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| Rolling contact fatigue of microalloying case carburized gear steels |
| MA Li; WANG Maoqiu; SHI Jie; HUI Weijun; DONG Han |
| National Engineering Research Center of Advanced Steel Technology; Central Iron and Steel Research Institute; Beijing 100081 |
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Cite this article:
MA Li WANG Maoqiu SHI Jie HUI Weijun DONG Han. Rolling contact fatigue of microalloying case carburized gear steels. Chin J Mater Res, 2009, 23(3): 251-256.
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Abstract Contact fatigue properties of two case hardening steels have been investigated by means of rolling 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.
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Received: 05 November 2008
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| Fund: Supported by National High Technology Research and Development Program of China No.2006AA03Z526. |
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