Cr_(3)C_(2)+Ti复合改性激光熔覆Fe-0.3C-15Cr-1Ni合金的组织与性能  

Microstructure and Properties of Cr_(3)C_(2)+Ti Composite Modified Laser Clad Fe-0.3C-15Cr-1Ni Alloy

作　　者：胡德荣 郭铁明[1] 张瑞华 南雪丽[1] 董康 尹燕[1] 易湘斌 HU Derong;GUO Tieming;ZHANG Ruihua;NAN Xueli;DONG Kang;YIN Yan;YI Xiangbin(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;Hardware Knife Cut Industrial Technology Research Institute Yangjiang,Yangjiang 529533,China;Gansu Precision Machining Technology and Equipment Engineering Research Center,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [2]阳江市五金刀剪产业技术研究院,阳江529533 [3]甘肃省精密加工技术及装备工程研究中心,兰州730050

出　　处：《西安工业大学学报》2024年第4期413-423,共11页Journal of Xi’an Technological University

基　　金：国家自然科学基金项目(52161007);甘肃省交通厅科技项目(202102);甘肃省自然科学基金项目(20JR10RA170)。

摘　　要：为了改善Fe-0.3C-15Cr-1Ni合金涂层的硬度和耐蚀性能。采用激光熔覆技术在3Cr13不锈钢基体表面熔覆添加不同含量(Cr_(3)C_(2)+Ti)(0,0.5%,1%,2%)原位合成含有TiC的不锈钢基高硬度耐蚀涂层,利用金相显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)、显微硬度仪、电化学工作站等设备研究不同含量(Cr_(3)C_(2)+Ti)对熔覆层的微观结构、相组成、硬度分布及耐蚀性能的影响。结果表明:熔覆层与3Cr13不锈钢基体间界面冶金结合良好。加入(Cr_(3)C_(2)+Ti)后熔覆层的树枝晶和柱状晶转变为胞状晶和等轴晶;碳化物由鱼骨状和块状转变为棒状和颗粒状,且数量减少,其类型由低碳型碳化物向高碳型碳化物转变。随着(Cr_(3)C_(2)+Ti)含量的提高,熔覆层的硬度先升高后降低,点蚀电位先升高后降低,钝化区宽度先增大后减小。结果表明在Fe-0.3C-15Cr-1Ni合金粉末中添加(Cr_(3)C_(2)+Ti)可显著提高马氏体不锈钢基涂层硬度和耐蚀性能,当(Cr_(3)C_(2)+Ti)含量为0.5%时,熔覆层的综合性能最好。The study aims to improve the hardness and corrosion resistance of Fe-0.3C-15Cr-1Ni alloy coatings.Stainless steel-based and TiC-containing coatings with high hardness and corrosion resistance were in-situ synthesized by the laser cladding technique on the surface of 3Cr13 stainless steel substrate with different contents of(Cr_(3)C_(2)+Ti)(0,0.5%,1%,2%).A Metallographic microscope(OM),a scanning electron microscope(SEM),an X-ray diffractometer(XRD),a microhardness tester,an electrochemical workstation and other equipment were used to study the effects of different contents of(Cr_(3)C_(2)+Ti)on the microstructure,phase composition,hardness distribution and corrosion resistance of the clad layers.The results show that the interfacial metallurgical bonding between the clad layer and the 3Cr13 stainless steel matrix is good.With(Cr_(3)C_(2)+Ti)added,the dendrites and columnar crystals of the clad layer were changed to cytosolic and equiaxed crystals;the carbides were changed from herringbone and massive to rod and granular,from low-carbon carbides to high-carbon carbides and declined in number.With the increase of(Cr_(3)C_(2)+Ti)content,the hardness of the clad layer,the pitting potential and the width of the passivation zone increase first and then decrease.The results show that the addition of(Cr_(3)C_(2)+Ti)to Fe-0.3C-15Cr-1Ni alloy powder can significantly improve the hardness and corrosion resistance of the martensitic stainless steel-based coatings.The overall performance of the clad layer is the best when the(Cr_(3)C_(2)+Ti)content is 0.5%.

关 键 词：激光熔覆 原位合成 TIC 微观组织 显微硬度 耐蚀性能 

分 类 号：TG174[金属学及工艺—金属表面处理]