Effect of Double Quenching on Microstructure and Impact Toughness of a High Strength Low Alloy Steel

被引：0
|
作者：
Chen G. [1 ,2 ]
Luo X. [1 ]
Chai F. [1 ]
Yang C. [1 ]
Zhang Z. [1 ]
Yang Z. [2 ]
机构：
[1] Department of Structure Steels, Central Iron and Steel Research Institute, Beijing
[2] Department of Materials Science and Engineering, Tsinghua University, Beijing
来源：
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2020年 / 34卷 / 09期
关键词：
Crack propagation; Double quenching; High-angle boundary; HSLA; Metallic materials; Toughness;
D O I：
10.11901/1005.3093.2019.580
中图分类号：
学科分类号：
摘要：
The effect of double quenching and tempering (DQT) treatment as well as the conventional quenching and tempering (CQT) treatment on the microstructure and impact toughness of a high strength low alloy steel were investigated. The results show that compared with the CQT treatment, the impact toughness improved a lot, while the yield strength just slightly decreased for the DQT treated steel. These changes were characterized by optical microscope (OM), scanning electron microscope (SEM), electron back scatter diffraction (EBSD) and transmission electron microscope (TEM). It follows that in comparison to the CQT treatment, the DQT treatment led to a finer microstructure, namely, the size of prior austenite grain and the effective grain were refined, and the density of the high angle misorientation was increased, while the frequency of deflection for the crack propagation for the DQT treated steel was much higher than the CQT treated one. The superior toughness of the DQT treated steel can be attributed to the finer microstructure.
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页码：705 / 711
页数：6
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