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本文用AMRAY—1000B型扫描电镜对灰铸铁激光处理后的显微组织及耐磨特性进行了研究。激光硬化区可分为二层。第一层由奥氏体枝晶组成,二次晶轴平均间距为1.5μm,在枝晶间存在着微小渗碳体;第二层由部分熔化的片状石墨、针状马氏体和大量的残余奥氏体组成,残余奥氏体经48小时冷处理转变成马氏体,并发现在第二层中有大量的“珠光体灵魂”,其上贯穿马氏体针。灰铸铁激光处理后的耐磨性能提高3倍,磨损表面光滑而无裂纹。
In this paper, AMRAY-1000B scanning electron microscope was used to study the microstructure and wear resistance of gray cast iron after laser treatment. Laser hardening zone can be divided into two layers. The first layer consists of austenite dendrite, the average secondary crystal axis spacing of 1.5μm, there is a small cementite between the dendrites; the second layer consists of partially melted flake graphite, acicular martensite and a large number Of retained austenite, retained austenite after 48 hours of cold treatment into martensite, and found in the second layer of a large number of “pearlite soul”, which runs through the martensitic needle. Gray cast iron laser treatment wear resistance increased by 3 times, wear a smooth surface without cracks.