Prediction of part distortion in metal 3D printing = Dự đoán biến dạng chi tiết khi in 3D kim loại.

Abstract

The 3D printing of metallic parts is widely applied for industrial applications. However the quality issues of the printed parts including part distortion, as well as cracks caused by high temperature and fast cooling, result, in high residual stress. This is a challenge that limits industry acceptance of 3D printing. this research proposes an inherent strain-based part deformation prediction method. To determine the inherent strain (IS) value, a micro-scale model for analyzing the temperature distribution is constructed. The IS value is calculated from the temperature gradient. Then, this IS value is used for determining the part deformation. The proposed methodology has been developed and evaluated, using the 316L stainless steel cantilever beam printed by SLM.