Solid powder siliconizing of silicon steel shin strip produced by asymmetric rolling
LIU Gang1，MO Cheng-gang1，LI Chao1，SHA Yu-hui2
1. Research Academy，Northeastern University，Shenyang 110819，Liaoning，China 2. Key Laboratory of Electromagnetic Processing of Materials of Ministry of Education，Northeastern University，Shenyang 110819， Liaoning，China
Abstract：In order to investigate the possibility to reduce the temperature and the halide content in a siliconizing process through the formation of nanostructure on the surface layer of steel strip， 3.0% and 0.5% silicon steel samples were selected to be treated by means of asymmetric rolling and solid powder siliconizing treatment， the microstructural evolution， the phase transformation and the compositions were examined using different techniques. Experimental results show that， nanocrystallines form on the top surface layer of both kinds of samples after the asymmetric rolling with a large reduction， the grain sizes are 50 nm and 700-120 nm， respectively. After the siliconizing at 500 ℃ in the mixture of Si powder and 5% halide， compound layers can be obtained for both of the asymetric rolled samples， a higher Si content in original sample is helpful for the reduction of the initial siliconizing temperature. The thickness of the compound layer is observed to increase significantly with the increment of the siliconizing temperature and the duration at higher temperature， however remains unchanged with the increment of halide content. With the increment of siliconizing temperature and halide content， phase transformations in the compound layer are detected as follows： Fe3Si→FeSi＋Fe3Si→FeSi.
2016, Vol. 51 
