宽带激光熔覆WCp/Ni基合金梯度复合涂层的组织和耐磨性  

Microstructure and Wear Resistance of Gradient Composite Coating of Cast WCp/Ni Based Alloy Cladded by Wide-Band Laser

作　　者：刘其斌[1] 陈佳[1] 王存山[2] 夏元良[2] 董闯[2] 

机构地区：[1]贵州工业大学材料中心,贵州贵阳550003 [2]大连理工大学三束材料改性国家重点实验室,辽宁大连116024

出　　处：《钢铁研究学报》2002年第3期56-59,共4页Journal of Iron and Steel Research

基　　金：教育部国家重点实验室访问学者基金 (2 0 0 0 -12 3 );贵州省教育厅自然科学基金 (2 0 0 0 -12 48)资助项目

摘　　要：为了消除激光熔覆过程中产生的裂纹 ,设计了一种梯度复合涂层并研究了其组织和耐磨性。结果表明 ,熔覆层与基材之间形成了良好的冶金结合。梯度复合涂层中有未完全溶化的铸造WCp和共晶组织γ- Ni+Ni3B,还有凝固结晶析出的白色不规则块状组织 M7C3、M6 C、WC以及深灰色不规则块状组织 W2 C。复合涂层中形成了少量的非晶、纳米晶及高密度位错。复合涂层耐磨性的最高值是基材的 3倍以上。In order to eliminate cracks produced in the process of laser cladding, a kind of gradient composite coating was designed. The microstructure and wear resistance of gradient composite coating of WCp/Ni based alloy cladded by wide band laser were studied. The results indicated that the excellent metallurgical bonding is formed between cladded layer and substrate. There are γ Ni dendrite structure, γ Ni+Ni 3B eutectic structure, precipitation phases such as M 7C 3, M 6C, WC as well as W 2C in the gradient composite coating, and there are also a small number of substructures such as amorphous and nanocrystal particles as well as high density dislocation in the composite coating. The highest value of wear resistance of the composite coating is over four times more than that of substrate.

关 键 词：宽带激光熔覆 WCp/Ni基合金 梯度复合涂层 组织 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG156.99[金属学及工艺—金属学]