Effect of Heat Treatment on Microstructure and Mechanical Properties of New Cold-Rolled Automotive Steels
Effect of Heat Treatment on Microstructure and Mechanical Properties of New Cold-Rolled Automotive Steels
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DOI：
10.3390/met10111414
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发表时间：
2020-11-01
期刊：
影响因子：
2.9
通讯作者：
Wang, Yongqiang
中科院分区：
文献类型：
--
作者：
Huang, Fei;Chen, Jian;Wang, Yongqiang
利用等温热处理、光学显微镜、扫描电子显微镜、显微硬度计和拉伸试验机研究了奥氏体化温度和时效处理对两种新型冷轧汽车钢板(20Mn2Cr和20Mn2CrNb)组织和性能的影响。结果表明，随着奥氏体化温度的升高，两种钢的原始奥氏体晶粒度均增大。20Mn2CrNb的原始奥氏体晶粒度小于20Mn2Cr的原始奥氏体晶粒度。20Mn2CrNb的显微硬度随时效温度的升高而逐渐降低，而20Mn2Cr的硬度随时效温度的升高呈不规则变化。在相同的热处理工艺下，20Mn2CrNb的力学性能优于20Mn2CrNb。热处理对组织和性能的影响与马氏体量、位错密度和第二相粒子的析出有关。
The effect of austenitizing temperature and aging treatment on the microstructure and mechanical properties of two new cold-rolled automotive steel plates (20Mn2Cr and 20Mn2CrNb) was investigated by using isothermal heat treatment, optical microscope, scanning electron microscope, microhardness tester, and tensile testing machine. The results show that as the austenitizing temperature increased, the original austenite grain sizes of both steels increased. The original austenite grain size of 20Mn2CrNb was smaller than that of 20Mn2Cr. The microhardness of 20Mn2CrNb gradually decreased with increasing aging temperature, while the hardness of 20Mn2Cr varied irregularly. The mechanical properties of 20Mn2Cr were better than those of 20Mn2CrNb under the same heat-treatment process. The effect of heat treatment on microstructure and mechanical properties was related to the martensite content, dislocation density, and precipitation of second-phase particles.