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Microstructure and Fatigue Properties of Laser Welded DP590 Dual-Phase Steel Joints

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Abstract

In this paper, cold-rolled DP590 dual-phase steel sheets with 1.5 mm thickness were butt-welded by a fiber laser, and the evolution and effect on microhardness, tensile property and fatigue property of the welded joint microstructure were studied. The results showed that the base metal is composed of ferrite and martensite, with the martensite dispersed in the ferrite matrix in an island manner. The microstructure of the weld zone was lath-shaped martensite that can be refined further by increasing the welding speed, while the heat-affected zone was composed of ferrite and tempered martensite. The microhardness increased with increasing welding speed, and the hardness reached its highest value—393.8 HV—when the welding speed was 5 m/min. Static tensile fracture of the welded joints always occurred in the base metal, and the elongation at break was more than 16%. The conditional fatigue limits of the base metal and the weld joints were 354.2 and 233.6 MPa, respectively, under tension–tension fatigue tests with a stress rate of 0.1. After observation of the fatigue fracture morphology, it was evident that the fatigue crack of the base metal had sprouted into the surface pits and that its expansion would be accelerated under the action of a secondary crack. The fatigue source of the welded joint was generated in the weld zone and expanded along the martensite, forming a large number of fatigue striations. Transient breaking, which occurred in the heat-affected zone of the joint as a result of the formation of a large number of dimples, reflected the obvious characteristics of ductile fracture.

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Acknowledgments

This project is sponsored by the Shanghai Natural Science Foundation of China (Grant No. 14ZR1418800) and the Shanghai Automotive Industry Science and Technology Development Foundation (Grant No. 1404) of China. These supports are gratefully acknowledged.

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Authors and Affiliations

  1. College of Materials Engineering, Shanghai University of Engineering Science, Shanghai, 201620, People’s Republic of China

    Chaojie Xie, Shanglei Yang, Haobo Liu, Qi Zhang, Yaming Cao & Yuan Wang

  2. Shanghai Research and Development Center for Key Technologies of Ultra-Intense Laser Processing, Shanghai University of Engineering Science, Shanghai, 201620, People’s Republic of China

    Shanglei Yang

  3. Institute of Laser Industrial Technology, Shanghai University of Engineering Science, Shanghai, 201620, People’s Republic of China

    Shanglei Yang

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  1. Chaojie Xie
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  2. Shanglei Yang
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  3. Haobo Liu
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  4. Qi Zhang
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  5. Yaming Cao
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  6. Yuan Wang
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Correspondence to Shanglei Yang.

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Xie, C., Yang, S., Liu, H. et al. Microstructure and Fatigue Properties of Laser Welded DP590 Dual-Phase Steel Joints. J. of Materi Eng and Perform 26, 3794–3801 (2017). https://doi.org/10.1007/s11665-017-2848-7

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  • DOI: https://doi.org/10.1007/s11665-017-2848-7

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