摘要
采用扫描电镜(SEM)、能谱分析仪(EDS)、X射线衍射仪(XRD)、显微硬度仪及滑动磨损试验,研究了1%纳米CeO_2(质量分数)对低碳钢表面激光熔覆Fe/Cr_3C_2复合涂层的组织结构和耐磨性能的影响。结果表明,Fe+Cr_3C_2+1%CeO_2复合涂层的主要组成相是α-Fe、γ-Fe、Cr_3C_2、Cr_(23)C_6及Cr_7C_3等化合物相;加入1%纳米CeO_2后,复合涂层组织明显细化,未熔Cr_3C_2数量显著减少,初生碳化物由粗大杆状向块状转变,数量增加,分布均匀,有效抑制和消除了裂纹的形成;复合涂层硬度和耐磨性能显著提高,Fe+30%Cr_3C_2+1%CeO_2涂层截面显微硬度提高105HV,增幅达到15.4%,且涂层沿深度方向硬度分布均匀性得到明显改善。
The effects of 1%nano-CeO_（2 ）doping to the organizational structure and wear resistance of Fe/Cr_3C_（2 ）composite coatings formed by using laser cladding on low-carbon steel surface has been researched in this paper with the aid of SEM,EDS,XRD,micro-hardness tester and sliding wearing test.Experimental results demonstrated that compound phases such asα-Fe,γ-Fe,Cr_3C_2,Cr_（23）C_6,Cr_7C_3,etc.are the main constituent phases of Fe＋Cr_3C_2＋1%CeO_2composite coatings.Composite coatings’microstructures were refined obviously after adding 1%nano-CeO_2,and the quantities of non-cladding Cr_3C_2reduced significantly,as well as the primary carbides transformed from coarse rod to block with risen quantity and uniform distribution,which effectively restrained and eliminated crack formation.The hardnesses and wear resistances of the Fe＋Cr_3C_2＋1%CeO_2composite coatings were improved significantly,and in particular,the cross-sectional micro-hardness of Fe＋30%Cr_3C_2＋1%CeO_2coating was 105HV higher than that of Fe＋30%Cr_3C_（2 ）coating（increased by 15.4%）.Meanwhile,the hardness distribution homogeneities of the doped coatings along depth direction gets improved apparently.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2017年第22期65-69,84,共6页
Materials Reports
基金
江苏省高校"青蓝工程"资助项目(2016)
江苏省高校青年教师企业实践计划项目(2016QYSJ037)
江苏省大学生创新创业训练计划项目(201611052002Y)
关键词
纳米CEO2
激光熔覆
FE基合金
CR3C2
复合涂层
组织
耐磨性
nano-CeO2,laser cladding,F e -b a s e d al loy c oat ing,Cr C 2,c om p o s i te c o a t in g,m ic r o s t r u c t u r e ,w e a r re s is ta n c e
