Q235钢表面纳米化处理对离子注入的影响

Effect of Surface Nanocrystalline on Ion Implantation in Q235 Steel

通过高能喷丸处理,在Q235低碳钢的表面得到了一层约20μm厚的纳米晶组织,然后使用金属蒸汽弧离子注入机(MEVVA)对表面纳米化处理前后的试样进行了钛离子注入。研究结果表明,Ti注入Q235钢后,浓度基本上服从Guass分布;经过表面纳米化处理的样品,注入元素浓度与未经处理的相比有了很大的提高,而离子注入的深度则变化不大。浓度升高的主要原因可能是经过表面纳米化处理的试样表面层含有更多的缺陷,注入原子与这些缺陷的交互作用导致了其固溶度的超额增加。

A nanocrystalline surface layer of about 20μm thickness was fabricated on Q235 low carbon steel plates by means of high energy peening treatment （HEPT）. Then Ti ion was implanted into the HEP treated samples and untreated coarse-grained samples using Metal Vapor Vacuum Arc （MEVVA） source implantors. Ti distribution submits Guassian function after it was implanted into Q235 low carbon steel. Compared to untreated coarse-grained samples, implantation concentration of Ti in the samples after the processing increases dramatically, while the implantation depth changes very little. The reason may be that there is higher density of defects （supersaturated vacancies, dislocations, nonequilibrium grain boundaries etc. ） in the nanocrystallined surface layer via HEPT compared to the conventional coarse-grained materials, the interaction between the defects and the implanted solute atoms leads to increment of solid solubility of the solute atoms.