Modified inherent strain method coupled with shear strain and dynamic mechanical properties for predicting residual deformation of Inconel 738LC part fabricated by laser powder bed fusion

Laser powder bed fusion (LPBF) involves complex physical phenomena, and using traditional simulation methods for residual deformation prediction often results in high computational costs. Multiscale modeling theory is a viable approach to address this challenge, and the modified inherent strain method (MISM) can accurately represent the residual deformation of the part while maintaining computational efficiency. This study proposes an MISM coupled with shear strain (SS) and dynamic mechanical properties (DMP), which successfully captures the asymmetric phenomena for the Inconel 738LC part and reflects the heating and cooling cycles of the part. Experimental results and simulation predictions are in good match, verifying the accuracy of the model. Compared to traditional MISM, this model significantly reduces the overall average deformation prediction error from 15.4 % to 6.9 %. Furthermore, the influence of process parameters on part deformation was investigated. The findings suggest that both laser power and scanning speed exert considerable influence on deformation.