为探索不同渗碳层深度对重载齿轮钢疲劳性能的影响,利用旋转弯曲疲劳试验研究了18Cr2Ni2MoVNb重载齿轮钢未渗碳和渗碳试样的疲劳性能。结果表明：渗碳后渗碳层硬度升高,疲劳性能显著提高;随渗碳时间的延长,渗碳层深度增加,残余奥氏体含量增加,因此随渗碳层深度的增加,试验钢的疲劳性能呈先增加后降低的趋势;当渗碳层深度为1mm时,18Cr2Ni2MoVNb试验钢疲劳性能较好。
To explore the fatigue properties of heavy-duty gear steel with different case depth,fatigue properties of heavy-duty gear steel 18Cr2Ni2MoVNb were investigated by means of rotating bending fatigue tests without carburization and after carburization.Results show that carburization can evidently increase the fatigue properties due to the extremely high hardness of carburized case.With increase of carburization time,the carburized depth increases,but the fatigue properties first increase and then decrease and the fatigue limit peaks at a case depth of 1 mm.It is due to the contradictory effects of case depth and the increased retained austenite fraction,which may counteract the improvement of fatigue properties by the increase of case depth.
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