Study on microstructure and mechanical properties of laser repaired layer of 2Cr13 turbine blade

2Cr13 turbine blades were repaired by laser direct metal deposition (DMD) forming. The microstructure and mechanical properties of laser-repaired layer (LRL) were examined. The microstructure was observed by optical microscope and phase was analyzed by XRD. The mechanical properties such as microhardness, wear resistance and tensile strength of LRL were studied as well. The results show that the microstructure of LRL is thin fir-tree crystal, and the microhardness of the specimens distributed from 350HV
_0.2
to 500HV
_0.2
. The wear resistance increased one time than that of 2Cr13 substrate. The ultimate tensile strength for LRL was comparable to that of the substrate, which increased by 75% than the substrate. The porosities and microcracks in LRL specimen were successfully eliminated by using DMD forming.