本文研究了激光微熔处理和高频感应加热淬火对球墨铸铁表面组织、接触疲劳强度和接触疲劳破坏过程的影响。结果表明,激光处理和高频淬火均可提高球铁的接触疲劳强度,但其接触疲劳破坏过程和形式却不同,前者是由于硬化层与基体间裂纹扩展造成大块深层剥落,后者则是表层裂纹在油楔作用下造成小块浅层脱落。
The influence of laser surface melting and induction hardening on thesurface structure, contact fatigue life and failure behaviour of the nodular graphitecast iron has been investigated. The contact fatigue life may be improved by bothlaser treatment and induction hardening, but the failure process and type aredifferent from each other. The former is due to lump and deep spalling caused bycrack propagation between the hardened layer and the substrate, and the later is dueto nubbly and surface flaking caused by the oil wedged action into surface cracks.The improvement on the contact fatigue life of the nodular cast iron was alsosuggested.
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