Analysis and forecast of fatigue crack propagation behavior in HAZ of X80 pipeline steel by welding thermal simulation

doi:10.13251/j.issn.0254-6051.2020.12.036

Abstract

Abstract: Fatigue crack propagation behavior in each heat affected zone (HAZ) of X80 dual-phase pipeline steels was investigated by using welding thermal simulation. The differences of the fatigue cracks propagation behavior between real welded and welding thermal specimens were also analyzed. And the feasibility on the prediction of fatigue cracks propagation life for applying welding thermal simulation was discussed. The results show that there is an obvious contrast between the fatigue crack growth rate curves (da/dN-DK curves) of the real welded and welding thermal specimens when the cracks are propagated in the CGHAZ and ICHAZ, which are attributed to variations of the microstructure change, thus leading to the change of cracks propagation resistance. Therefore, it is recommended to predict the fatigue crack propagation life through the da/dN-DK curve of integrated HAZ in the real welded specimens.

Key words: welding thermal simulation, heat affected zone, fatigue crack propagation, X80 pipeline steel

CLC Number:

TG441

Xu Pengfei, Zhao Zuopeng, Cheng Hongxia, Xiao Furen. Analysis and forecast of fatigue crack propagation behavior in HAZ of X80 pipeline steel by welding thermal simulation[J]. Heat Treatment of Metals, 2020, 45(12): 184-188.

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