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首页> 外文会议>Society of Tribologists and Lubrication Engineers annual meeting amp; exhibition 2009 >CHARACTERISATION OF MICROSTRUCTURAL TRANSFORMATIONS IN MICROPITTED GEARS
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CHARACTERISATION OF MICROSTRUCTURAL TRANSFORMATIONS IN MICROPITTED GEARS

机译：齿轮微结构的表征

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The predominant phase in the dark etching regions has been identified by Electron Backscatter Diffraction as cementite. The amount of the carbon required to form this phase must come from the lubricant which may explain why micropitting is observed in many different steels including those which have not been carburised.rnThe current observations suggest that the mechanism of micropitting in gears is linked to the phase transformations induced by the contact fatigue process. As a result of severe plastic deformation of asperities, microcracks initiate at the surface in the region of enhanced carbon content.rnThese cracks then propagate along the boundary of the transformed region until they reach the surface again to form a micropit.
机译：在暗蚀刻区域中的主要相已通过电子背散射衍射鉴定为渗碳体。形成该相所需的碳量必须来自润滑剂，这可以解释为什么在许多不同的钢中（包括未渗碳的钢）都观察到微点蚀。rn当前的观察结果表明，齿轮中微点蚀的机理与该相有关。接触疲劳过程引起的转变。由于粗糙的严重塑性变形，微裂纹在碳含量增加的区域内表面处引发。然后，这些裂纹沿转换区域的边界传播，直到再次到达表面形成微坑为止。

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