Microstructure and wear property of Fe-Mn-Cr-Mo-V alloy cladding by submerged arc welding

摘要

A wear resistant Fe-Mn-Cr-M-V alloy cladding was deposited on SM45C (equivalent to AISI1045) substrate by automatic submerged arc welding using stoody 105 alloy wire. Microstructure and surface hardness of the cladding were investigated and measured on samples prepared under different welding conditions. The results showed that the retained austenite in the cladding increases with the increased welding current and reduced travel speed. The wear behavior of the clad was studied using ball-on-disk tribometer. Wear mechanism was analyzed based on the analysis of the worn surfaces both the clad and ball by scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS). The scanning electron microscopic examination of the worn surface shows that a layer of oxide film forms on the worn surface. Oxidation wear mechanism controls the wear process. The spalling of the oxide was caused by the repeated rubbing fatigue mechanism.