Article
Materials Science, Multidisciplinary
Chunyu Dong, Xianming Zhao
Summary: The DRX behavior and microstructure evolution of HSLA steel were investigated through isothermal compression experiments. The flow stress was found to increase with the strain rate and decrease with the deformation temperature. A constitutive equation was established based on peak stress, and the deformation activation energy was determined. Processing maps were constructed to analyze the flow instability under different conditions. The nucleation mechanism and grain size of DRX were also studied.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Lei Zhang, Shuai Yuan, Jinhui Wang, Lijia Chen, Peipeng Jin
Summary: This study investigated the effect of deformation temperature and strain rate on the hot deformation mechanism of an as-cast Mg-5Al-0.6Sc alloy. The results showed that the flow stress decreased with increasing temperature and decreasing strain rate. A constitutive equation was established to accurately predict the hot deformation behavior of the alloy. The optimal processing area was determined based on processing maps, and the microstructure evolution and dynamic recrystallization mechanism of the alloy were analyzed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Ding-ge Fan, Kun-kun Deng, Cui-ju Wang, Kai-bo Nie, Quan-xin Shi, Wei Liang
Summary: The addition of trace SiCp reduces the activation energy of the Mg-5Zn alloy, and the optimal deformation conditions were determined based on the processing map. The study also looked at the influence of PDZ size on the activation energy, as well as the effect of SiCp on the dynamic recrystallization behavior.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Ke Zhang, Tenghao Zhang, Mingya Zhang, Zihao Chen, Hongbo Pan, Gengwei Yang, Yanguang Cao, Zhaodong Li, Xi Zhang
Summary: This study investigates the hot deformation behavior and dynamic recrystallization mechanism of Ti-V complex microalloyed high strength steel at different temperatures and strain rates. The results show that the flow stress curves exhibit dynamic recrystallization behavior at certain temperature and strain rate conditions, and the peak stress gradually decreases with increasing temperature and decreasing strain rate. The study also calculates the hot deformation activation energy of the Ti-V microalloyed steel and presents thermal processing maps.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Guo-lei Liu, Wei-li Cheng, Lin Luo, Hui Yu, Li-fei Wang, Hang Li, Hong-xia Wang, Jin-hui Wang
Summary: In this study, the dynamic recrystallization (DRX) mechanism and hot-deformation behavior of a novel precipitate-free Mge0.25Bie0.25Sn alloy were investigated. Processing maps and constitutive equations were constructed to predict the hot deformation behavior. The results showed that continuous dynamic recrystallization (CDRX), discontinuous dynamic recrystallization (DDRX), and a transformation of prismatic slip to pyramidal II slip occurred during hot compression.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Hemiao Jiang, Hongying Li, Dianyuan Huang, Yinghui Zhao, Jiwen Liu, Qing Gao, Hang He, Ximao Liu
Summary: In this study, the hot deformation behavior of 26CrMo7S steel was analyzed using a thermal simulator. The Arrhenius constitutive model was built and its accuracy was verified through error analysis. Hot processing maps were constructed to analyze the processing zone of the steel. The microstructure of the processing zones was observed and verified using electron backscattered diffraction (EBSD). The results show that the interaction of work hardening and dynamic softening influences the hot deformation behavior of 26CrMo7S steel.
Article
Materials Science, Multidisciplinary
Ali Shabani, Mohammad Reza Toroghinejad, Marieh Aminaei
Summary: The hot deformation behavior of FeCrCuMnNi high entropy alloy was studied through hot compression tests in the temperature range of 500-970 degrees C and strain rates of 0.1, 0.01, and 0.001 s-1 up to a strain of 0.6. An Arrhenius-type equation was used to evaluate the deformation behavior and propose a constitutive equation. The alloy exhibited typical hot deformation behavior with an activation energy of approximately 250 kJ/mol, mainly governed by Cu lattice diffusion. Discontinuous dynamic recrystallization (dDRX) was the main restoration phenomenon, with grain boundary sliding and dislocation sliding as the main active mechanisms. Processing maps based on energy efficiency (η) and flow instability (ξ) were plotted, revealing an instability region between 750 and 850 degrees C at different strain rates, which might be directly related to the formation of a hard sigma phase within this temperature range.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Deqing Ma, Shuai Yuan, Shiyu Luan, Peipeng Jin, Hengrui Hu, Jinhui Wang, Xiaoqiang Li
Summary: The hot deformation behavior of as-cast Mg-2Zn-0.5Mn-0.2Ca alloys was investigated by hot compression tests. The flow stress was found to increase with higher strain rates and lower temperatures. A constitutive equation was obtained, and the average activation energy was calculated. A processing map was developed, and the optimal processing parameters were determined. The microstructural analysis revealed significant differences between instability areas and stable areas, although both had a similar texture. The slip system in deformed grains was determined, and the main dynamic recrystallization mechanism was identified as discontinuous dynamic recrystallization (DDRX). The proportion of DRX increased with lower strain rates and higher deformation temperatures, weakening the texture strength.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Metallurgy & Metallurgical Engineering
Jian Sun, Jinghui Li, Ping Wang, Zhenyi Huang
Summary: The hot deformation behavior and optimum working parameters of Fe-30Mn-10Al-1C low-density steel were investigated through experiments and modeling, revealing flow stress, activation energy, and the dominant deformation mechanism during hot compression.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2022)
Article
Materials Science, Multidisciplinary
Bo Li, Yonghua Duan, Shanju Zheng, Mingjun Peng, Mengnie Li, Hengyong Bu
Summary: Hot compression tests were conducted to evaluate the hot deformation behavior of 60Mg-30Pb-9.2Al-0.8B alloy. The Arrhenius constitutive equation and processing map with strain compensation were established based on the dynamic material model. The results showed three stages in the stress-strain curves during hot compression, with characteristics of work hardening, dynamic recovery, and dynamic recrystallization. The improved Arrhenius strain compensation constitutive model had higher precision than the traditional model. Optimum hot working parameters were determined based on the analysis of the processing map.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Wenwen Zhang, Xingang Liu, Qiang Du, Haizhu Li, Heyong Qin, Qiang Tian
Summary: In this paper, a study was conducted on the microstructure evolution and deformation behavior of the GH4742 nickel-based superalloy during hot compression. Constitutive models were established for different microstructures, and the relationship between flow stress, hot processing map, and dynamic recrystallization mechanism was analyzed. The results show that the DRX mechanism is highly sensitive to the Z value.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Jinyu Wang, Jiajun Zhao, Yuhao Jia, Xiaoguang Fan, Feng He, Xian Luo, Junjie Li, Zhijun Wang, Jincheng Wang
Summary: This study investigated the hot deformation behavior of the Ni61Fe10Cr10Al17Mo2 alloy and revealed the relationship between flow stress and deformation temperature and strain rate. Constitutive equations were constructed to describe this relationship. A hot processing map was created using a dynamic material model and instability criterion. The deformed microstructures and dynamic recrystallization of the alloy were also investigated. An optimal processing route was obtained based on the processing map.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Wei-Hsun Liao, Che-Wei Tsai, Yu-Chih Tzeng, Woei-Ren Wang, Chi-San Chen, Jien-Wei Yeh
Summary: The hot deformation behavior of equimolar CoCrFeNi HEA was investigated through hot compression, and processing maps were constructed using a dynamic materials model. The experimental results were consistent with the contour map, indicating a well-deformed region at 1223 K and 10-3 s-1 with a power dissipation parameter of 0.3.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
Chunxiao Li, Jianfeng Jin, Hong Yan, Zhiwei Shan, Yaozong Mao, Rongshi Chen
Summary: The deformation behavior of Mg-14Gd-0.5Zr alloy was investigated under different temperature and strain rate conditions. The constitutive equation and processing maps were calculated to describe the flow stress behavior. Dynamic recrystallization mechanisms and dynamic precipitation process were also studied. The results provide valuable insights into the processing and microstructural evolution of the Mg-14Gd-0.5Zr alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Xiangji Li, Jiahui Wang, Yutong Jiang, Maoqiang Zhang
Summary: Through tensile tests and material analysis of magnesium-manganese rare earth alloy, this study found that the strain compensation equation accurately predicts the thermal deformation behavior, the hot processing map guides the optimal processing temperature range, and EBSD analysis reveals the temperature and dominant region of dynamic recrystallization.