Abstract
GTD-450 is a new type of maraging stainless steel. It has a wide application prospect in the additive manufacturing of complex components such as GTD-450 compressor blades using L-PBF technology. In this study, a multi-scale numerical model was used to simulate the whole process of L-PBF forming of GTD-450 stainless steel block. This numerical model can describe the evolution process of L-PBF forming temperature field, melt flow field and melt free surface. With the help of simulation results, the surface morphology of GTD-450 stainless steel formed under different layers is clarified. The experimental and numerical data of surface morphology are in good agreement, which verifies the reliability of the numerical model. Based on the experimental results, the influence mechanism of melt pool behaviour and thermal history on melt solidification behaviour was discussed, and the development process of L-PBF block surface morphology under the influence of melt pool behaviour was explained.
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