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JWJ > Volume 25(1); 2007 > Article
Journal of KWJS 2007 February;25(1) :42-48.
Published online March 26, 2007.
A Study on the Prediction of Shrinkage and Residual Stress for the HY-100 Weldment Considering the Phase Transformation
Hee-Tae Lee, Sang-Beom Shin

Correspondence:   Published online March 26, 2007
ABSTRACT
  For high performance and structural stability, aplication of high strength steel has continuously increased. However, the change of the base metal gives rise to problems with the acuracy management of the welded structure. It is atributed to the martensite phase transformation of the high strength low alloy steel weldment. The purpose ofthis study is to establish the predictive equation of transverse shrinkage and residual stres for the HY-100 weldment. In order to do it, high speed quenching dilatometer tests were performed to define a coeficient of thermal expansion (CTE) at the heating and cooling stage of HY-100 with various cooling rates. Uncoupled thermal-mechanical finite element (FE) models with CTE were proposed to evaluate the efect of the martensite phase transformation on transverse shrinkage and residual streses at the weldment. FEA results were verified by comparing with experimental results. Based on the results of extensive FEA and experiments, the predictive equation of transverse shrinkage and longitudinal shrinkage force at the HY-100 weldment were formulated as the function of welding heat input/in-plane rigidity and welding heat input respectively.
Keywords: HY-100;Phase transformation;Transverse shrinkage;Residual stres;Heat intensity;Finite element analysis(FEA)
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