制备含Y过共晶Fe-Cr-C堆焊合金,采用不同的热处理工艺,得到了不同基体的过共晶Fe-Cr-C合金.采用光学显微镜对其组织进行了观察,采用X射线衍射仪对其相结构进行了分析,采用硬度计、摩擦磨损试验机对其硬度和耐磨性进行了测定,采用扫描电镜对磨损形貌进行观察.结果表明,4种合金组织都是主要由初生碳化物以及共晶组织构成.焊态时,基体为奥氏体+部分马氏体;950℃退火后,基体为铁素体;950℃淬火后,基体为马氏体+残留奥氏体;450℃回火后,基体为回火马氏体+残留奥氏体.合金的硬度和耐磨性变化随基体组织的变化而变化,950℃退火试样硬度最低、耐磨性最差,950℃淬火试样硬度最高、耐磨性最好,450℃回火试样抗开裂性能较好.过共晶Fe-Cr-C堆焊合金的磨损机制主要是微切削和微犁削.
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