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| Effect of Niobium on Surface Decarburization Sensitivity of 60Si2Mn Spring Steel |
| ZHAO Dong-yu1,2，YONG Qi-long2，YANG Geng-wei1,2,3，SUN Xin-jun2，LI Zhao-dong2，ZHANG Zheng-yan2 |
（1. School of Materials Science and Engineering， Kunming University of Science and Technology，Kunming 650093， Yunnan， China
2. Department of Structural Steels， Central Iron and Steel Research Institute， Beijing 100081， China
3. School of Materials and Metallurgy，Wuhan University of Science and Technology， Wuhan 430081， Hubei， China） |
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Abstract The decarburization layer of spring steels with different Nb contents were measured by metallographic microscopic method, the effect of niobium and its content on the surface decarburization sensitivity of 60Si2Mn spring steel was systematically investigated. The results show that niobium can effectively reduce the decarburization sensitivity of 60Si2Mn spring steel. However, the depth of the decarburization does not decrease with the niobium content further increases. The diffusion coefficients of carbon in austenite in different temperatures were calculated by means of Thermo-Calc DICTRA software in which the effects of niobium and other elements on diffusion of carbon in austenite were considered. And the variation of decarburizing depths of the experimental steels was calculated by the Fick’s second law. It agrees with the measured data and can be used to investigate the effects of other alloying elements on the decarburization more effectively.
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Received: 02 November 2013
Published: 07 May 2014
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2014, Vol. 49 
