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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 2/2016

12-01-2016

Microstructure- and Strain Rate-Dependent Tensile Behavior of Fiber Laser-Welded DP980 Steel Joint

Authors: Qiang Jia, Wei Guo, Peng Peng, Minggao Li, Ying Zhu, Guisheng Zou

Published in: Journal of Materials Engineering and Performance | Issue 2/2016

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Abstract

DP980 steels were butt-welded by fiber laser welding. The microstructures, microhardness distribution, and tensile behavior of the joint were investigated. The results showed that the fusion zone (FZ) consisted of fully martensite with higher hardness compared to the base metal (BM). A softened zone (20 HV0.2 drop) was produced in heat-affected zone due to martensite tempering during the laser welding. The ultimate tensile strength (UTS) and yield strength (YS) of the laser-welded joint were not degraded compared to BM with the existence of softened zone. The UTS and YS of the welded joint increased with the increase of tensile strain rate. The work hardening exponents of the BM and welded joint showed weak positive strain rate dependence. The deformation of softened zone was restrained by the hardened FZ during loading, resulting in a higher work hardening rate of softened zone than that of BM. The failure of welded joint occurred in the BM instead of softened zone. The fracture surfaces of the joint exhibited typical ductile fracture over strain rate from 0.0001 to 0.1 s−1.
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Metadata
Title
Microstructure- and Strain Rate-Dependent Tensile Behavior of Fiber Laser-Welded DP980 Steel Joint
Authors
Qiang Jia
Wei Guo
Peng Peng
Minggao Li
Ying Zhu
Guisheng Zou
Publication date
12-01-2016
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 2/2016
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-015-1864-8

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