文献类型：期刊文献

英文题名：Microstructural evolution and TRIP/HDI mechanisms in heterostructured manganese steel: The critical role of initial microstructure

作者：Sun, Xiaoyun[1,2];Jian, Huadong[1];Liu, Qi[1];Huang, Zhongjia[1,2];Ren, Yancong[1];Xi, Xiaohui[3];Shi, Xinying[4]

机构：[1]Anhui Polytech Univ, Sch Mat Sci & Engn, Wuhu 241000, Peoples R China;[2]Anhui Chungu 3D Printing Smart Equipment Ind Techn, Wuhu 241000, Peoples R China;[3]Guangdong Ocean Univ, Sch Mech Engn, Zhanjiang 524088, Peoples R China;[4]Jiangsu Normal Univ, Sch Phys & Elect Engn, Xuzhou 221116, Peoples R China

年份：2026

卷号：40

起止页码：251

外文期刊名：JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

收录：SCI-EXPANDED(收录号：WOS:001648009000001)、、EI(收录号：20255119754414)、Scopus(收录号：2-s2.0-105025006763)、WOS

基金：This work was financially supported by the National Natural Science Foundation of China (No. 52401133 and 52401141) . This work was also supported by the Key Project of Anhui Provincial Department of Edu-cation (No. 2024AH050131 and 2023AH052702) , Science and Tech-nology Project of Wuhu City (No.2023yf106) , Research Project of Anhui Polytechnic University (No. HX202305003) .

语种：英文

外文关键词：Medium manganese steel; Poly-morphology; Heterogeneous structure; TRIP effect; HDI hardening

外文摘要：This study employed two-stage hot compression experiments with varying deformation amounts (30 %-70 %) to successfully regulate the stored energy and grain size of the initial microstructure before annealing, producing heterogeneous structured medium-Mn steel with diverse morphologies and a wide grain size distribution. At 70 % high deformation, the high dislocation density and refined grain structure significantly enhance the driving force for austenite reverse transformation, making it the dominant mechanism. In contrast, under lower deformation conditions, the reduced driving force for austenite reverse transformation allows recrystallization to become the primary mechanism. The higher stored energy from severe deformation promotes the growth and partial aggregation of austenite, ultimately resulting in a heterogeneous microstructure with polymorphic morphologies (blocky, lath-like and granular) and a broad grain size distribution. This heterogeneous microstructure induced a multi-stage transformation-induced plasticity (TRIP) effect during plastic deformation, synergizing with the hetero deformation-induced (HDI) stress strengthening effect: in low-strain stage (<5 %), mechanical incompatibility between soft and hard phases initiates preliminary HDI hardening, while low-stability blocky austenite preferentially triggers the TRIP effect; in medium-strain stage (5 %-15 %), the progressive activation of multi-stage TRIP effects in lath-shaped and granular austenite continuously enhances strain gradients through the introduction of fresh hard martensite phases, thereby stimulating stronger HDI hardening; in the last stage (>15 %), as the TRIP effect nears exhaustion, the heterogeneous structure established and enhanced by the preceding TRIP effect continues to sustain the material's work hardening capacity through HDI hardening. This temporally coupled TRIP-HDI synergistic mechanism endows the material with outstanding work hardening characteristics and ductility.