Research on Wear Resistance and Organizational Structures of Coating Alloyed by Laser with Chromium,Molybdenum and Boron
To improve the 45 steel's wear resistance,chromium,molybdenum and boron were alloyed on 45 steel by CO2 laser to obtain excellent wear resistance composite coating.The organizational structure and wear resistance of the alloying layer were characterized by SEM,XRD,EDS,HVS-1000 micro-hardness tester and MMS-2A screen displayed friction tester.The experimental results indicated that the organizational structure of the alloying layer is principally cell crystal.The high hardness carbides formed by in-situ are distributed in cell crystal.The highest micro-hardness value of the alloying layer is 860 HV,which is nearly three times of substrate and the average wear resistance of the alloying layer also is approximately three times of substrate.