超高锰钢/TiC复合锤头的界面组织及磨损行为OA

Through microstructure characterization,hardness testing,impact and friction-wear experiments,the interfacial microstructure characteristics of ultra-high manganese steel/TiC composite hammer heads after service failure were analyzed,and a systematic study was conducted on the wear behaviors of the ultra-high manganese steel matrix of the hammer heads.The results demonstrate that the ultra-high manganese steel matrix consists of a single-phase austenite structure(grain size:700-850 μm)with complex Cr-Mn-Fe carbides being distributed along grain boundaries and within grains,and no significant microstructural characteristics changes are observed before and after service.Although a diffusion layer enriched with Mn and Cr elements formed at the interface between the ultra-high manganese steel and the TiC cemented carbide,but the transverse cracks initiate at this interface after actual service and propagate into the TiC cemented carbide region.A hardened layer of about 2 mm thickness is formed due to work-hardening on the surface of the hammer head after service,and its wear mechanism is not same with the friction-wear,but is similar with the impact-wear,being the synergistic effects of plastic deformation and fatigue wear mechanisms.