齿轮钢高温渗碳后的疲劳性能

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Abstract The fatigue properties of microalloying gear steels with Nb and Ti (steel A1:w(Nb)0.077%; steel A2:w(Nb)0048%+w(Ti)0.038%) after carburized at 1000℃ were investigated by means of rotating bending fatigue tests. The results show that the precipitates in steel A2 microalloyed with Nb and Ti are smaller in size and higher in volume fraction than those in steel A1 microalloyed only with Nb resulting in the higher fatigue limit for steel A2 compared with steel A1. The SEM observation of fracture surface show that the fatigue crack initiates from the near surface matrix for both steels, and it propagates around grain boundaries in the carburized case, and thus superior fatigue properties are found for steel A2 with finer and more uniform prior austenite grains in carburized case layers.

Received: 04 September 2012 Published: 18 July 2013

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	Articles by authors
	YANG Yan-Hui
	YU Mao-Qiu
	CHEN Jing-Tiao
	DONG Han

Cite this article:

YANG Yan-Hui,YU Mao-Qiu,CHEN Jing-Tiao等. Fatigue Properties of Gear Steels After High Temperature Carburizing[J]. Iron and Steel, 2013, 48(7): 53-57.

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http://www.chinamet.cn/Jweb_gt/EN/ OR http://www.chinamet.cn/Jweb_gt/EN/Y2013/V48/I7/53

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