中南大学学报（自然科学版）2025，Vol.56Issue(9)：3658-3668,11.DOI:10.11817/j.issn.1672-7207.2025.09.008
异质结构Fe-Mn-Al-C系TWIP钢的低温拉伸变形行为研究
Tensile deformation of a hetero-structured Fe-Mn-Al-C TWIP steel at cryogenic temperature
摘要
Abstract
High manganese austenitic steels is a potential material for low-temperature applications due to their excellent low-temperature properties,such as high strength,high ductility and excellent toughness.In this paper,the microstructure evolution and main deformation mechanism of the commercially-used Fe-Mn-Al-C steel during tensile deformation at liquid nitrogen temperature(LNT,77 K)were analyzed by X-ray diffraction(XRD),scanning electron microscopy(SEM)and high-resolution transmission electron microscopy(HRTEM).The results show that despite the reduction in temperature,the steel maintains an excellent balance between strength and ductility.The TWIP steel exhibits a yield strength of 930 MPa,a tensile strength of 1 140 MPa,and a total elongation of 36%,with a plastic elongation contribution of 26%.Compared with the mechanical properties at room temperature,the strength is improved but with a compromise of the plasticity.Compared with that deformed at RT,the deformation mechanisms of the TWIP steel at LNT are rather complex,which includes dislocation slip,twinning,twin-stacking fault(SF)interaction,SF-SF interactions as well as twin-twin interactions.Besides,the TWIP steel presents obvious hetero-structured characteristics,which activate the new hetero-deformation induced(HDI)hardening mechanism.Those phenomena significantly promote the strain hardening capability and plasticity at cryogenic temperature.The study can provide new strategy for the breakthrough of the strength-plasticity synergy in traditional materials,especially in the high-strength nano-structured materials.关键词
TWIP钢/异质结构/低温拉伸/变形机制/力学性能Key words
TWIP steel/heterostructure/low-temperature tensile/deformation mode/mechanical properties分类
通用工业技术引用本文复制引用
吴岱霏,郭王斌,陈孟,茅玮辰,欧小琴,宋旼..异质结构Fe-Mn-Al-C系TWIP钢的低温拉伸变形行为研究[J].中南大学学报（自然科学版）,2025,56(9):3658-3668,11.基金项目
国家重点研发计划项目(2022YFE0134400) （2022YFE0134400）
国家自然科学基金资助项目(51901248) （51901248）
湖南省自然科学基金资助项目(2023JJ40742)(Project(2022YFE0134400)supported by the National Key Research and Development Program of China （2023JJ40742）
Project(51901248)supported by the National Natural Science Foundation of China （51901248）
Project(2023JJ40742)supported by the Natural Science Foundation of Hunan Province) （2023JJ40742）
