Effect of tensile stress annealing on residual stress and strength of C19400 alloy

Abstract

The influence mechanism of tensile stress and tensile stress annealing on the strength and residual stress of the C19400 alloy is proved. The results show that after annealing at 100 °C under 35 MPa tensile stress, the tensile strength is 428.2 MPa, and the TD and RD residual stresses are −2 MPa and −8 MPa, respectively, which are 94.4% and 87.9% lower than that of the untreated state. This treatment can significantly reduce the residual stress of the C19400 alloy while maintaining its original tensile strength. The main factor affecting strength is the interaction between the precipitates and dislocations. Interestingly, the tensile stress has not no obvious relationship with the overall texture strength, but is positively related to the volume fraction of Brass texture. In addition, this study find that under the same level of dislocation density, no direct correlation exists between the magnitude of the residual stress and that of dislocation density. The ordered arrangement of dislocations is conducive to reducing the residual stress of the alloy. The results provide a reference for improving the performance of C19400 alloy.