Effect of Temper on Deformation and Mechanical Behaviors of Laser Melt-Deposited 12CrNi2 Low-Alloy Steel

摘要

The effect of tempering (673 K for 30 min) on the microstructure and tensile properties of laser melt-deposited (LMD) 12CrNi2 low-alloy steel is studied. The results show that LMD 12CrNi2 mainly consists of the ferrite and some Cr23C6 carbides. Characterization of the Schmid factor near the fracture surface shows that after tempering, the slip system with the largest Schmid factor is still {123} , but the Schmid factor of {100} and {112} slip systems increases. Tempering increases the elongation from 6.97 to 11.49% and the tensile strength from 849 to 951 MPa. Tempering increases the average distribution of misorientation between crystals after tensile test, which improves the average dislocation density and promotes strengthening.