摘要
试验研究了铁基合金粉末等离子熔覆层经400～850℃高温处理后的组织变化。用扫描电子显微镜（SEM）观察熔覆层的微观组织和测定微区成分,用X射线衍射仪（XRD）分析熔覆层的物相。结果表明,合金熔覆层经750℃处理后仍能保持原硬度,高于750℃,硬度降低。熔覆层的基体组织是γ（Fe、Cr、Ni）固溶体和（Cr、Fe）7C3化合物。当加热到850℃时,基体析出颗粒状的化合物,且组织中碳化物的类型由（Cr、Fe）7C3转变为（Cr、Fe）23C6。
The influence of high temperature treatment on microstructure and hardness of iron alloy coating by plasma arc was analysed. The morphology as well as the micro-area composition of the coating were investigated by scanning electron microscope with the energy spectrometer. The phase constitution of the coating was detected by X-ray diffraction. The results show that the hardness of the coating reduces when the treated temperature is higher than 750 ℃. The coating is mainly consist of the solid solution g and the compound （Cr, Fe）7 C3. The compound particle is precipitated at 850C, and then the type of the carbides can transformes from （Cr, Fe）7C3 to （Cr, Fe）23C6.
出处
《金属热处理》
CAS
CSCD
北大核心
2008年第12期32-35,共4页
Heat Treatment of Metals
关键词
铁基合金
熔覆层
耐热性
显微组织
iron alloy
coating
heat resistance
microstructure
