Article
Chemistry, Physical
Qian Wang, Tian Liu, Li Tan, Xiaonong Cheng, Zhizhong Yuan, Yulin Ju, Fuyang Cao, Hengnan Ding, Leli Chen, Baosen Zhang, Rui Luo
Summary: Multi-pass isothermal continuous hot deformation experiments were conducted to study the grain evolution in the as-cast alumina-forming austenite heat-resistant alloy. The alloys exhibited significant work-hardening characteristics under different deformation conditions, with dynamic recrystallization and static recrystallization occurring. The study confirmed that multi-pass isothermal continuous hot deformation can improve the alloy microstructure and guide industrial production.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Songjun Chen, Liejun Li, Ruxue Zhu
Summary: The hot deformation behavior and microstructure evolution of SAE8620RH gear steel were investigated. A strain compensation constitutive model was developed and processing maps were established. The study found a mathematical relationship between material-related parameters and strain and determined the optimal processing conditions.
Article
Materials Science, Multidisciplinary
Mehdi Shaban Ghazani, Beitallah Eghbali
Summary: This study investigated the hot deformation behavior and microstructural evolution of AISI 321 austenitic stainless steel under different conditions using hot flow curves and strain hardening exponent. The results showed dynamic recovery, single and multiple peak dynamic recrystallization, and interactions between dynamic recrystallization and precipitation under different conditions.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yang Gao, Dayun Sun, Zhu Liu, Shuo Cong, Rui Tang, Yanping Huang, Lefu Zhang, Xianglong Guo
Summary: The corrosion characteristics of a novel alumina-forming austenitic steel in high-pressure high-temperature water environment were studied. The addition of aluminum has a negative effect on the continuity of the alumina scale.
Article
Materials Science, Multidisciplinary
Luhai Liao, Zhengxiang Zhao, Wei Zhang, Jingyuan Li, Yulai Chen, Liaoting Pan
Summary: The hot deformation behavior and dynamic recrystallization of super-austenitic stainless steel were studied through uniaxial compression tests. The apparent activation energy for hot deformation was determined to be 556 kJ/mol. A processing map based on dynamic materials modeling was used to analyze the different hot working domains and their corresponding dynamic recrystallization fractions and grain sizes. It was observed that the formation of sigma phase at low-temperature and low-strain rate inhibited the development of dynamic recrystallization. High-strain rate domains showed predominantly high nucleation resulting in a finer grain size, while low-strain rate domains had a higher dynamic recrystallization fraction and larger grain size due to grain growth. The softening of austenite was mainly achieved through discontinuous dynamic recrystallization, and continuous dynamic recrystallization occurred only at low-strain rate and high-temperature domain. Furthermore, multiple twinning was observed in dynamic recrystallization, suggesting the propagation of twin boundaries through interactions with pre-existing twin boundaries.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
H. Khorshidi, A. Kermanpur, H. Rastegari, E. Ghassemali, M. C. Somani
Summary: The hot deformation characteristics of a FeCrMnN austenitic stainless steel with 0.28 wt.% nitrogen were investigated through hot compression tests, revealing dynamic recrystallization at high temperatures and regions of unstable flow at low temperatures and high strain rates.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Matruprasad Rout, Surjya K. Pal, Shiv Brat Singh
Summary: In this study, the microstructure evolution of austenitic stainless steel after deformation at elevated temperatures was investigated through thermo-mechanical processing. The results showed that at temperatures of 900 degrees C and 1000 degrees C, the microstructures of samples held for 2 seconds consisted of deformed grains, while the sample held at 1100 degrees C showed nearly complete recrystallization. The increase in holding time resulted in a decrease in low angle boundaries and an increase in high angle grain boundaries at all three temperatures.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Review
Materials Science, Multidisciplinary
Qiuzhi Gao, Ziyun Liu, Linlin Sun, Qingshuang Ma, Hailian Zhang, Jing Bai, Xiaoping Lin, Liming Yu, Huijun Li
Summary: Alumina-forming austenitic (AFA) stainless steel, a promising candidate material for manufacturing high-temperature components, has been investigated for its recent progress in precipitations, high-temperature creep properties, and oxidation resistance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Ting-Ting Chen, Jing Wang, Yi Zhang, Ping Jiang, Fu-Ping Yuan, Pei-De Han, Xiao-Lei Wu
Summary: Gradient structure (GS) design, with deformation twin-density as a gradient variable, is proposed to enhance the synergy between strength and ductility. Tensile tests show that the GS exhibits a significant increase in yield strength while maintaining comparable ductility. The presence of mechanical hysteresis loops and the interaction between deformation twins and dislocations contribute to the improved mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Majid Zare, Mirtaher Seiyed Beigi, Habibollah Rastegari
Summary: The present research investigated the hot working behavior of a steel used in twin-roll-casting shell roller manufacturing. The study utilized Bahr Dil 805 dilatometer instrument and examined the material at various temperatures and strain rates. The results indicated that dynamic recrystallization was the main deformation mechanism within specific temperature and strain rate ranges. Deformation at lower temperatures could result in material cracking or the formation of a necklace-like microstructure.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Jiahui Du, Peng Chen, Xianjun Guan, Jiawei Cai, Qian Peng, Chuang Lin, Xiaowu Li
Summary: This study investigates the effect of strain rates on the tensile properties of a specific steel and clarifies the dominant deformation mechanism. The results show that the yield strength of the steel increases with increasing strain rates, and a good strength-ductility combination is achieved at a specific strain rate. The combination of microband induced plasticity and twinning induced plasticity leads to continuous strain hardening behavior and superior mechanical properties.
Article
Nanoscience & Nanotechnology
Ziyun Liu, Qingshuang Ma, Chenchen Jiang, Qiuzhi Gao, Hailian Zhang, Huijun Li, Chengxian Zhang, Xiaoping Lin
Summary: The microstructural evolution of alumina-forming austenitic steel under different cold rolling reductions during creep test was investigated. The coarsening of B2-NiAl phase and sigma phase was found to be the main factor for the decline of creep property. It was also observed that the shape of B2-NiAl phase changed with increasing creep time and sigma phase grew adjacent to the plate-shape B2-NiAl phase.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Qiuzhi Gao, Chenchen Jiang, Hailian Zhang, Qingshuang Ma, Huijie Zhang, Ziyun Liu, Huijun Li
Summary: The microstructural evolutions of AFA steel after cold-rolled reductions and subsequent aging at 700 degrees C were studied. It was found that increased dislocations from cold rolling enhanced the volume fraction and refined the particle size of precipitates, but also accelerated the coarsening rate. Cold-rolled AFA steel aged for 2 hours exhibited excellent mechanical properties due to the synergistic strengthening of dislocations and precipitates.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Qiuzhi Gao, Ziyun Liu, Huijun Li, Hailian Zhang, Chenchen Jiang, Aimin Hao, Fu Qu, Xiaoping Lin
Summary: The oxidation behavior and mechanism of as-received and 30% cold-rolled alumina-forming austenitic steel were studied. Both types of steel demonstrated improved high-temperature oxidation resistance due to the formation of dense Al2O3 oxide scale. Gradual spallation of outer scale led to the formation of continuous and dense alumina scale.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Shi-ping Xi, Xin-liang Gao, Wei Liu, Yan-lu Lu, Gui-qin Fu, Hui-cheng Tao, Yong-chang Zang
Summary: The hot deformation behavior of a low-alloy offshore steel was systematically investigated in terms of temperature and strain rate, with the Zener-Hollomon Z-parameter value playing a significant role in controlling grain size and dynamic recrystallization. Results indicated that dynamic recrystallization is hindered when the Z-parameter value exceeds 3.43 x 10(16) under experimental conditions.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2022)
Article
Chemistry, Physical
Rui Luo, Leli Chen, Yuanxiang Zhang, Yu Cao, Ching-Tun Peng, Yuyan Yang, Tian Liu, Qi Zheng, Xiaonong Cheng
Summary: The thermal-mechanical experiments on a newly developed Fe-Cr-Ni-Al-Nb superalloy revealed that higher temperature, lower strain rate, and larger true strain were favorable for dynamic recrystallization. The study also identified three stages during dynamic recrystallization and three different mechanisms for the process.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Manufacturing
Kenta Yamanaka, Asumi Kuroda, Miyu Ito, Manami Mori, Huakang Bian, Takahisa Shobu, Shigeo Sato, Akihiko Chiba
Summary: The study quantitatively analyzed the dislocation structures formed in Ti-6Al-4V alloy during additive manufacturing processes, revealing significant differences in microstructures between LB-PBF and EB-PBF, affecting dislocation density and crystallite size. High-energy synchrotron radiation analysis showed that nanosized beta-phase precipitates exhibited a higher dislocation density than the surrounding alpha (alpha')-matrix.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Yujie Cui, Kenta Aoyagi, Yuichiro Koizumi, Cheng Yang, Huakang Bian, Yuichiro Hayasaka, Tadashi Fujieda, Akihiko Chiba
Summary: The addition of Nb significantly improves the oxidation resistance of Ti-based alloys without significantly affecting their tensile properties. This enhancement is mainly attributed to the substitution of Ti4+ by Nb5+ in TiO2 and the promotion of a Sn-rich layer formation.
Article
Chemistry, Physical
Yunwei Gui, Yujie Cui, Huakang Bian, Quanan Li, Lingxiao Ouyang, Akihiko Chiba
Summary: By adding Sm, the microstructure of Mg-5Y-2Nd-xSm-0.5Zr alloys was refined, leading to a significant decrease in grain size as Sm content increased. The alloy exhibited improved compressive strength and maximum strain with the addition of Sm.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Yujie Cui, Kenta Aoyagi, Huakang Bian, Yuichiro Hayasaka, Akihiko Chiba
Summary: Increasing Al concentration in Mg-Al-Zn alloys can restrict the growth of twins and reverse motion of twin boundaries, leading to the formation of smaller-sized twins and higher fractions of secondary twins and 2-5 degrees boundaries during reverse tension. The increased amount of Al solute atoms plays a crucial role in enhancing the strengthening effect on the motion of twin boundaries.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Rui Luo, Yun Cao, Huakang Bian, Leli Chen, Ching-Tun Peng, Fuyang Cao, Lingxiao Ouyang, Yu Qiu, Yanjin Xu, Aikihiko Chiba, Xiaonong Cheng
Summary: In this study, the hot workability of a spray formed 7055 aluminum alloy was investigated using advanced Gleeble thermo-mechanical simulation technology and EBSD technology. It was found that with increasing deformation parameters, the grains become finer and the distribution of crystal orientation becomes more homogeneous. Additionally, both Continuous Dynamic Recrystallization (CDRX) and Discontinuous Dynamic Recrystallization (DDRX) mechanisms coexist during hot deformation.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Yunwei Gui, Yujie Cui, Huakang Bian, Quanan Li, Lingxiao Ouyang, Akihiko Chiba
Summary: This study systematically investigated the microstructural evolution and deformation mechanism of an aged Mg-5Y-2Nd-3Sm-0.5Zr alloy during uniaxial compression at room temperature. The results showed a transition from slip and twinning to pyramidal II dislocations dominating the deformation mechanism.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Seungkyun Yim, Huakang Bian, Kenta Aoyagi, Akihiko Chiba
Summary: The study introduced a multi-stage heat treatment method to refine the microstructure of Ti-48Al-2Cr-2Nb alloy, achieving a tailored duplex structure with improved tensile strength and elongation. This study provides a simple pathway to refine the grain size and interlamellar spacing of gamma-TiAl alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Yulong Zhu, Yu Cao, Qubo He, Jieke Zhang, Rui Luo, Hongshuang Di, Guangjie Huang, Qing Liu
Summary: This study investigated the hot deformation behavior of Alloy 925 through isothermal hot compression tests in different temperature and strain rate ranges. The stress distribution in three-dimensional space was reconstructed using an artificial neural network model. 3D distribution maps of strain rate sensitivity and power dissipation efficiency were proposed, and a novel 3D processing map was established. Microstructural characterization revealed differences between stable and unstable regions, and the optimal processing parameters were determined.
Article
Chemistry, Physical
Tian Liu, Xiaonong Cheng, Rui Luo, Yu Cao, Hengnan Ding, Leli Chen, Qian Wang, Baosen Zhang
Summary: The strain-induced precipitation process in austenitic Inconel 617B superalloy in its service temperature range was systematically investigated. The main strain-induced precipitate was identified as M23C6 carbide, with a minimum incubation period of 30 s at 800 degrees C. The morphological evolution of the precipitates and their influence on flow stress during deformation were studied in detail.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Hengnan Ding, Xiaonong Cheng, Tian Liu, Fuyang Cao, Leli Chen, Rui Luo, Yuanxiang Zhang, Baosen Zhang
Summary: This study focuses on the improved high-temperature strength and mechanical properties of hot work die steels using modified SF01 steel. The modified SF01 steel exhibits higher yield strength and lower elongation compared to conventional H13 steel over a wide temperature range. The microstructural characteristics are correlated with the yield strength, and the unsatisfactory toughness of SF01 steel is attributed to the presence of VC.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Tian Liu, Qi Zheng, Xiaonong Cheng, Rui Luo, Yuanxiang Zhang, Hengnan Ding, Leli Chen, Pei Gao, Qian Wang, Baosen Zhang
Summary: The study investigated the effects of recrystallization annealing on the microstructure evolution and tensile behavior of Inconel 617B alloy pipes at 750°C. It was found that annealing temperature significantly impacted the grain size and grain growth rate, affecting both the strength and ductility of the alloy. Furthermore, the interaction between Cr-rich phases and dislocations played a crucial role in strengthening the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Qian Wang, Tian Liu, Li Tan, Xiaonong Cheng, Zhizhong Yuan, Yulin Ju, Fuyang Cao, Hengnan Ding, Leli Chen, Baosen Zhang, Rui Luo
Summary: Multi-pass isothermal continuous hot deformation experiments were conducted to study the grain evolution in the as-cast alumina-forming austenite heat-resistant alloy. The alloys exhibited significant work-hardening characteristics under different deformation conditions, with dynamic recrystallization and static recrystallization occurring. The study confirmed that multi-pass isothermal continuous hot deformation can improve the alloy microstructure and guide industrial production.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Tian Liu, Xiaonong Cheng, Hengnan Ding, Leli Chen, Qian Wang, Di Zhang, Rui Luo
Summary: The effect of strain on the microtexture and recrystallization of the GH4169 alloy was investigated using EBSD. The strain gradually increases from the edge to the center of the compressed sample, leading to increased recrystallization. The generation of new sigma 3 boundaries within the DRX grains affects the deformation microstructure, resulting in a decrease in the overall maximum intensity of the microtexture.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Yulong Zhu, Yu Cao, Fei Yuan, Junhao Ma, Qubo He, Rui Luo, Xuhong Jia, Quanyi Liu, Jun Xiao
Summary: The dynamic recrystallization (DRX) kinetics behavior and its effect on the microstructure evolution of Incoloy 925 were investigated through isothermally hot compression tests. The DRX fraction was evaluated under different deformation conditions using electron backscatter diffraction analysis combined with artificial neural network approach. Two different models, namely the traditional Avrami-DRX kinetics model and the strain-rate dependent Avrami-DRX kinetics model modified by genetic algorithm & BiHill function, were used to study the DRX behavior. The results showed that the modified model exhibited better robustness under conditions with relatively low DRX fraction or at high strain rates.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
