상변태를 고려한 탄소강 용접부의 잔류응력 해석에 관한 연구

A Study on the Analysis of Residual Stress in Weldment by Considering the Phase Transformation of Carbon Steel

  • 발행 : 2001.03.01


Welding process generates distortion and residual stress in the weldment due to rapid heating and cooling. Welding distortion and residual stress in the welded structure result in many troubles such as dimensional inaccuracies in assembling and safety problem during service. The accurate prediction of welding residual stress is thus very important to improve the quality of weldment and find the way to reduce itself. This paper suggests new analysis method to predict welding residual stress by considering solid phase transformation during welding process. Using the method, analysis is performed for medium and low carbon steel. The analysis result for medium carbon steel reveals that case considering phase transformation has compressive residual stress in contrast with the case neglecting phase transformation because of martensite formation. However, for the case of low carbon steel, residual stress shows little difference between the case considering phase transformation and the other case, because it has small transformation strain and recovers rapidly stress after phase transformation.


상변태;유한요소법;잔류응력;Gas Tungsten Arc, 가스텅스텐 아크;펄라이트;페라이트;마르텐사이트;오스테나이트


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