铸造烧结法制备TiC颗粒增强铁基复合材料的磨损性能  

Wear properties of TiC particle reinforced iron matrix composites prepared by casting sintering method

作　　者：孙雪莉 王帅 刘晨宇 付志强[1] 郑开宏 王娟 柯志敏 Sun Xueli;Wang Shuai;Liu Chenyu;Fu Zhiqiang;Zheng Kaihong;Wang Juan;Ke Zhimin(School of Engineering and Technology,China University of Geosciences,Beijing 100083,China;National Engineering Research Center of Powder Metallurgy of Titanium&Rare Metals,Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,Guangdong,China;Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application,Guangdong Provincial Engineering Research Center of Steel Matrix Composites,Guangzhou 510650,Guangdong,China;Guangdong Zhongtian Chuangzhan Ductile Iron Co.,Ltd.,Qingyuan 513000,Guangdong,China)

机构地区：[1]中国地质大学(北京)工程技术学院,北京100083 [2]国家钛及稀有金属粉末冶金工程技术研究中心,广东省科学院新材料研究所,广东广州510650 [3]广东省金属强韧化技术与应用重点实验室,广东省钢铁基复合材料工程研究中心,广东广州510650 [4]广东中天创展球铁有限公司,广东清远513000

出　　处：《钢铁钒钛》2023年第6期70-75,共6页Iron Steel Vanadium Titanium

基　　金：国家重点研发计划(2021YFB3701204);广东省科学院发展专项资金项目(2022GDASZH-2022010103);清远市科技计划项目(2023DZX013);广西科技重大专项(桂科AA23023017)。

摘　　要：通过铸造烧结法制备TiC颗粒增强高铬铸铁基复合材料,采用EDS、SEM等检测手段研究增强颗粒对材料显微组织和磨损行为的影响规律。结果表明,与高铬铸铁相比,复合材料中由于TiC颗粒的存在使其洛氏硬度(HRC)从49提高到了60。在磨损过程中,高铬铸铁表面的M7C3型碳化物在磨粒的反复作用下出现了明显的裂纹,并逐渐向基体内扩展。破碎后的碳化物容易脱落,不能有效阻止磨粒在材料表面的犁削作用,加剧了材料的磨损。而在复合材料中,随着较软的基体相优先被磨料削除,会裸露出大量的TiC颗粒。这些表面凸起的TiC颗粒承担磨粒的主要破坏作用,从而有效保护基体材料。对比发现,在相同的磨损条件下,复合材料的耐磨性与高铬铸铁相比提高了1.95倍。TiC particles reinforced high chromium cast iron matrix composites were prepared by casting sintering method.The effects of reinforced particles on the microstructure and wear behavior of the composites were studied by EDS and SEM.The results showed that the Rockwell hardness(HRC)of the composites increases from 49 to 60 compared with high chromium cast iron,due to the presence of TiC particles.During the wear process,the M_7C_3 carbides on the surface of high chromium cast iron appeared obvious cracks under the repeated action of abrasive particles,and gradually expanded into the matrix.The broken carbides are easy to fall off,which cannot effectively prevent the ploughing effect of abrasive particles on the surface of the material and aggravate the wear of the material.In the composites,a large number of TiC particles are exposed as the softer matrix phase is preferentially removed by the abrasive.These surface convex TiC particles bear the main damage of the abrasive particles,thus effectively protecting the matrix material.Through experimental comparison,it is found that the wear resistance of the composites is 1.95 times higher than that of high chromium cast iron under the same wear conditions.

关 键 词：高铬铸铁基复合材料 TiC增强颗粒 原位反应 洛氏硬度 三体磨损 

分 类 号：TB331[一般工业技术—材料科学与工程]