摘要
用光学显微镜、扫描电镜、X射线衍射仪和显微硬度计对钴基合金等离子喷焊的组织结构和显微硬度以及时效过程中的物相和显微硬度变化进行了研究。结果表明:合金层主要是由γ Co和(Cr,Fe)7C3构成,可以分为3个不同的层区,表现出亚共晶的组织形态。时效过程中物相发生了变化,(Cr,Fe)7C3转变为Cr23C6,时效后细枝晶亚层显微硬度平均提高约29%。时效过程中物相的析出是细枝晶亚层显微硬度发生变化的原因。
The microstructure and microhardness of cobalt-based alloy plasma spray welding were investigated using optical metalography (OP), scanning electron microscopy (SEM), X-ray diffraction (XRD) and microhardness test. The changing of phase and microhardness of the cobalt-based alloy layer during aging was also studied. The results showed that cobalt-based alloy layer is composed of γ-Co and (Cr,Fe)_7C_3, the microstructure could be divided into three different layers, and the hypoeutectic structure is shown. On the other hand, the phase of the alloy layer changed with aging, and (Cr,Fe)_7C_3 changed into Cr_(23)C_6. The microhardness of the fine dendrite zone increased about 29% after aging. And the precipitation of new phase during aging was the reasons for the changing of microhardness of the fine dendrite zone.
出处
《机械工程材料》
CAS
CSCD
北大核心
2004年第5期4-6,25,共4页
Materials For Mechanical Engineering
基金
安徽省科技厅中韩合作资助项目(00250807)
中美国际合作资助项目(01088013)CSiCrFeNiWMoCo
关键词
等离子喷焊
钴基合金
时效
显微组织
性能
plasma spray welding
cobalt-based alloy
aging
microstructure
property
