Heterogeneous plastic deformation and HDI strengthening of the heterostructured dual-phase steels investigated by in-situ SEM-DIC

被引：18
|
作者：
Gao, Bo [1 ,2 ]
Liu, Yi [2 ]
Chen, Xuefei [3 ]
Sui, Yudong [4 ]
Sun, Wenwen [5 ]
Xiao, Lirong [2 ]
Zhou, Hao [2 ]
机构：
[1] Liaoning Acad Mat, Inst Mat Plainificat, Shenyang 110167, Peoples R China
[2] Nanjing Univ Sci & Technol, Nano & Heterogeneous Mat Ctr, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China
[3] Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Peoples R China
[4] Kunming Univ Sci & Technol, Sch Mat Sci & Engn, Kunming 650093, Peoples R China
[5] Southeast Univ, Dept Mat Sci & Engn, Nanjing 211189, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2024年 / 893卷
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Heterostructured materials; Dual -phase steels; Hetero-deformation induced strengthening; Strain partitioning; Digital image correlation; MARTENSITE VOLUME FRACTION; MICROSTRUCTURE EVOLUTION; MECHANICAL-PROPERTIES; HARDENING BEHAVIOR; HIGH DUCTILITY; SHEAR BANDS; STRAIN; DAMAGE; TEMPERATURE; FERRITE;
D O I：
10.1016/j.msea.2024.146149
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Heterostructured dual -phase (DP) steels comprising different martensite volume fractions (HS740 steel, VM:41 %; HS780 steel, VM: 54 %) were produced by cold rolling and intercritical annealing. HS780 steel produces a nearideal heterostructure where the grains are mostly isolated by the F/M interfaces, resulting in a superior combination of strength -ductility (ultimate tensile strength, UTS: 1064 MPa; uniform elongation, UE: 9.8 %). The excellent mechanical properties is primarily attributed to the stronger hetero-deformation induced (HDI) strengthening and hardening of HS780 steel. The relationships between HDI hardening and the heterogeneous plastic deformation of the heterostructured DP steels were elucidated based on the in -situ tensile tests and digital image correlation analysis. The insights from these results will improve our understanding of the deformation behavior of heterostructured materials and guide the design of low -carbon steels with outstanding mechanical properties.
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页数：15
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