55Mn钢表面激光熔覆原位析出颗粒增强Ni基复合涂层的组织与性能

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1、!!"#钢表面激光熔覆原位析出颗粒增强$%基复合涂层的组织与性能李!晶，钟敏霖，刘文今（清华大学机械系先进成形制造教育部重点实验室，北京!"###$%）摘要：在楔横轧模具钢&&’(表面采用同轴送粉)*+激光熔覆,)-./)01镍基合金复合粉末，在增碳、锆条件下可获得成形好、无裂纹、与基体冶金结合的熔覆层。熔覆层微观组织特征为!（-23，4/）基体上均匀分布的大量从液+态析出的富含./、,、56的复合碳化物颗粒相。熔覆层表层颗粒尺寸约为78$!9，颗粒数量约为:&##个199；+熔覆层中部析出颗粒数目约为%+"##个199，尺寸约为"8:!9；熔覆层底部析出

2、颗粒尺寸约为"8+!9，颗粒+数量约为";$##个199。中部区域个别析出颗粒相中间出现黑色圆点状组织。激光熔覆后模具钢表面形成:个不同的硬度分布区域，激光熔覆层硬度为%+7<=#>+，深度"#+#!9；热影响区硬度为7%#<=#>+，深度7$#!9；基体的硬度为+&#<=#>+。激光熔覆后的硬度分布兼顾了模具使用要求和后续加工。无润滑的环块磨损试验发现：激光熔覆处理后的试样摩擦系数降低:#?，耐磨性提高一倍。关键词：激光熔覆；析出相；耐磨性中图分类号：&’(!)*++,,文献标识码：-,,文章编号：./!01).!(（/..)）((1...21.!"%3

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