Acta Metallurgica Sinica (English Letters) ›› 2013, Vol. 26 ›› Issue (3): 333-339.DOI: 10.1007/s40195-012-0163-8

Previous Articles     Next Articles

Prediction of the Residual Welding Stress in 2.25Cr-1Mo Steel by Taking into Account the Effect of the Solid-State Phase Transformations

Dean DENG1,2), Yangang TONG1), Ninshu MA3), Hidekazu MURAKAWA3)   

  1. 1) College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China
    2) State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
    3) JWRI, Osaka University, 11-1, Mihogaoka,Ibaraki, Osaka 567-0047, Japan
  • Received:2012-09-17 Revised:2013-01-16 Online:2013-06-25 Published:2013-05-06
  • Contact: Dean DENG
  • Supported by:

    Open-Fund Research of State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, China and the Fundamental Research Funds for Central University (No. CDJZR12130036).

Abstract:

A computational approach based on the thermal elastic plastic finite element method was developed for predicting welding residual stress in low carbon alloyed steel welds by taking into account the effect of the solid-state phase transformations. The kinetics of phase transformations was described by Johnson Mehl Avrami Kolmogrov (JMAK) equation for bainitic transition and by Koistinen-Marburger (K-M) relationship for martensitic transition. Moreover, an additive rule depending on volumetric phase fraction was adopted to represent the material property changes during heating and cooling. Consequently, the residual welding stresses in a 2.25Cr1Mo steel TIG welded plate were computed. Early calculation results suggest that the bainitic and martensitic transformations took place in the weld the heat-affected zone drastically reduce the residual longitudinal tensile stress in the region.

Key words: Computational approach, Numerical simulation, Phase transformation, Welding residual stress