close relationship between creep deformation and fracture, with different final fracture modes and fracture strain values observed in different phase regions.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Takahiro Masuda, Kazushige Fujimitsu, Kosei Sumikawa, Takahiro Kajita, Yongpeng Tang, Shoichi Hirosawa, Yoichi Takizawa, Manabu Yumoto, Yoshiharu Otagiri, Zenji Horita
Summary: This study investigates the strain distribution in the high-pressure sliding processing for rods of pure Al and an AZ61 alloy, revealing the preferential introduction of strain in an oblique direction and suggesting solutions for improving the homogeneous strain distribution.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Petr Kral, Jiri Dvorak, Vaclav Sklenicka, Zenji Horita, Yoichi Takizawa, Yongpeng Tang, Lubomir Kral, Marie Kvapilova, Pavla Roupcova, Jakub Horvath
Summary: Creep behavior of S304H austenitic steel improved significantly at 500 degrees C after high-pressure sliding (HPS) processing, but deteriorated at 600 degrees C and 700 degrees C. The creep behavior was found to be related to the thermal stability of the processed microstructure.
Article
Materials Science, Multidisciplinary
Jiri Pechousek, Erno Kuzmann, Rene Vondrasek, Anna Olina, Vlastimil Vrba, Lukas Kouril, Tomas Ingr, Petr Kral, Miroslav Mashlan
Summary: This study investigated low-alloy 42CrMo4 steels using various testing methods and found that grinding and polishing of metallographic samples has a significant impact on the final results.
Review
Materials Science, Multidisciplinary
Kaveh Edalati, Andrea Bachmaier, Victor A. Beloshenko, Yan Beygelzimer, Vladimir D. Blank, Walter J. Botta, Krzysztof Bryla, Jakub Cizek, Sergiy Divinski, Nariman A. Enikeev, Yuri Estrin, Ghader Faraji, Roberto B. Figueiredo, Masayoshi Fuji, Tadahiko Furuta, Thierry Grosdidier, Jeno Gubicza, Anton Hohenwarter, Zenji Horita, Jacques Huot, Yoshifumi Ikoma, Milos Janecek, Megumi Kawasaki, Petr Kral, Shigeru Kuramoto, Terence G. Langdon, Daniel R. Leiva, Valery Levitas, Andrey Mazilkin, Masaki Mito, Hiroyuki Miyamoto, Terukazu Nishizaki, Reinhard Pippan, Vladimir V. Popov, Elena N. Popova, Gencaga Purcek, Oliver Renk, Adam Revesz, Xavier Sauvage, Vaclav Sklenicka, Werner Skrotzki, Boris B. Straumal, Satyam Suwas, Laszlo S. Toth, Nobuhiro Tsuji, Ruslan Z. Valiev, Gerhard Wilde, Michael J. Zehetbauer, Xinkun Zhu
Summary: This article comprehensively reviews recent advances in the development of ultrafine-grained and nanostructured materials through severe plastic deformation and provides a brief history of this field. Severe plastic deformation methods have been effective in producing materials with advanced mechanical and functional properties, and the field of NanoSPD has experienced significant progress in the past two decades.
MATERIALS RESEARCH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Evander Ramos, Takahiro Masuda, Zenji Horita, Suveen Mathaudhu
Summary: This study characterized the electrical conductivity of pure copper discs processed by HPT and found that the conductivity varied with strain in agreement with literature and expectations based on grain boundary evolution. The spiral conductivity testing method introduced in this study can improve the characterization of HPT materials in future studies.
Article
Chemistry, Physical
Jiri Dvorak, Petr Kral, Andrey G. Kadomtsev, Vladimir I. Betekhtin, Maria V. Narykova, Marie Kvapilova, Vaclav Sklenicka
Summary: The commercial purity of VT1-0 titanium was processed using the rolling process to obtain an ultrafine-grained microstructure. Static annealing after processing led to a significant decrease in creep properties. The control creep mechanisms were determined based on the value of steady-state creep rate. Titanium prepared at elevated and room temperatures exhibited higher creep strength compared to titanium prepared at cryo-temperatures. Post-SPD annealing resulted in a significant decrease in creep properties.
Article
Nanoscience & Nanotechnology
Marie Kvapilova, Marie Ohankova, Petr Kral, Jiri Dvorak, Kveta Kucharova, Josef Cmakal, Vaclav Sklenicka
Summary: The effect of service degradation on the microstructure and creep properties of a 0.5%Cr-0.5%Mo-0.3%V steel steam pipe after 77,900 hours of accumulated service time was investigated. The results showed that the dispersion of fine vanadium carbides played a significant role in the high creep resistance of the steel. However, the coarsening of vanadium carbides during creep resulted in a weakening of the precipitation hardening and a decrease in creep resistance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Lenka Kuncicka, Michal Jambor, Petr Kral
Summary: By optimizing the fabrication method, copper components with both advantageous electric conductivity and favorable mechanical properties can be acquired. In this study, the effects of different deformation conditions on the structure and properties of copper were investigated. It was found that deformation under cryogenic conditions resulted in refined structure and improved mechanical and electric behaviors compared to deformation at room temperature.
Article
Materials Science, Multidisciplinary
P. Kral, J. Dvorak, V Sklenicka, T. Masuda, Y. Tang, Z. Horita, L. Kuncicka, K. Kucharova, M. Kvapilova, M. Svobodova
Summary: The creep behavior of P92 steel at 923 K deformed by rotary swaging (RS) and high-pressure torsion (HPT) was studied, revealing that both microstructures coarsen with increasing creep time and strain. Creep strain accelerates the coarsening, especially in the HPT-processed state, affecting the creep mechanism. RS-processed P92 steel showed faster creep rate and higher ductility compared to coarse-grained (CG) state, although at high stresses, it exhibited similar creep behavior to CG state.
KOVOVE MATERIALY-METALLIC MATERIALS
(2021)
