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利用MMU-10试验机,在0.13 m/s的速度下,分组对20CrNi2Mo盘环对摩试样进行100、120、150 N接触载荷下的干滑动摩擦磨损试验。采用SEM、EDS、EBSD表征摩擦磨损后环试样表面和截面的形貌及元素。结果表明,接触载荷为150 N时摩擦因数最低、磨损量最大。摩擦热导致磨损表面出现严重的氧化和脱落材料焊结现象,磨损机制由氧化磨损、磨粒磨损和黏着磨损构成。磨损导致了次表层组织变化,出现严重塑性形变层和马氏体形变层。截面EBSD分析结果反映了表层至次表层的应变,EBSD菊池花样质量从表面朝深度方向逐渐提升,采用EBSD图像分割处理及Band Contrast平均值求解可准确找出磨损导致的形变层终止区域。
Using the MMU-10 testing machine, the dry sliding friction and wear tests of 20CrNi2Mo were carried out in groups of 100, 120 and 150 N under the contact load of 0.13 m / s. SEM, EDS and EBSD were used to characterize the morphology and elements of the surface and cross-section of ring samples after friction and wear. The results show that when the contact load is 150 N, the friction coefficient is the lowest and the wear amount is the largest. Frictional heat causes severe oxidation and ablation of the material on the wear surface. The wear mechanism consists of oxidative wear, abrasive wear and adhesive wear. Abrasion led to sub-surface tissue changes, severe plastic deformation layer and martensitic deformation layer. The results of EBSD cross-section reflect the strain from surface to subsurface. The quality of EBSD kikuchi pattern gradually increases from the surface to the depth. The EBSD image segmentation and the average of Band Contrast are used to find out exactly the ending zone of strain zone caused by wear.