Experimental and theoretical analysis of multiphase microstructure in a newly designed MnSiCrC quenched and partitioned steel to promote bainitic transformation: The significant impact on mechanical properties

被引：18
作者：
An, B. [1 ,2 ]
Zhang, C. [1 ]
Gao, G. [3 ]
Gui, X. [3 ]
Tan, Z. [3 ]
Misra, R. D. K. [4 ]
Yang, Z. [1 ]
机构：
[1] Tsinghua Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Adv Mat, Beijing 100084, Peoples R China
[2] Cent Iron & Steel Res Inst, Inst Special Steels, Beijing 100081, Peoples R China
[3] Beijing Jiaotong Univ, Mat Sci & Engn Res Ctr, Beijing 100044, Peoples R China
[4] Univ Texas El Paso, Lab Excellence Adv Steel Res, Dept Met & Mat Engn, El Paso, TX 79968 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2019年 / 757卷
基金：
中国国家自然科学基金;
关键词：
Mn-Si-Cr-C steel; Laser scanning confocal microscopy; Retained austenite; Mechanical properties; CR-C STEEL; RETAINED AUSTENITE; P PROCESS; M-S; CARBON; MARTENSITE; STABILITY; BEHAVIOR; DUCTILITY; EVOLUTION;
D O I：
10.1016/j.msea.2019.04.099
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Multiphase microstructure with carbide-free bainite, martensite and a small amount of film-like retained austenite was obtained in a new Mn-Si-Cr-C steel, designed to promote bainite transformation. The microstructural constituents were studied by a combination of electron microscopy, x-ray diffraction, dilatometry and high temperature laser confocal microscopy. A critical analysis of experimental data and theoretical analysis underscored that the austenite stability is enhanced by bainitic transformation, during quenching and partitioning process, besides carbon partitioning. The nucleation of bainite divided the untransformed austenite and refined the grain size of retained austenite, benefiting the mechanical properties, especially low temperature toughness.
引用
收藏
页码：117 / 123
页数：7
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