钴基高温合金渗硼层组织及性能的研究  

Study on Microstructure and Properties of Boriding Layer of Cobalt-based Superalloy

作　　者：匡小围 陈灿坤 唐冬梅 曹志华 王金林 Kuang Xiaowei;Chen Cankun;Tang Dongmei;Cao Zhihua;Wang Jinlin(Seed Technologies Corp.,LTD,Zhuzhou Hunan 412000,China)

机构地区：[1]西迪技术股份有限公司,湖南株洲412000

出　　处：《硬质合金》2020年第6期431-437,共7页Cemented Carbides

基　　金：湖南省战略性新兴产业科技攻关项目《高性能液压柱塞泵/马达及相关传动系统集成产品的研发与制造》(2017GK4017)。

摘　　要：高温合金因其具有良好的耐高温、耐腐蚀性、抗氧化性及冲击韧性等优点而被广泛应用。日益苛刻的工作条件对高温合金的表面硬度及耐磨性提出了更高的要求。本文通过对钴基高温合金进行固体渗硼处理,并采用扫描电子显微镜、能谱仪及X射线衍射仪等先进检测手段,研究了渗层组织结构及其硬度、耐磨性、耐腐蚀性能。结果表明,渗硼后的钴基高温合金表面形成了40~90μm厚的超硬化合物层,该化合物层分为两层,其组织结构均匀平缓且与基体结合紧密,主要包含了CoB,CrB,W_(2)B等硬质硼化物,渗层厚度随时间和温度的增加而增加。渗层表面硬度最高可达2150 HV0.1,其耐磨性较基体相比提高了约11.2倍,且合金的耐腐蚀性能在渗硼后基本未发生变化。Superalloys have been widely used for their high temperature resistance,corrosion resistance,oxidation resistance and impact toughness.The increasingly harsh working conditions put forward higher requirements for the surface hardness and wear resistance of the superalloy.In this paper,by means of scanning electron microscope,energy spectrometer and X-ray diffractometer and other advanced detection methods,the microstructure,hardness,wear resistance and corrosion resistance of the permeable layer of cobalt-based alloy after pack boriding treatment were studied.The results showed that the superhard compound layer of 40~90μm thick was formed on the surface of the cobalt-based superalloy after boriding under the test process parameters,the compound layer was composed of two layers of homogeneous and smooth organizational structure closely bound to the matrix,the main compounds of the layer are hard boride phases such as CoB,CrB and W_(2)B.The thickness of the permeation layer increased with time and temperature.The surface hardness of the layer can reach up to 2150 HV0.1,its wear resistance is increased by about 11.2 times compared with the matrix,and the corrosion resistance of the alloy is basically unchanged after boriding.

关 键 词：高温合金 渗硼 厚度 硬度 

分 类 号：TG174.445[金属学及工艺—金属表面处理]