For high energy beam plasma arc

the thermal stress can be formed in the deposition layers due to the alternate heating-cooling during moving deposition

which can result in the creation of hot crack as a result of high residual stress after cooling.It is important to investigate the effects of scanning rate of stress field during plasma powder deposition and cooling conditions on hot crack.The heat transferring in plasma powder deposition is simulated by the finite element method.The thermal stress field in plasma powder deposition has been calculated through varying scanning rate according to the features of superalloy.The results reveal that with increasing scanning rate

the peak value of thermal stress can be decreased and the stress field can be more uniformly distributed

leading to the lower residual stress after cooling.