Role of Solute Rare Earth in Altering Phase Transformations during Continuous Cooling of a Low Alloy Cr-Mo-V Steel

被引：0
作者：
Jiang, Zhonghua [1 ]
Wang, Pei [1 ]
Li, Dianzhong [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
来源：
ACTA METALLURGICA SINICA-ENGLISH LETTERS | 2023年 / 36卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Low-alloy Cr-Mo-V steel; Rare earth; Phase transformation; Bainitic microstructures; Continuous cooling transformation; HEAT-AFFECTED ZONE; MECHANICAL-PROPERTIES; ISOTHERMAL TRANSFORMATION; IMPACT TOUGHNESS; MICROSTRUCTURE; STRENGTH; BAINITE; AUSTENITE; ELEMENTS; TEMPERATURE;
D O I：
10.1007/s40195-023-01570-3
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Effects of solute rare earth (RE) on continuous cooling transformation of a low-alloy Cr-Mo-V bainitic steel are investigated in detail by dilatometry, optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Microstructures appeared in thermal dilatometric samples of both low-alloy Cr-Mo-V (RE) steels are composed of quasi-polygonal ferrite (QPF), degenerate pearlite (DP), granular bainite (GB), lath bainite (LB), and martensite (M) depending on cooling rate. When cooling rate is lower than 2 & DEG;C/s, the addition of RE suppresses QPF transformation, and thereby inducing a broader transformation region of GB. When cooling rate ranges from 2 to 100 & DEG;C/s, the addition of RE decreases the start temperature of bainitic transformation distinctly, which results in finer bainitic ferrite grain size and higher dislocation density. The addition of RE can enhance the hardness of the low alloy Cr-Mo-V steel by affecting the aforementioned diffusional and/or partly displacive transformation. However, when cooling rate increases up to 150 & DEG;C/s, two steels have the same hardness value of about 435 HV due to only martensite obtained by displacive transformation.
引用
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页码：1523 / 1535
页数：13
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