激光重熔和时效处理的Co基合金堆焊层组织和性能  

Microstructure and properties of Co-base alloy hardfacing layer by laser remelting and aging treatment

作　　者：洪永昌[1,2] 王明辉[1,2] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]安徽省高校金属材料与加工重点实验室,安徽马鞍山243002

出　　处：《材料热处理学报》2011年第3期139-143,共5页Transactions of Materials and Heat Treatment

基　　金：安徽省教育厅自然科学研究项目(2005KJ036)

摘　　要：利用金相显微镜、扫描电镜、透射电镜、X射线衍射物相分析和显微硬度、耐磨性测定等试验手段,对激光重熔及经不同时效工艺处理后的Co基合金堆焊层显微组织、相结构、显微硬度及高温耐磨性能进行了分析研究。结果表明,经激光重熔后,Co基合金堆焊层的组织得到明显细化,硬度和耐磨性都得到提高;重熔堆焊层的组织主要由γ-Co和Cr7C3、Cr23 C6等强化相组成。经时效处理后的重熔堆焊层的硬度不但明显得到提高而且耐磨性均优于原始堆焊层。相比较,经900℃×6 h时效处理后的重熔堆焊层耐磨性最好。Microstructure,phases,microhardness and high temperature wear resistance of Co-base alloy hardfacing layer on a low carbon steel after laser remelting and aging treatment were studied by means of optical microscopy,scanning electron microscopy,transmission electron microscopy,X-ray diffraction,microhardness and wear resistance tests.The results show that microstructure of Co-based alloy hardfacing layer is significantly refined and its hardness,wear resistance is improved after laser remelting.The microstructure of remelted hardfacing layer consists of γ-Co matrix and Cr7 C3,Cr23 C6 strengthening phases.After aging treatment,microhardness and wear resistance of the remelted hardfacing layer increase compared with that of the un-treated hardfacing layer.The best wear resistance of the remelted hardfacing layer aged at 900 ℃ for 6 h is observed.

关 键 词：时效处理 激光重熔 CO基合金 组织 性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]