采用超音速微粒轰击技术在Cr-Si合金钢的表面制备了纳米结构层.最表面层的晶粒尺寸约为16nm.利用X射线衍射(XRD)技术和透射电镜(TEM)分析技术对退火后表面纳米晶的结构变化进行分析.结果显示:当温度低于450℃进行退火时,表面纳米晶的尺寸变化不大.当退火温度达到450℃时,表面纳米晶失去稳定急剧长大到100nm左右.分析表明在低于450℃时,Cr-Si合金钢表面纳米晶具有良好的热稳定性,表面纳米晶的本征结构、退火时结构的动态回复以及渗碳体颗粒对晶界运动的阻碍是决定其具有一定的热稳定性的主要因素.
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