摘要
采用光学显微镜、X射线衍射、扫描电镜以及磨粒磨损试验研究了Cr3C2对等离子转移弧（PTA）堆焊钴基合金层组织和耐磨性的影响。结果表明，PTA堆焊钴基合金层主要由初晶仅（Co）固溶体和（α（C0）＋M7C3）共晶构成，具有亚共晶的组织特征，M7C3呈网状。10％～20％Cr3C2的加入使堆焊层的组织由亚共晶转变为过共晶，条状或块状M7C3未熔的大块状Cr3C2以及析出的球状Cr3C2分布在仪（Co）固溶体中，细化了钴基合金堆焊层的组织，提高了耐磨性。PTA堆焊钴基合金层的磨损机制主要为脆性剥落和犁削，而10％～20％Cr3C2加入后，其磨损机制则以轻微犁削为主。
Effects of Cr3 C2 addition on microstructure and wear resistance of cobalt-base alloy coating deposited by a plasma transferred arc （PTA） surfacing technology were investigated by using OM, XRD, SEM and abrasive wear tests. The results show that the cobalt-base alloy coating consists primarily of primary α （ Co ） solid solution and eutectic （α（Co） ＋ M7C3） which is characterized by a hypoeutectic structure, with M7C3 appearing in the form of network. The addition of 10% to 20 % Cr3C2 leads change of the cobalt-base alloy coating from hypoeutectic structure to hypereuteetic structure where there are bar or block M7C3, unmelted massive Cr3C2 and precipitated spherical Cr3C2, the microstructure of the cobalt-base alloy coating being refined, and its wear resistance being improved. Wear of the cobalt-base alloy coating was dominated by brittle spalling and ploughing, whereas its wear was dominated by slight ploughing after adding 10% to 20% Cr3C2.
出处
《热处理》
CAS
2015年第5期23-28,共6页
Heat Treatment
基金
安徽省自然科学基金资助项目(1508085ME95)
