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Study on High-Cycle Shear Fatigue Behavior of Two Kinds of Spot-Welded 980 Mpa Ultra-High-Strength Steels

  • Zhang Ding
  • Yang Bing
  • X. G. Qin
  • J. C. Duan
  • W. C. Huang
  • Zhang Mao
  • Qin Liang
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 486)

Abstract

DP980 and QP980 steels are chosen to evaluate their properties of welded spot under high-cycle shear fatigue test. Samples are analyzed by OM and SEM after fatigue test. It was observed that QP980 steel has a better performance of anti-high-cycle fatigue fracture at the same welding parameters. Both fatigue cracks of two kinds of welded spot initiate from the end of pre-cracks between two base materials, and better anti-high-cycle fatigue performance of spot-welded QP980 are found due to higher initiation difficulty of fatigue cracks which has some connections with higher hardness of martensite in this area.

Keywords

UHSS RSW Shear fatigue test Crack initiation Crack propagation 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Zhang Ding
    • 1
  • Yang Bing
    • 1
  • X. G. Qin
    • 1
  • J. C. Duan
    • 1
  • W. C. Huang
    • 1
  • Zhang Mao
    • 1
  • Qin Liang
    • 1
  1. 1.Dongfeng Motor Corporation Technical CenterWuhanChina

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