Experimental and Computational Analysis of Residual Stress and Mechanical Hardening in Welded High-Alloy Steels

摘要

Due to the thermal cycle during welding, plastic deformation can occur in the heat-affected zone. After cooling, the yield stress can be locally increased due to the hardening effect and thus permits higher residual stresses in these areas. Therefore, a precise description of the hardening behavior in welding simulations is indispensable for reliably predicting residual stresses. Thus, this work is dedicated to the characterization of mechanical hardening in welded high-alloy steels and its effects on the residual stress state. Numerical welding simulations are performed using different hardening models and the outcomes in terms of both the residual stress and the hardening state are compared to experimental results gained by laboratory X-ray and neutron diffraction.