Microstructure and Wear Resistance of Laser Cladded Co-based Superalloy Coating
Co-based superalloy coating was prepared on the stainless steel surface by laser cladding. The microstructure, phase constitutes and worn surface morphology of the coating were characterized by optical microscope, scanning electron microscope (SEM) with energy dispersive spectrum (EDS) and X-ray diffraction (XRD). The ambient temperature sliding friction and wear property of the coating was also tested. The experiments results showed that: the microstructures of the Co-based superalloy coating are cellular crystal- coarse dendrite - tiny dendrite in turn from bottom to surface, which consists of y-Co solid solution, Fe2Mo and Co7Mo6. The average micro-hardness of the laser cladding is 632 HV, which is 2 times higher than that of 304 stainless steel matrix. The ambient temperature sliding friction and wear property of the laser cladding is about 1-1.5 times in contrast to that of 304 stainless steel matrix. The better wear resistance of the coating is contributed to solution strengthening of Mo, as well as dispersion strengthening of Fe2Mo and Co7Mo6 hard phases. The failure mechanisms of the coating are pitting fatigue abrasion and grain-abrasion.
laser cladding Co-based superalloy wear resistance grain-abrasion
Ma Wenyou Lu Cheng Liu Min Chen Xingchi Tong Xin Lu Cheng Li Fuhai
Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650,China
国际会议
西安
英文
97-99
2011-05-11（万方平台首次上网日期，不代表论文的发表时间）