Purpose

This study aims to investigate the influence of surface roughness and viscosity on micropitting and their influence sequence.

Design/methodology/approach

Specimens were made of carburized and quenched 18CrNiMo7-6, and different surface roughness was obtained by grinding and shot peening. Tests were carried out on a rolling-sliding tribometer, with different viscosity lubricants and a heavy load under a boundary lubrication condition. The laser confocal microscope was used to measure the aspects, surface roughness, profiles in the contacted region and micropitting damage percentage. A factorial experiment was designed, and the range analysis was applied to find the sequence of influence of surface roughness and viscosity.

Findings

The result shows that surface roughness has a more noticeable influence since the change of viscosity cannot generate sufficient wear loss to suppress micropitting.

Originality/value

The influence sequence of two factors on micropitting was investigated and the reason for the distribution was analyzed.

中文翻译：

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表面粗糙度和粘度对微孔蚀的影响

目的

本研究旨在研究表面粗糙度和粘度对微点蚀的影响及其影响顺序。

设计/方法/方法

样品由渗碳和淬火的18CrNiMo7-6制成，并通过研磨和喷丸处理获得不同的表面粗糙度。测试是在滚动润滑式摩擦计上进行的，在边界润滑条件下，使用了不同粘度的润滑剂和很重的负荷。激光共聚焦显微镜用于测量外观，表面粗糙度，接触区域的轮廓和微点蚀损伤百分比。设计了阶乘实验，并进行了范围分析，以找出影响表面粗糙度和粘度的顺序。

发现

结果表明，表面粗糙度具有更显着的影响，因为粘度的变化不能产生足够的磨损损失来抑制微点蚀。

创意/价值

研究了两个因素对微蚀的影响顺序，并分析了分布的原因。