利用Nd:YAG脉冲激光在不锈钢表层合金化SiO2纳米颗粒,在熔池最表层14 μm深度范围内形成Si合金化区域,Si含量呈非均匀分布特征.表层为非晶相与奥氏体的双相组织,非晶相弥散分布并呈现特殊的环状形貌,中心为非晶,外侧为纳米尺度的超细柱晶及等轴晶.分析了非晶形成机制.
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