Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Study on the Prediction Modeling of Phase Transformation in the CGHAZ of Structural Steel Weld

구조용강 용접부 CGHAZ의 상변태 예측 Modeling에 관한 연구

  • Published : 1998.06.01
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Abstract

The microstructures of the HAZ (Heat Affected Zone) are generally different from the base metal due to rapid thermal cycle during welding process. Particuraly, CGHAZ (Coarsened Grain Heat Affected Zone) near the fusion line is the most concerned region in which many metallurgical and mechanical discontinuities have been normally generated. A computer program by the numerical formularization of phase transformation during cooling with different rates was developed to generate the CCT diagram, and to predict microstructural (phase) changes in the CGHAZ. In order to verify simulated results, isothermal and continuous cooling transformation experiments were conducted. The simulated and experimental results showed that the developed computer model could successfully predict the room temperature microstructural changes (changes in volume fraction of phases) under various welding conditions (heat input & cooling rate $(Δt_{8/5})$).

Keywords

References

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