纯铁表面喷丸处理对镍扩散性能的影响

Effect of high-energy shot peening on diffusion behavior of nickel in iron

采用高能喷丸(HESP)对纯铁棒样端面进行了表面自纳米化(SSNC)处理,通过金相显微镜、扫描电子显微镜及X射线衍射对表面变形层厚度、晶粒度及硬度等进行了表征;然后在Gleeble 1500型热模拟试验机上实现镍箔在纯铁表面的渗入,并利用扫描电子显微镜对扩散的效果进行了比较分析.结果表明,工业纯铁经喷丸处理,表面晶粒得到明显细化,表面硬度明显增加,显微硬度比心部基体组织高出近一倍;经过喷丸处理试样表面镍的扩散速率与未经喷丸处理试样相比,有了明显的提高,表面自纳米化技术提高了镍在工业纯铁表面的扩散效果.

High-energy shot peening(HESP) was used to make surface self nano-crystallization(SSNC) on pure iron.The thickness of the deformation layer,surface grain size and hardness were characterized by optical microscope(OM),scanning electron microscopy(SEM) and X-ray diffraction analysis(XRD),and then Ni film was penetrated into the surface of iron by the Gleeble 1500 thermal simulation test machine.The SEM was used to compare the diffusion effects.The results showed that the surface of industrial pure iron was refined obviously after the shot peening treatment,its hardness increased significantly and was one time higher than that of the matrix.Under the same conditions,the diffusion rate of Ni in the specimen after SSNC was higher than that without SSNC,so the SSNC technology can improve diffusion effect of Ni on the surface of industry pure iron.