This paper proposes a nonlinear elastoplastic model and uses the finite element method to study the
thermal residual stress in 3D-Cf / Mg and its modification after different treatments. Then an experimental investigation
was realized by XRD, which indicates the influences of different treatments on thermal residual stress. The result
shows that after a cold-treatment at -196益, the average thermal residual stress can decrease from 169. 06 MPa to
55. 29 MPa, while the thermal residual stress changes little after a heat鄄treatment. This calculating result agrees well
with the experimental results and proves that the cold鄄treatment can reduce the thermal residual stress in 3D-Cf / Mg.