Microstructural refinement mechanism and its effect on toughness in the nugget zone of high-strength pipeline steel by friction stir welding

被引：36

作者：

Duan, R. H. ^{[1
]}

Xie, G. M. ^{[1
]}

Xue, P. ^{[2
]}

Ma, Z. Y. ^{[2
]}

Luo, Z. A. ^{[1
]}

Wang, C. ^{[3
]}

Misra, R. D. K. ^{[4
]}

Wang, G. D. ^{[1
]}

机构：

[1] Northeastern Univ, State Key Lab Rolling & Automat, 3 Wenhua Rd, Shenyang 110819, Peoples R China

[2] Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, 72 Wenhua Rd, Shenyang 110016, Peoples R China

[3] Northeastern Univ, Sch Met, 3 Wenhua Rd, Shenyang 110819, Peoples R China

[4] Univ Texas El Paso, Dept Met Mat & Biomed Engn, El Paso, TX 79968 USA

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2021年 / 93卷

关键词：

Pipeline steel; Friction stir welding; Grain refinement; M-A constituent; Toughness; HEAT-AFFECTED ZONE; MARTENSITE-AUSTENITE CONSTITUENTS; FRACTURE-TOUGHNESS; IMPACT TOUGHNESS; ALLOY-STEEL; RECRYSTALLIZATION; PRECIPITATION; EVOLUTION; BEHAVIOR; HARDNESS;

D O I：

10.1016/j.jmst.2021.04.008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High-strength pipeline steel was subjected to friction stir welding (FSW) at rotation rates of 400-700 rpm, and the grain refinement mechanism of the nugget zone (NZ) was determined. The thermo-mechanical process during FSW in the NZ was simulated by multi-pass thermal compression, thereby achieving the austenitic non-recrystallization temperature (T-nr). The austenitic non-recrystallization in the NZ at the lowest rotation rate of 400 rpm caused a significant grain refinement. Furthermore, the reduced rotation rate also resulted in the formation of a high ratio of island-like martensite-austenite (M-A) constituent. The toughness of the NZs was enhanced as the rotation rate decreased, which is attributed to the fine effective grains and homogeneously distributed fine M-A constituents dramatically inhibiting crack initiation and propagation. (C) 2021 Published by Elsevier Ltd on behalf of Chinese Society for Metals.

引用

页码：221 / 231

页数：11

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