H13钢表面TiC／Co基激光修复层的显微组织与力学性能  

Microstructure and mechanical properties of TiC /Co composite coating by laser cladding on H13 steel surface

作　　者：范氏红娥[1,2] 张晓伟 王传琦[1] 刘洪喜[1] 蒋业华[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]胡志明市技术师范大学机械工程学院,越南胡志明市720035

出　　处：《焊接学报》2013年第11期27-31,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助顶目(51261013,51165015)

摘　　要：采用激光熔覆技术在H13热作模具钢表面分别制备了Co50合金涂层和TiC/Co基复合涂层.借助XRD,SEM与显微硬度计对比分析了涂层与基材的结合状态、涂层物相组成、截面组织形貌和显微硬度分布.结果表明,Co50合金涂层和TiC/Co基复合涂层均与H13钢基材呈良好冶金结合特征.Co50合金涂层主要由初生γ-Co枝晶及其间的共晶组织组成,而TiC/Co基复合涂层主要由TiC颗粒、枝晶及细小的共晶组织组成,其组成相除含有TiC,TiCo3和Cr2Ni3外,还有Cr-Ni-Fe-C等相.涂层截面显微硬度分布表明,TiC/Co基复合涂层截面平均显微硬度明显高于Co50合金涂层,分别为5 520 MPa和4 990 MPa,分别是H13钢基材的2.7和2.4倍.TiC /Co composite coating and Co50 alloy coating were prepared by laser cladding of on the AISI H13 hot work tool steel surface. The bonding characteristics,phase constitution,microstructure and micro-hardness distribution of the coatings were analyzed and tested by XRD,SEM and micro-hardness tester. The results indicate that Co50 alloy coating as well as TiC / Co composite coating show good metallurgical bonding with the H13 steel substrate surface. Co50 alloy coating was mainly composed of γ-Co dendrite and eutectic between γ-Co dendrites, while TiC / Co composite coating which contained TiC particles, dendrite and fine eutectic,was consisted of TiC,TiCo 3,Cr 2 Ni 3 as well as Cr-Ni-Fe-C,and so on. The average micro-hardness of cross-section of TiC / Co-based composite coating and Co50 alloy coating are 5 520 MPa and 4 990 MPa,about 2. 7 times and 2. 4 times higher than that of the H13 steel substrate.

关 键 词：激光熔覆 热作模具钢 钴基合金 复合涂层 

分 类 号：TN249[电子电信—物理电子学]