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Microstructure and mechanical properties of fiber laser welded joints of ultrahigh-strength steel 22MnB5 and dual-phase steels

Published online by Cambridge University Press:  08 October 2014

Jin Jia*
Affiliation:
College of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
Shang-Lei Yang
Affiliation:
College of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; and Shanghai Research and Development Center for Key Technologies of Intelligent Equipments of Ultra-intense Laser Processing (Shanghai University of Engineering Science), Shanghai 201620, China
Wei-Yuan Ni
Affiliation:
College of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
Jian-Ying Bai
Affiliation:
College of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
*Corresponding
a)Address all correspondence to this author. e-mail: yzjiajin@126.com
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Abstract

This study was to analyze the microstructure, microhardness, tensile and fatigue performance of the welded joints performed by a fiber laser on 22MnB5 and dual-phase steels (DP590, DP980) in similar and dissimilar combinations. The result shows that the weld zone (WZ) basically consisted of lath martensite. The HAZ in these steels can be divided into 3 parts: quenched, incomplete quenched, and tempered region. The WZ had the highest hardness, and a soft zone existed in the HAZ of all steels. Inside the WZ of the dissimilar welded joints, two hardness subregions were observed due to the difference in the alloying elements of these steels. Tensile specimens of the 22MnB5–22MnB5 and 22MnB5–DP980 welded joints were all broken in HAZ, while the 22MnB5–DP590 welded joints failed in the DP590 base metal (BM). The BM had a higher fatigue life than the welded joints, and the fatigue failure of the 22MnB5 similar and 22MnB5–DP980 dissimilar welded joints respectively occurred in the HAZ and DP980 BM. The fatigue fracture contained 3 parts: crack initiation, crack propagation, and the final fast fracture region.

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Copyright
Copyright © Materials Research Society 2014 

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Microstructure and mechanical properties of fiber laser welded joints of ultrahigh-strength steel 22MnB5 and dual-phase steels
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