Influence of oxidation on wear resistance of WC/Cu-Ni-Mn surfacing layers

Surfacing welding method was carried out to fabricate WC particles reinforced Cu-Ni-Mn surfacing layer on steel substrates.Through wear performance test and wear surface analysis of the surfacing layer at 350 ℃,the wear mechanisms were uncovered. The research result showed that the strengthening phase of the surfacing layer appeared much better hardness (2 436 HV0. 2) than Fe-Cr-C surfacing layer. The wear resistance of the surfacing layer at 350 ℃ decreased slightly compared with that at room temperature,and the wear volume increased by 4. 95%,which was lower than that of Fe-Cr-C surfacing layer by 10. 88%. Compared with room temperature,the dynamic friction coefficient of the sample was significantly reduced at 350 ℃,the value of which was about 0. 1. The wear mechanism also included oxidation. The wear surface was smoother and there was a large amount of oxygen,and oxide glaze layer was formed on the wear surface. Consequently,the high temperature self-lubricating property of the Cu-Ni-Mn substrate was fully exerted,which effectively protected the surfacing layer. Since softening would play a dominant role at 350 ℃,the wear volume increased instead.