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Welding in the World

, Volume 62, Issue 5, pp 961–971 | Cite as

Effect of heat input and heat treatment on microstructure and mechanical properties of welded joint of TMCP890 steel

  • Yun Peng
  • Yuanjie Zhang
  • Lin Zhao
  • Chengyong Ma
  • Zhiling Tian
Research Paper
  • 158 Downloads

Abstract

The microstructure and mechanical properties of welded joint of TMCP890 are studied by means of thermal simulation and gas metal arc welding. It is found that the heat-affected zone has high toughness after welding. After welding with 900-MPa grade filler wire, the weld metal has good toughness and the strength of welded joint is comparable to that of the steel. Two hundred fifty degrees celsius postweld heat treatment does not affect the strength and toughness of welded joint. After 480 °C postweld heat treatment, the strength is a little lowered and toughness of weld metal and heat-affected zone is reduced remarkably. After 600 °C postweld heat treatment, the strength and toughness of weld metal and heat-affected zone are damaged seriously. Light optical microscope, SEM, TEM, and EBSD are used to analyze the microstructure of experimental samples. It is found that filmy residual austenite and low quantity of M-A constitutes with small size contribute to the high toughness of heat-affected zone in a great deal. The adverse effect of high-temperature postweld heat treatment on toughness is because of the large-sized precipitated particles.

Keywords

890 MPa TMCP steel Welded joint Postweld heat treatment Microstructure Mechanical properties 

Notes

Funding information

This research was supported by National Key R&D Program of China (Grant No. 2017YFB0304700) and International Science & Technology Cooperation Program of China (Grant No. 2015DFA51460).

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Copyright information

© International Institute of Welding 2018

Authors and Affiliations

  • Yun Peng
    • 1
  • Yuanjie Zhang
    • 2
  • Lin Zhao
    • 1
  • Chengyong Ma
    • 1
  • Zhiling Tian
    • 1
  1. 1.Central Iron & Steel Research InstituteBeijingChina
  2. 2.Xinyu Iron & Steel Co. LtdXinyuChina

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