摘要
通过滚动接触疲劳试验方法,研究了两种渗碳齿轮钢的接触疲劳性能。结果发现,渗碳齿轮钢接触疲劳试样失效方式主要为渗碳层的点蚀和剥落。氧含量较低的Nb微合金化齿轮钢(含0.04%的Nb)中氧化物夹杂数量少、尺寸小,接触疲劳裂纹起裂较难;同时,Nb微合金化齿轮钢渗碳层晶粒尺寸小、硬度高,提高了疲劳裂纹萌生及扩展阻力,导致Nb微合金化后,齿轮钢的接触疲劳寿命大幅度提高。
Contact fatigue properties of two case hardening steels have been investigated by means of roiling contact fatigue tests with carburized specimens. Results show that most of the rolling contact fatigue specimens failed due to pitting and spalling in the carburized case. The steel microalloyed with 0.04% niobium has a lower oxygen content and fewer quantity and smaller size of oxide inclusions, which makes fatigue crack initiation more difficult. Moreover, it is also more difficult for fatigue crack propagation in the case of the niobium microalloying steel, owing to its finer grain size and higher hardness. As a result, the rolling contact fatigue life of the steel microalloyed with niobium is much higher than that of the steel without microalloying.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2009年第3期251-256,共6页
Chinese Journal of Materials Research
基金
国家八六三计划新材料领域2006AA03Z526资助项目~~
关键词
金属材料
齿轮钢
微合金化
接触疲劳
夹杂物
晶粒尺寸
metallic materials, case hardening steel, microalloying, rolling contact fatigue, nonmetallic inclusion, grain size
