Abstract Rock drill components operate under tough contact conditions during rock drilling. Reciprocal and unidirectional motion under high contact stresses are the common contact conditions between interconnected components. It will result in component damage and often the observed surface damage of rock drill tools is due to wear and fatigue cracks. Nevertheless, the effects of the properties and structure of the mating materials on tribological performance, is not fully understood. The present study is dedicated to simulation and investigation of the wear mechanisms observed in reciprocal and unidirectional sliding of high strength steels for rock drill components. A high strength martensitic steel, 22NiCrMo12–F, commonly used in rock drills was tested in self-mating contact. Wear mechanisms were investigated by means of electron microscopy and wear damage was quantified by a 3D optical interferometer. Total damage, as a result of adhesive wear, severe plastic deformation and nucleation and propagation of fatigue cracks, was discussed in relation to test conditions and material properties. It was observed that the coefficient of friction decreased with increasing normal load. Moreover, the results showed that the type of motion had a significant influence on the worn volume and crack nucleation of the specimens in sliding contact. In addition, the reciprocal motion resulted in higher wear than unidirectional motion under the same test conditions.

中文翻译：

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干接触高强度钢往复和单向滑动的滑动磨损和疲劳裂纹损伤机制

摘要 凿岩机部件在凿岩过程中在恶劣的接触条件下运行。在高接触应力下的往复和单向运动是互连组件之间的常见接触条件。它将导致部件损坏，并且通常观察到的凿岩工具的表面损坏是由于磨损和疲劳裂纹。然而，配合材料的特性和结构对摩擦学性能的影响尚不完全清楚。本研究致力于模拟和研究在用于凿岩机部件的高强度钢的往复和单向滑动中观察到的磨损机制。一种常用于凿岩机的高强度马氏体钢 22NiCrMo12-F 在自配合接触中进行了测试。通过电子显微镜研究磨损机制，并通过 3D 光学干涉仪量化磨损损伤。结合试验条件和材料特性讨论了由于粘着磨损、严重塑性变形和疲劳裂纹的成核和传播导致的总损伤。观察到摩擦系数随着法向载荷的增加而降低。此外，结果表明，运动类型对滑动接触试样的磨损量和裂纹形核有显着影响。此外，在相同的测试条件下，往复运动比单向运动导致更高的磨损。严重的塑性变形和疲劳裂纹的形核和扩展，就试验条件和材料特性进行了讨论。观察到摩擦系数随着法向载荷的增加而降低。此外，结果表明，运动类型对滑动接触试样的磨损量和裂纹形核有显着影响。此外，在相同的测试条件下，往复运动比单向运动导致更高的磨损。严重的塑性变形和疲劳裂纹的形核和扩展，就试验条件和材料特性进行了讨论。观察到摩擦系数随着法向载荷的增加而降低。此外，结果表明，运动类型对滑动接触试样的磨损量和裂纹形核有显着影响。此外，在相同的测试条件下，往复运动比单向运动导致更高的磨损。