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| Kinetics of massive transformation for an ultra-low carbon steel containing niobium |
| LU Heng-chang1，HU Chun-dong2，WANG Cun-yu1，PU En-xiang1，LIU Jian-hui1，DONG Han1,2 |
（1. Institute for Special Steels， Central Iron and Steel Research Institute， Beijing 100081， China
2. School of Materials Science and Engineering， Shanghai University， Shanghai 200072， China） |
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Abstract For investigating the transformation mechanism and kinetics of an ultra low-carbon high niobium steel（0.002C-0.52Nb）, the dilatometry was employed by continuous cooling process. The microstructure was observed by OM and SEM. A modified Johnson-Mehl-Avrami（JMA）kinetics model was used to calculated the migration velocities of the advancing interface.The results show that the transformation mechanism for various cooling rates is massive transformation. The massive ferrite is characterized by zigzag grain boundary and the product can across the initial austenite grain boundary. The calculated interphase velocity is approximately constant with a mean value of （0.65，1，1.7，6.2）×10－5 m/s for 3，5，10，30 ℃/s respectively，which is proportional to cooling rate，implying that the employed model is available to massive transformation of the investigated steel. The solute niobium seems to have some effects to decrease the interphase migration velocities compare to that reported in literatures.
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Received: 27 June 2017
Published: 26 February 2018
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2018, Vol. 53 
