有序排列硬质合金颗粒增强铁基复合材料的研究  

Investigation on Ordered Arrangement of Cemented Carbide Particles Reinforced Iron Matrix Composites

作　　者：杨建业 谢鲲[1,2] 岳丽杰[1] 夏鹏成[1] 曹梅青[1] 谭云亮[2] YANG Jian-ye;XIE Kun;YUE Li-jie;XIA Peng-cheng;CAO Mei-qing;TAN Yun-liang(School of Materials Science and Engineering,Shandong University of Science and Technology,Shandong Qingdao 266590,China;State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Shandong Qingdao 266590,China)

机构地区：[1]山东科技大学材料科学与工程学院,山东青岛266590 [2]山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛266590

出　　处：《表面技术》2023年第1期132-140,共9页Surface Technology

摘　　要：目的研究有序排列硬质合金颗粒作为增强相对高铬铸铁组织与性能的影响。方法采用对WC-Co硬质合金颗粒进行预先排布固定的方式,结合离心铸造制备了有序排列硬质合金颗粒增强高铬铸铁复合材料。通过相组成和显微组织的演变分析复合材料的形成过程,并对摩擦磨损性能进行研究。结果制备的复合材料实现了硬质合金颗粒在基体上的有序排列及与基体的冶金结合。存在由颗粒表层熔解区和碳化物散布区构成的梯度过渡层,硬度也呈梯度变化,有利于降低应力集中。在载荷为100 N时,复合材料的体积磨损量相较于高铬铸铁降低了57.6%;载荷为150 N时,复合材料的体积磨损量相较于高铬铸铁降低了69.2%,硬质颗粒的有序排列可减缓磨粒磨损和剥层磨损。结论通过对增强颗粒进行有序排列,可提高复合材料性能的可设计性,抑制了过度反应,并促进梯度过渡层的形成,同时还可减少硬质颗粒的用量,改善复合材料的韧性。有序排列硬质合金颗粒可以有效提高高铬铸铁的硬度和耐磨性。Because WC is easy to react with Fe and other elements and form brittle phase,WC reinforced composites have the problem of insufficient toughness.The use of WC-Co cemented carbide particles is conducive to reduce the reaction between metal and WC,which makes the bonding between reinforcement particles and matrix more firm.For particle reinforced composites,the arrangement of strengthening phases has a great influence on the strengthening effect.The ordered arrangement of the reinforcement particles in the composites can avoid the agglomeration of the reinforcing phase,reduce stress concentration,and improve the comprehensive mechanical properties of the composites.The high chromium cast iron composites reinforced by ordered arrangement of cemented carbide particles were fabricated by centrifugal casting with the way of pre-arranging and pre-fixing WC-Co cemented carbide particles.The work aims to study the effect of ordered arrangement of cemented carbide reinforcements on the micro-structure and properties of high chromium cast iron.Before the experiment,the surface of high chromium cast iron was polished with sandpaper,then cleaned with ethanol.The oil stain,oxide and other impurities on the surface of WC-Co cemented carbide particles were cleaned with alkali solution.Then the cemented carbide particles were arranged into an array structure at a spacing of about 4 mm,and preseted on the inner surface of the vertical centrifugal casting mold.After the cleaned high chromium cast iron of 500 g was melted in an induction furnace,it was poured into the mold for centrifugal casting to obtain a ring-shaped ingot.The pouring temperature was 1400℃,and the rotating speed of the centrifugal casting mold was 1392 r/min.The samples with the cross section were cut with electric spark wire cutting(DK3332),ground and polished.Then they were corroded with 6%nital solution.The microstructure of the composites was observed by electron probe(JXA-8230)and a scanning electron microscope(Apreo S HiVac).The component is analyzed by

关 键 词：有序排列 颗粒增强 金属基复合材料 硬质合金 耐磨性 

分 类 号：TB331[一般工业技术—材料科学与工程]