Prediction of mechanical properties of LPBF built part based on process monitoring and Gaussian process regression

Abstract

As a highly promising technology in additive manufacturing, the laser powder bed fusion (LPBF) has only limited application due to its low reproducibility. In this study, the image information of the 316L specimen after laser scanning and powder paving of each layer was acquired by a CMOS industrial camera. The important features were selected,extrated and quantificated by analyzing the tensile test results. Finally,combined with the laser power, the quantified features were as input of a Gaussian process regression model based on optimisation algorithm of grid search to predict the tensile strength of 316L specimen. The results show that the quantized image features have a significant improvement on the regression effect, and the coefficient of determination(R²) is improved from 63% to 90.57% compared to using only the laser power as input.