Correlation between microstructure and impact toughness of weld heat-affected zone in 5 wt.% manganese steels

被引：3

作者：

Li, Jun-hui ^{[1
]}

Wang, Hong-hong ^{[1
]}

Luo, Qiang ^{[1
]}

Li, Li ^{[2
]}

Sun, Chao ^{[2
]}

Misra, R. D. K. ^{[3
]}

机构：

[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Hubei, Peoples R China

[2] Nanjing Iron & Steel Co Ltd, Res Inst, Nanjing 210035, Jiangsu, Peoples R China

[3] Univ Texas El Paso, Dept Met Mat & Biomed Engn, Lab Excellence Adv Steel Res, El Paso, TX 79968 USA

来源：

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL | 2019年 / 26卷 / 07期

基金：

中国国家自然科学基金;

关键词：

5 wt% manganese steel; Welding heat-affected zone; Retained austenite; Tempered martensite; Impact toughness; TRANSFORMATION-INDUCED PLASTICITY; MECHANICAL PROPERTY RELATIONSHIP; AUSTENITE STABILITY; RETAINED AUSTENITE; REVERSED AUSTENITE; MARTENSITE; STRENGTH; BEHAVIOR; DEFORMATION; TEMPERATURE;

D O I：

10.1007/s42243-019-00274-2

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The microstructure in welding heat-affected zones of 5 wt.% manganese steels was studied, and its effect on impact toughness was analyzed. The simulated coarse-grained heat-affected zone (CGHAZ) had the lowest impact toughness of similar to 39 J at - 40 degrees C because of coarse-grained structure and least volume fraction of retained austenite (RA) of 1.2 vol.%. The impact toughness of simulated intercritical heat-affected zone (ICHAZ) and fine-grained heat-affected zone (FGHAZ) were similar to 165 and similar to 45 J, respectively, at - 40 degrees C. The effective grain size of simulated FGHAZ was smaller than that of the simulated ICHAZ. Furthermore, microstructural investigation revealed that the simulated FGHAZ and ICHAZ had similarity in volume fraction and stability of RA. However, tempered martensite was present in ICHAZ and absent in FGHAZ. It is proposed that the presence of tempered martensite contributed to good impact toughness in simulated ICHAZ.

引用

页码：761 / 770

页数：10

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