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| Effect of nitrogen on the microstructure evolution in 20MnSi steel bearing with niobium |
| CAO Lei，YANG Zhong-min，CHEN Ying，WANG Hui-min，ZHAO Xiao-li |
| Department of Engineering Steels， Central Iron and Steel Research Institute， Beijing 100081， China |
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Abstract Investigations were carried out to evaluate the influence of nitrogen on the microstructure evolution in 20MnSi steel bearing with niobium. Two steels with different nitrogen contents solution treated at 1 200 ℃ were rapidly cooled to their[Ac3]and then cooled to the room temperature at the cooling rates of 200 and 100 ℃/h， respectively. Observations were conducted by optical microscopy(OM)，scanning electron microscopy(SEM）and transmission electron microscopy(TEM). The results demonstrate that the acicular ferrite nucleated and grew at the carbon-poor areas which were caused by the Nb(C， N) precipitation at the high density dislocation region within the prior austenite grain. The enhancement of nitrogen was beneficial to inhibit the formation of the acicular ferrite and promote the formation of equaxied ferrite. Also， the fraction of degenerated pearlite was decreased and the pearlite nodules were in a fine and uniform distribution.
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Received: 19 March 2015
Published: 29 October 2015
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2015, Vol. 50 
