Rolling, sliding part and process for producing same

Abstract

A rolling, sliding part is made from a bearing steel, and the rolling, sliding surface thereof has a surface layer portion which is 56 to 64 in Rockwell C hardness, up to 12 vol. % in retained austenite content and 4 to 6 degrees in the X-ray half value width of martensite. Even if made from a common bearing steel, the rolling, sliding part is reduced in the likelihood of developing a WEA or like fatigue structure, consequently exhibiting a prolonged rolling, sliding life for use under severe conditions involving a high temperature, high speed, high load or high vibration.

Description

technical field [0001] The present invention relates to rolling and sliding components and methods for their manufacture. More specifically, the present invention relates to power transmission components such as an alternator for a vehicle of an engine auxiliary machine, a compressor for an automobile air conditioner, a water pump component, and a disc and a roller of a toroidal continuously variable transmission under high temperature, high speed, and high temperature. Rolling and sliding parts used under severe working conditions such as load and high vibration, and their manufacturing methods. Background technique [0002] The rolling and sliding components mentioned in this specification and claims refer to components that perform pure rolling contact, pure sliding contact, and mixed rolling contact and sliding contact. [0003] For example, rolling bearing components such as rings and rolling elements of rolling bearings are made of bearing steel such as high-carbon ch...

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Problems solved by technology

[0006] However, for rolling and sliding parts made of low-cost ordinary bearing steel such as high-carbon chromium bearing steel or surface carburized hardened steel, how to suppress the generation of white layer has not yet been researched and developed.

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