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金属学报  2016, Vol. 52 Issue (3): 307-312    DOI: 10.11900/0412.1961.2015.00233
  论文 本期目录 | 过刊浏览 |
异步轧制硅钢表面纳米结构稳定性与渗硅行为*
刘刚1(),李超1,马野1,张瑞君1,刘勇凯1,沙玉辉2
1 东北大学研究院, 沈阳 110819
2 东北大学材料电磁过程研究教育部重点实验室, 沈阳 110819
HEAT STABILITY AND SILICONIZING BEHAVIOR OF SURFACE NANOSTRUCTURE OF SILICON STEEL INDUCED BY ASYMMETRIC ROLLING
Gang LIU1(),Chao LI1,Ye MA1,Ruijun ZHANG1,Yongkai LIU1,Yuhui SHA2
1 Research Academy, Northeastern University, Shenyang 110819, China
2 Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China
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摘要: 

对3%无取向硅钢进行异步轧制以实现表面纳米化, 分别在真空和渗硅条件下进行不同参数的热处理, 研究显微组织,物相和成分的演变. 结果表明: 经过速比为1.31, 轧制道次为20, 总压下量为91%的异步轧制后, 板材表面形成了尺寸为10~20 nm, 取向呈随机分布的纳米晶; 在真空下升温, 表面纳米晶的再结晶温度明显提高; 在渗硅剂(Si粉+1% (质量分数)卤化物)中升温, 表面纳米晶的再结晶温度因外部Si原子沿着缺陷的快速扩散而进一步提高, 使得纳米晶界面能够在更高的温度下(750 ℃)发挥扩散通道作用, 促进Si原子的扩散, 并在显著地降低保温时间和(作为催化剂的)卤化物含量的同时获得致密的渗Si层.

关键词 硅钢异步轧制表面纳米化热稳定性渗硅    
Abstract

Heat stability of nanostructure can be related to alloy element, in order to investigate the effect of external element diffusion, asymmetrical rolling was adopted to roll 3% non-oriented silicon steel to realize the surface nanocrystallization, heat-treatment with different parameters was carried out for the rolled sheet in vacuum and Si+1% (mass fraction) halide powder respectively, and different techniques were used to examine the microstructural evolution, phase transformation and Si distribution along the depth. Experimental results show that nanocrystallines about 10~20 nm in size with random orientations form in the top-surface layer after the asymmetrical rolling with the mismatch speed ratio 1.31 and rolling passes 20 for 91% reduction. In the heating process in vacuum, the recrystallization temperature of the nanocrystallines in the top surface layer of the rolled sheet was found to increase obviously comparing with that obtained after keeping at this temperature for a long duration. In the heating process in Si+1% halide powder, a further enhancement of the recrystallization temperature was observed for the nanocrystallines in the top surface layer of the rolled sheet due to the fastly diffusion of Si atoms along the defaults, then the larger volume fraction of grain boundaries can act as fast diffusion channel at higher temperature (750 ℃), that can accelerate the diffusion of Si atoms, therefore dense compound layer can be obtained within shorter duration and with lower fraction of halide (acts as activator).

Key wordssilicon steel    asymmetric rolling    surface nanocrystallization    heat stability    siliconizing
收稿日期: 2015-04-21      出版日期: 2016-03-17
基金资助:*国家高技术研究发展计划资助项目2012AA03A505

引用本文:

刘刚, 李超, 马野, 张瑞君, 刘勇凯, 沙玉辉. 异步轧制硅钢表面纳米结构稳定性与渗硅行为*[J]. 金属学报, 2016, 52(3): 307-312.
Gang LIU, Chao LI, Ye MA, Ruijun ZHANG, Yongkai LIU, Yuhui SHA. HEAT STABILITY AND SILICONIZING BEHAVIOR OF SURFACE NANOSTRUCTURE OF SILICON STEEL INDUCED BY ASYMMETRIC ROLLING. Acta Metall Sin, 2016, 52(3): 307-312.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2015.00233      或      http://www.ams.org.cn/CN/Y2016/V52/I3/307

图1  异步轧制硅钢及经过Si+1%卤化物中升温至750 ℃时板材表面的TEM像和SAED谱
图2  异步轧制硅钢在真空中不同温度保温30 min后横截面的OM像
图3  异步轧制硅钢在真空中升温至不同温度后横截面的OM像
图4  异步轧制硅钢在Si+1%卤化物中升温至不同温度后横截面的OM像
图5  异步轧制硅钢在Si+1%卤化物中升温至不同温度后表面的XRD谱
图6  异步轧制硅钢在Si+1%卤化物中升温至750 ℃后横截面的SEM像
图7  异步轧制硅钢在渗硅剂中经过不同参数热处理后横截面的SEM像
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