CAJ | 학술논문

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 Cr3 C2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α（Co）固溶体和（α（Co）＋M7 C3）共晶构成，具有亚共晶的组织特征，M7 C3呈网状。10％～20％ Cr3 C2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 M7 C3、未熔的大块状 Cr3 C2以及析出的球状 Cr3 C2分布在α（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％Cr3 C2加入后，其磨损机制则以轻微犁削为主。
채용광학현미경、X 사선연사、소묘전경이급마립마손시험연구료 Cr3 C2대등리자전이호（PTA）퇴한고기합금층조직화내마성적영향。결과표명，PTA 퇴한고기합금층주요유초정α（Co）고용체화（α（Co）＋M7 C3）공정구성，구유아공정적조직특정，M7 C3정망상。10％～20％ Cr3 C2적가입사퇴한층적조직유아공정전변위과공정，조상혹괴상 M7 C3、미용적대괴상 Cr3 C2이급석출적구상 Cr3 C2분포재α（Co）고용체중，세화료고기합금퇴한층적조직，제고료내마성。PTA 퇴한고기합금층적마손궤제주요위취성박락화리삭，이10％～20％Cr3 C2가입후，기마손궤제칙이경미리삭위주。
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,SEMand abrasive wear tests.The results show that the cobalt-base alloy coating consists primarily of primary α(Co)solid solution and eutectic (α(Co)+M7 C3 )which is characterized by a hypoeutectic structure,with M7 C3 appearing in the form of network.The addition of 10% to 20 % Cr3 C2 leads change of the cobalt-base alloy coating from hypoeutectic structure to hypereutectic structure where there are bar or block M7 C3 ,unmelted massive Cr3 C2 and precipitated spherical Cr3 C2 ,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% Cr3 C2 .