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选用三种不同形式的激光表面强化处理工艺对86CrMoV7钢样品表面进行处理,对其处理层的组织特征及其磨粒磨损行为进行了一定的分析与探讨。结果表明,处理后的86CrMoV7钢样品表面性能有不同程度的提高,在本实验条下,表面熔敷,快速熔凝及相变硬化处理层的显微硬度比基体硬度分别提高了Hm 5880、5195和3625(MPa)。分析处理层表面硬度及耐磨性提高的主要原因是:晶粒组织细化,混合型细针马氏体强化及颗粒状碳化物弥散强化;得到超细柱状晶沿垂直于表面方向伸延;发现在快速熔凝层组织中存在Cr7C3型碳化物(Cr,Fe,V)_7C3呈超细颗粒弥散分布。处理层磨粒磨损失效的主要特征是逐步显微切削。
The surface of 86CrMoV7 steel was treated by three different forms of laser surface strengthening process. The microstructure and wear behavior of the treated layer were analyzed and discussed. The results showed that the surface properties of the treated 86CrMoV7 steel increased to different extents. Under the experimental conditions, the microhardness of the surface deposited, rapidly fused and phase-change hardened layers were higher than that of the matrix respectively. Hm 5880,5195 And 3625 (MPa). The main reasons for the increase of surface hardness and wear resistance of the analysis and treatment layer are as follows: the grain refinement, the fine needle-mixed martensitic strengthening and the granular carbide dispersion strengthening; the ultrafine columnar crystals are elongated along the direction perpendicular to the surface; Cr7C3 carbides (Cr, Fe, V) _7C3 were present in the rapidly-fusing layer as ultrafine particles. The main characteristic of wear layer wear failure is the gradual micro-cutting.