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
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
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
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)
Article
Nanoscience & Nanotechnology
Xuyangfan Qiu, Yingchun Wang, Bin Yang, Zhiping Xiong, Xingwang Cheng
Summary: This study introduces multiple precipitates through annealing and aging treatments to enhance the strength and strain hardening rate of an austenitic lightweight steel. The results demonstrate that a combination of rolling, annealing, and aging produces a microstructure of nano-sized carbides within austenite grains and submicron-sized carbides along grain boundaries. Increasing the annealing temperature reduces the precipitation of certain carbides and decreases the density of dislocation. The introduction of these precipitates leads to significant improvements in yield and tensile strength compared to other steel processing methods.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Caroline Quitzke, Qiuliang Huang, Horst Biermann, Olena Volkova, Marco Wendler
Summary: This study investigated the effect of interstitial contents on the mechanical properties and strain-induced martensite formation in an austenitic stainless steel. The results showed that carbon provides a stronger austenite stabilizing effect than nitrogen, with steel alloyed with higher carbon content exhibiting optimal mechanical properties. Additionally, the interstitial content influences the occurrence of dynamic strain aging, with carbon playing a key role in this phenomenon.
Article
Chemistry, Physical
Juan Bosch, Ulises Martin, Willian Aperador, Jose M. Bastidas, Jacob Ress, David M. Bastidas
Summary: The study investigated the corrosion behavior of austenitic Fe-Mn-Al-Cr-C TWIP and MBIP steels with different alloying elements, and found pitting as the dominant corrosion mechanism in high-Mn TWIP steels. X-ray diffraction analysis revealed corrosion products and a protective Al2O3 passive film was observed. The MBIP steel exhibited the highest corrosion susceptibility in both chloride and alkaline solutions.
Article
Materials Science, Multidisciplinary
S. Shyamal, S. R. Das, M. Jaskari, D. A. Porter, L. P. Karjalainen, P. Sahu
Summary: The cyclic behavior of a high-Mn austenitic steel was studied under high-cycle bending fatigue at room temperature, with microhardness increasing as a sign of cyclic hardening until 20,000 cycles and then saturating. Deformation mechanisms varied widely in grains depending on their sizes, with stacking faults predominant in fine grains and interconnected dislocation cells observed in larger grains. Dislocation densities estimated by X-ray diffraction were relatively low at 1014 m(-2).
Article
Nanoscience & Nanotechnology
Shenghui Sun, Minghui Cai, Hua Ding, Hongshou Huang, Haijun Pan
Summary: By utilizing the Mn preservation-cold rolling-intercritical annealing route, a novel Mn-based lightweight steel with bimodal grain size distribution was obtained, showing a good balance of high strength and high ductility. The bimodal distribution of austenite grains triggered multi-stage TRIP effects and TWIP-coordinated TRIP effects, improving strain hardening ability while maintaining high tensile ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Chang-Yu Hung, Yu Bai, Nobuhiro Tsuji, Mitsuhiro Murayama
Summary: The study found a close correlation between plastic deformation mechanisms and grain size in UFG high-Mn austenitic TWIP steel, where the main mechanism shifts from conventional slip in the grain interior to twinning nucleated from grain boundaries when the grain size is less than 1 μm. This transition is deeply associated with the discontinuous yielding behavior observed in the material.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Fangjie Lan, Wenhui Du, Changling Zhuang, Changrong Li
Summary: The research shows that adding niobium to Fe-Mn-C-Al steel can significantly reduce the quantity of inclusions, with some evolving into complex niobium inclusions. When the niobium content increases to 0.08%, its influence on the inclusions in steel becomes more apparent.
Article
Materials Science, Multidisciplinary
Zhiqi Xie, Weijun Hui, Saiyihan Bai, Yongjian Zhang, Xiaoli Zhao
Summary: The impact fracture behavior of a Fe-25Mn-10Al-1.1C austenitic low-density steel was studied under two solution treatment temperatures. The presence of alpha + kappa-carbides at austenite grain boundaries resulted in a significant difference in V-notch impact energy between the samples treated at 800 degrees C (S8 sample) and 1000 degrees C (S10 sample), with values of 16.8 and 67.0 J, respectively. Differences in deformation characteristics, grain boundary precipitation of carbides, and the proportion of high-angle grain boundaries (HAGBs) and twins were identified as the main reasons for the disparity in impact toughness. The relatively low impact energy of the S10 sample compared to other high-Mn steels was also discussed.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
T. W. J. Kwok, P. Gong, R. Rose, D. Dye
Summary: Two different microstructures of medium Mn steel were obtained through different approaches in hot rolling mill, showing a simultaneous twinning induced plasticity and transformation induced plasticity (TWIP + TRIP) mechanism. However, twinning contributed relatively little to the strength of the alloy, mainly due to the small initial slip lengths that reduced the opportunity for grain work hardening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Abdullah S. Alomari, N. Kumar, Mahmoud Hawary, K. L. Murty
Summary: This study analyzed the deformation behavior and constitutive equation of the highly alloyed austenitic stainless steel Fe-25wtpctNi-20Cr at high temperatures. A hyperbolic sine constitutive relation was found to be applicable for the alloy, and the dislocation jump distance was estimated using micro mechanistic parameters. The results of this study are important for understanding the deformation behavior of the alloy under different conditions.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Ziyi Cui, Shudong He, Jie Tang, Dingfa Fu, Jie Teng, Fulin Jiang
Summary: Grain size has a significant impact on the mechanical properties and deformation behavior of twinning-induced plasticity (TWIP) steels. Larger grain size promotes twinning, resulting in a noticeable TWIP effect and a suppression of dislocation proliferation. The combination of dislocation strengthening and twinning leads to a long plateau in the work-hardening rate curve, increasing the work-hardening ability. Uniform distribution of strain at grain boundaries and twin boundaries improves plasticity by relieving stress concentration.