Influences of B4C on Microstructure and Mechanical Properties of Austenitic Hardfacing Layer Enhanced by Autogenous Particles
In order to improve the hardfacing layer of high manganese steel under low load wear resistance,a certain volume of graphite and carbonization boron was added into D256 electrode medicine skin and fixing ferrotitanium,ferrovanadium and rare earth content.Due to welding metallurgy reaction,the wear resistance of reinforcing particles in high manganese steel hardfacing layer can be improved by generating boron carbide and carbon,the mechanical properties of the hardfacing layer with abrasion tester,such as XJL-type 2 metalloscope,HR-150A type los hardometer,M-200 type instruments,were studied.The results show that the microstructure of the hardfacing layer with boron carbide is mainly composed of austenitic+carbide.When the boron carbide is 6%,the refinement level of austenitic grain is best.The microhardness can reach 56 HRC,the microhardness of the fusion zone is 8HRC higher than the welding rod with graphite,the wear resistane is better than the latter.