回火处理对等离子熔覆W6Mo5Cr4V2高速钢组织和硬度的影响OA

The thrust ring is the core component of the axial positioning of axial parts.During service,it is necessary to withstand axial forces,limit axial displacement and ensure the construction of the oil film.However,it is prone to wear and ablation due to violent wear of the end face.Frequent replacement increases operation and maintenance costs.Improving its hardness is a key way to enhance wear resistance and thus extend service life.42CrMo steel is widely used in the manufacture of thrust rings due to its advantages such as high strength and high toughness,but has low surface hardness and poor wear resistance,so it needs to be improved through surface strengthening technology.Plasma cladding technology has low operation costs and high efficiency,and could prepare high-bound strength cladding layers and facilitate repair of failed parts.W6Mo5Cr4V2 high-speed steel join high toughness and excellent wear resistance,and the combination has good application prospects.This study uses 42CrMo steel thrust ring as the substrate and clad 2-layer W6Mo5Cr4V2 high-speed steel by plasma arc,and then conducts primary and secondary tempering of 550℃ × 1h and analyze its microstructure evolution,phase,element distribution and hardness.The results show that the clad layer contains α-Fe、α'-Fe and a variety of carbides.After tempering,the carbide size and density increase and particulate-like carbides are dispersed.The hardness of the clad layer is significantly higher than that of the substrate,and the hardness after secondary tempering reaches 64.3HRC(increase by 142％),which provides a referenceable technical solution for the life-extending design of the thrust ring under high wear-resistant environment conditions.