Article
Nanoscience & Nanotechnology
Shucheng Shen, Pan Xie, Cuilan Wu
Summary: High-Mn steels exhibit excellent mechanical properties under extreme service conditions, such as high strain rate and low temperature. The relationship between deformation temperature, mechanical properties, and deformation mechanisms was investigated using impact tests and microstructure characterization. The study showed that Fe-25Mn-3Al-3Si alloy had good mechanical properties under large impact load and high strain rate deformation at both high and low temperatures. The strain hardening rate was significantly higher at 300 degrees C compared to -80 degrees C and room temperature. The deformation mechanism was influenced by the strain rate, with TWIP effect being the main mechanism at 300 degrees C.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Dejun Li, Jianhua Guo, Fei He, Yaorong Feng, Dashan Guo, Fengzhang Ren, Feng Cao, Qi Yang, Wei Shi
Summary: The microstructural evolution, deformation mechanism, and mechanical properties of Fe-25Mn-3Si-3Al-0.3Nb steel in the process of cold rolling were investigated. High-density dislocation structures and strain-induced twins appeared at 30% strain, and their characteristics changed at higher strains. The addition of 0.3 wt.% Nb did not alter the plastic deformation mechanism of the steel. Cold rolling significantly improved the strength and hardness of the steel while reducing its elongation. Micro-pore aggregation fractures were observed on the fracture surface of specimens with different strains.
Article
Metallurgy & Metallurgical Engineering
Shucheng Shen, Cuilan Wu, Pan Xie, Yuanrui Liu
Summary: The study reveals that Fe-29Mn-3Al-3Si twin-induced plasticity (TWIP) steel exhibits significant strain rate sensitivity under different deformation rates, with dynamic impact deformation showing higher yield strength than quasi-static compression. Microstructural analysis shows the presence of secondary and multi-fold deformation twins in dynamic impact samples.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Chunyu Liu, Shucheng Shen, Pan Xie, Cuilan Wu
Summary: This study investigates the deformation products of Fe-20Mn-3Al-3Si TRIP steel under quasi-static compression and dynamic impact, focusing on the effect of strain rate on the deformation mechanisms. The results show that the strain induced martensitic transformation is significantly inhibited under dynamic loading, while the dynamic recovery of dislocation is promoted. Additionally, large quantities of strain induced e-martensite twins are formed in the dynamic impact sample. Compared to quasi-static compression, the impact deformation sample exhibits lower strain hardening ability.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
D. T. Pierce, J. T. Benzing, J. A. Jimenez, T. Hickel, I. Bleskov, J. Keum, D. Raabe, J. E. Wittig
Summary: The influence of temperature and stacking fault energy on the strain-hardening behavior and critical resolved shear stress for twinning in TRIP/TWIP steels was investigated. The study found that an increase in temperature, Mn content, and/or stacking fault energy led to a change in the dislocation glide mechanisms and a decrease in strain hardening rate. Additionally, the alloys exhibited a significant decrease in strength and ductility with increasing temperature.
Article
Multidisciplinary Sciences
Yu Bai, Hiroki Kitamura, Si Gao, Yanzhong Tian, Nokeun Park, Myeong-heom Park, Hiroki Adachi, Akinobu Shibata, Masugu Sato, Mitsuhiro Murayama, Nobuhiro Tsuji
Summary: The tensile mechanical properties of fully recrystallized TWIP steel specimens with various grain sizes were investigated. It was found that specimens with smaller grain sizes exhibited abnormal discontinuous yielding behavior, with an increase in dislocation density and formation of deformation twins and stacking faults. Despite conventional beliefs, the grain refinement in the specimens led to a higher density of deformation twins. The change in yielding behavior from continuous to discontinuous in ultrafine grain specimens was attributed to a limited number of free dislocations in each grain, altering deformation and twinning mechanisms.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Wei Lv, Yuheng Gu, Yanru Huang, Guojun Cai, R. D. K. Misra
Summary: Microstructure, texture and mechanical property of Fe-27Mn-3Si-4Al TWIP steels during asymmetric warm rolling were investigated. It was found that the asymmetry of the rolling process can significantly refine the microstructure and affect the texture evolution of the steels. The combination of applied asymmetry rolling at elevated reduction resulted in a high yield strength on one hand and a reasonably high elongation on the other hand. The study provides important insights into the effects of asymmetric warm rolling on the properties of TWIP steels.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Guangkai Yang, Changling Zhuang, Changrong Li, Fangjie Lan, Hanjie Yao
Summary: This study investigated the hot deformation process and ductility trough formation mechanism of Fe-15.3Mn-0.58C-2.3Al alloy at different temperatures through high-temperature tensile tests. The phase transformation process was analyzed and it was found that ferrite transformation and presence of impurities affected the mechanical properties. EBSD analysis showed a temperature range with good plasticity around 1275 degrees C, with high dislocation density being the main deformation mechanism at high temperatures.
Article
Metallurgy & Metallurgical Engineering
Janaina Rosa de Lima, Guilherme Oliveira Siqueira, Ernesto Soares Freitas Neto, Fabio Nakagomi, Dagoberto Brandao Santos, Reny Angela Renzetti
Summary: This study investigates the effects of thermal treatment and cold rolling on the microstructure and hardness of Fe-24Mn-3Al-1Ni-2Si-0.06C alloy. High-resolution X-ray diffraction technique and diffraction method are used for analysis and calculation. The results show that cold rolling increases hardness and induces deformation twins, stacking fault, and dislocation to different degrees. Annealing affects X-ray diffraction parameters such as stacking fault probability and dislocation density.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Z. H. Cai, D. L. Zhang, L. F. Ma, H. Ding, Y. Feng, J. Hu, R. D. K. Misra
Summary: The study focused on the mechanical behavior and deformation mechanisms of Fe-0.2C-11Mn-2Al medium-Mn steel at different strain rates. The ultimate tensile strength and uniform elongation varied with increasing strain rate, with different deformation mechanisms dominating at different strain rates.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Rajib Kalsar, Soheil Sanamar, Norbert Schell, H. -G. Brokmeier, R. Saha, P. Ghosh, Satyam Suwas
Summary: This study proposes a pathway for generating optimum microstructure for medium Mn containing TWIP/TRIP steels. The two-phase microstructure consists of austenite and ferrite phase arranged in a lamellar fashion. The feedback for the design of thermo-mechanical processing was obtained by conducting in-situ deformation using high energy synchrotron radiation. Diffraction patterns and X-ray line profile analysis were used to estimate the retained austenite phase fraction and other aspects of microstructural evolution. The study also analyzed the strain hardening behavior and its correlation with microstructural parameters.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Lingqiang Zhong, Zhigang Wang, Quanshun Luo, Weizhen Liu
Summary: The addition of cerium can reduce the stacking fault energy of TWIP steel, promote the formation of twinning, and improve the mechanical properties of the alloy. Adding 0.015wt% of cerium in TWIP steel can achieve the optimal mechanical properties, and cerium helps enhance the strain hardening ability of TWIP steel.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Mahmoud Khedr, Wei Li, Na Min, Wenqing Liu, Xuejun Jin
Summary: Understanding the relationship between mechanical twinning and dynamic strain aging in austenitic steels is crucial for steel development. The study investigated the effects of changing strain rates and alloying with aluminum on 12.5%Mn-1.1%C austenitic steel and 24%Mn-0.45%C-2%Al austenitic steel. It was found that increasing the strain rate enhanced the resistance to plastic deformation only during early stages of strain due to mechanical twinning promotion. Alloying with aluminum and the initial carbon concentration also influenced the formation of twin plates and the twin volume fraction.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Wenqi Mao, Si Gao, Wu Gong, Yu Bai, Stefanus Harjo, Myeong-Heom Park, Akinobu Shibata, Nobuhiro Tsuji
Summary: This study performed tensile deformation with in situ neutron diffraction measurement on an Fe-24Ni-0.3C (wt.%) TRIP-assisted austenitic steel, and proposed an analysis method based on stress partitioning and phase fractions measured by neutron diffraction. The results showed that both the transformation rate and the phase stress borne by the deformation-induced martensite played important roles in the global tensile properties of the material. The proposed decomposition analysis method could be widely applied to investigating mechanical behavior of multi-phase alloys exhibiting the TRIP phenomenon.
Article
Materials Science, Multidisciplinary
Xiliang Zhang, Rui Teng, Tao Liu, Yindong Shi, Zheng Lv, Qian Zhou, Xinyue Wang, Yanhui Wang, Hongji Liu, Zhenguo Xing
Summary: The medium Mn steel studied through a mixed multiphase preservation-intercritical annealing route exhibited excellent strength-ductility synergy, with the superhigh yield strength mainly attributed to the heterostructured sample. The deformation mechanisms involved heterogeneous duplex microstructure, heterodeformation-induced stress, and multiple strengthening and ductility-enhancing mechanisms, sequentially leading to the extraordinary strength-ductility combination of the medium Mn steel.
MATERIALS CHARACTERIZATION
(2022)
