铸铝激光熔融处理后的组织与性能

Microstructure and property of cast aluminium alloy after laser remelted treatment

应用光学和电子显微镜及显微硬度计研究了铸造ＡｌＳｉ合金经激光表面熔融处理后的组织和性能。指出，组织分熔化区、过度区和基体三层。在熔化区中树枝状先共晶α相的平均宽度由原始组织的２０～４０μｍ细化到２～３μｍ，同时共晶组织也被大大细化。

By means of the optical microscope,scanning electron microscope and microhardness meter,the paper deals with the microstructure and property of a cost aluminum alloy after laser remelted treatment.The microstructure can be divided into remelted zone,transition layer and substrate.In the remelted zone,the width of dendritical pro eutectic α phase has been fined to 2～3μm from 20～40μm original state.Meanwhile the eutectic microstructure has also been broken up extremely.These changes make the microhardness of the treated surface be increased to 109～115μm from 67.4.