Title :
Study on microstructure and mechanical properties of laser repaired layer of 2Cr13 turbine blade
Author :
Ligang Zhu ; Jianhua Yao ; Zhengqiang Zhou ; Kovalenko, V.S.
Author_Institution :
Key Lab. of Special Purpose Equip. & Adv. Process. Technol., Zhejiang Univ. of Technol., Hangzhou, China
Abstract :
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 350HV0.2 to 500HV0.2. 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.
Keywords :
X-ray diffraction; blades; coating techniques; crystal microstructure; forming processes; laser beam applications; maintenance engineering; microcracks; microhardness; optical microscopes; substrates; tensile strength; turbines; wear resistance; 2Cr13 turbine blade; Cr; XRD; laser direct metal deposition forming; laser repaired layer; mechanical properties; microcracks; microhardness; microstructure properties; optical microscope; porosities; substrate; thin fir-tree crystal; ultimate tensile strength; wear resistance; Laser direct metal deposition; Microstructure; Repairing; Tensile strength; Turbine blade;
Conference_Titel :
Responsive Manufacturing - Green Manufacturing (ICRM 2010), 5th International Conference on
Conference_Location :
Ningbo
DOI :
10.1049/cp.2010.0411
