Low-temperature bainite in low-carbon steel

被引:86
作者
Long, X. Y. [1 ]
Zhang, F. C. [1 ]
Kang, J. [1 ]
Lv, B. [2 ]
Shi, X. B. [1 ]
机构
[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China
[2] Yanshan Univ, Sch Environm & Chem Engn, Qinhuangdao 066004, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 594卷
基金
美国国家科学基金会; 中国国家自然科学基金;
关键词
Low-temperature bainite; Low-carbon steel; Microstructure; Mechanical property; MECHANICAL-PROPERTIES; ALLOYING ELEMENTS; AUSTENITE; STRENGTH; BEHAVIOR; TENSILE; MICROSTRUCTURES; TRANSFORMATION; MARTENSITE; BEARING;
D O I
10.1016/j.msea.2013.11.089
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The microstructures and the mechanical properties of 30MnSiCrAlNiMo low-carbon steel were systematically optimized by a series of heat-treatment processes, and the heat-treatment process of low-temperature bainite in low-carbon steel was explored. Results showed that the microstructure of low-temperature bainite in the low-carbon steel, containing a fine plate of carbide-free bainitic ferrite and a thin film of retained austenite, could be produced by continuous cooling transformation around the Ms temperature from Ms+10 degrees C to Ms-20 degrees C at a cooling rate of 0.5 degrees C min(-1). A new model was proposed to evaluate the comprehensive mechanical properties of steel, which found that the low-temperature bainite had the best comprehensive mechanical properties compared to any other microstructures for the low-carbon steel. The higher dislocation density and finer bainitic ferrite plate in the low-temperature bainite resulted in the higher yield strength and the higher toughness, but relatively lower ultimate tensile strength owing to the lower work-hardening rate caused by the higher initial dislocation density. There were some very fine particles in the bainitic ferrite of the steel after isothermal treatment at higher temperature. The ultimate tensile strength and the low-temperature impact toughness of the steel decreased with the volume fraction of the retained austenite increasing, while the elongation initially increased with an increase in the volume fraction of the retained austenite (< 10%) and then remained constant. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:344 / 351
页数:8
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