Microstructure and softening of advanced high-strength steel QP1180 lap joints welded with CMT

被引：22

作者：

Wang, Xuerou ^{[1
]}

Wu, Yue ^{[2
]}

Pan, Hua ^{[2
]}

Yao, Chengwu ^{[3
]}

Huang, Jian ^{[3
]}

机构：

[1] Univ Shanghai Jiao Tong, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

[2] Baoshan Iron & Steel Co Ltd, Res Inst, R&D Ctr, Shanghai 201900, Peoples R China

[3] Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China

来源：

MATERIALS LETTERS | 2021年 / 287卷

关键词：

QP steel; CMT; Welding; Microstructure; Softening;

D O I：

10.1016/j.matlet.2020.129282

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

QP1180 lap joints are welded by the cold-metal-transfer method. The microstructure and softening of the welded joints are investigated. The results show that the fusion zone is composed of acicular ferrite and as hard as the base metal. The hardness of the supercritical heat-affected-zone (HAZ), where martensite is the main phase, is much higher than that of the base metal. Softening takes place in part of the intercritical HAZ and the whole subcritical HAZ. In intercritical HAZs, fresh martensite forms, while the size and amount of austenite are similar to those in the base metal. The hardness in the subcritical HAZ decreases due to the tempering effect. Austenite starts to decompose in the subcritical HAZ, where the hardness drops from 380 to 390 HV. However, in the softest place of the subcritical HAZ, the austenite phase almost disappears, and the hardness drops to approximately 320 HV. (C) 2020 Published by Elsevier B.V.

引用

页数：4

共 10 条

[1]

Diniz P., 2020, Unisanta Sci. Technol, V8, P105

[2] Microstructure and mechanical properties of fiber laser welded QP980 steel [J].

Guo, Wei ;

Wan, Zhandong ;

Peng, Peng ;

Jia, Qiang ;

Zou, Guisheng ;

Peng, Yun .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2018, 256 :229-238

[3]

Matkowski N.J., 2014, ARCH MAT SCI ENG, V70, P77

[4] Microstructure-mechanical properties relationships for quenching and partitioning (Q&P) processed steel [J].

Seo, Eun Jung ;

Cho, Lawrence ;

Estrin, Yuri ;

De Cooman, Bruno C. .

ACTA MATERIALIA, 2016, 113 :124-139

[5] Carbon partitioning into austenite after martensite transformation [J].

Speer, J ;

Matlock, DK ;

De Cooman, BC ;

Schroth, JG .

ACTA MATERIALIA, 2003, 51 (09) :2611-2622

[6]

Uchihara M., 2002, WELD WORLD, V46, P41, DOI [10.1007/BF03263389, DOI 10.1007/BF03263389]

[7]

WEBSTER D, 1968, ASM TRANS Q, V61, P816

[8] The effect of morphology on the stability of retained austenite in a quenched and partitioned steel [J].

Xiong, X. C. ;

Chen, B. ;

Huang, M. X. ;

Wang, J. F. ;

Wang, L. .

SCRIPTA MATERIALIA, 2013, 68 (05) :321-324

[9]

Xuejun L., 2019, CHIN J LASER, V46, P72, DOI [10.13251/j.issn.0254-6051.2017.01. 021, DOI 10.13251/J.ISSN.0254-6051.2017.01.021]

[10] Microstructure evolution and mechanical behavior of ultrafine Ti-6Al-4V during low-temperature superplastic deformation [J].

Zherebtsov, S. V. ;

Kudryavtsev, E. A. ;

Salishchev, G. A. ;

Straumal, B. B. ;

Semiatin, S. L. .

ACTA MATERIALIA, 2016, 121 :152-163

← 1 →