摘要
运用激光熔覆技术在４５＃钢表面制备了ＷＣｐ增强Ｎｉ－Ｃｒ－Ｂ－Ｓｉ－Ｃ复合涂层。含量为３０ｖｏｌ－％ＷＣ典型涂层的ＸＲＤ，ＳＥＭ和ＴＥＭ分析表明，ＷＣｐ在熔覆的熔化阶段发生部分溶解和分解。激光熔体凝固时形成的微观组织由Ｎｉ＋Ｎｉ３Ｂ共晶基体上分布的杆（或薄片）状α－Ｗ２Ｃ，块状β－Ｗ２Ｃ和四方形η１碳化物Ｍ６Ｃ相组成。这类碳化物主要含Ｗ，并含大量Ｃｒ。销－环式干滑动磨损试验表明，当ＷＣｐ含量约为３０ｖｏｌ－％时。
WCp reinforced Ni Cr B Si C composite coatings were deposited on AISI1045 steel by laser. The microstructure of the typical coating containing 30vol % WC particulates was investigated using XRD, SEM and TEM. It was found that partial WC dissolved and decomposed in the laser melt pool during the melting stage of the cladding. The rapidly solidified microstructure of the laser melt is composed of metastable bar like α W 2C, blocky β W 2C and quadrilateral η 1 carbide M 6C precipitates distributed in Ni/Ni 3B lamellar eutectic. Dry sliding wear tests suggested that the composite coating containing about 30vol % WC particulates has the highest wear resistance.
出处
《中国激光》
EI
CAS
CSCD
北大核心
1999年第2期186-192,共7页
Chinese Journal of Lasers
基金
金属精密热加工国防科技重点实验室资助项目
关键词
激光熔覆
合金涂层
显微组织
磨损
laser cladding, WCp/Ni alloy composite coating, microstructure, wear
