The size of austenite grain has significant e®ects on components and proportions of various ferrites in low-alloy steel weld metal. Therefore, it is important to determine the size of austenite grain in the weld metal. In this paper, a model based upon the carbon diffusion rate is developed for computing austenite grain size in low-alloy steel weld metal during continuous cooling. The model takes into account the effects of the weld thermal cycles, inclusion particles and various alloy elements on the austenite grain growth. The calculating results agree reasonably with those reported experimental observations. The model demonstrates a significant promise to understand the weld microstructure and properties based on the welding science.
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