对研制的两种硬面药芯焊丝HDY704、HDY502焊态和焊后热处理堆焊层金属的显微组织及耐磨性能进行了研究,探讨了堆焊层金属的磨损机理.结果表明:合金钢硬面药芯焊丝HDY704和不锈钢硬面药芯焊丝HDY502堆焊层金属的显微组织均为马氏体加少量残余奥氏体;焊后热处理均能提高其耐磨性能;热处理后HDY502堆焊层金属有弥散碳化物析出使硬度增加近10 HRC,而HDY704堆焊层金属的硬度不变;堆焊层金属的磨损机理为沙粒在压力作用下被压入基体中沿运动方向的切削破坏.
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