表面喷丸硅钢的低温渗硅与参数的影响

为了用表面纳米化简化硅钢渗硅工艺及确定渗硅参数的影响,对硅钢进行了喷丸和固体粉末渗硅,用透射电镜、扫描电镜和X射线衍射等测试组织、物相和成分.结果表明:硅钢经过喷丸后,表面形成了具有随机取向的纳米晶,平均晶粒尺寸约为10 nm.在硅粉+卤化物中,喷丸样品于550℃即可实现固体渗硅.提高渗硅温度和在较高的温度下延长保温时间均能显著地增加渗硅层厚度,而卤化物含量的影响不大.经过固体渗硅后,渗硅层由Fe Si和Fe3Si两相组成,其中较高的温度和卤化物含量易得Fe Si相,而较低的温度和卤化物含量易得Fe3Si相.

Low-Temperature Siliconizing of Silicon Steel Subjected to Shot Peening and Effect of Siliconizing Parameter

A silicon steel was treated by using shot peening (SP) and followed by solid powder siliconizing treatment to investigate the possibility of simplify siliconizing operation by means of surface nanocrystallization and effect of siliconizing parameter. The microstructural evolution was examined by using transmission electron microscopy， scanning electron microscopy and X-ray diffraction， respectively. Experimental results showed that nanocrystallines (of about 10 nm in size) with random orientations form in the top surface layer of SP sample. After the siliconizing treatment in Si powder+halide at 550℃， a compound layer forms on the SP sample， and its thickness increases with the increasing of the siliconizing temperature and the duration at higher temperature， however keeps unchanged with the increment of halide content. The compound layer consists of FeSi and Fe3Si phases. The higher temperature and halide content / lower temperature and halide content are helpful for the formation of FeSi/Fe3Si phases， respectively.