在珠光体球墨铸铁表面Fe－C－Si-B激光共晶合金化层上获得了占整个熔池面积的80％以上的白亮层.经透射电镜明场形貌和电子选区衍射证实白亮层为非晶组织激光非晶化时熔池底部晶态基体的外延生长是影响非晶化的最关键因素.外延生长的突然中断是实现非晶化的首要条件.外延生长的突然中断只有在共晶成分且成分均匀，组织细化以及足够的激光功率密度和扫描速度下才发生
Bright layers covering 80 % of the melt area have been achieved by laser glazing on Fe-C-Si-B eutectic matrix prealloyed by laser on nodular iron substrates, which are verifled to be metallic glasses by electron diffraction. It is demonstrated in the paper that epitaxial growth from the crystalline substrate at melt bottom is the most critical factor during laser glazing. The chief condition for glass forming is the abrupt stop of the epitaxial growth during solidification, which is dependent upon the eutectic composition, composition homogeneity, fine microstructure, laser glazing power density and scanning velocity.
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