TiC含量对铁基复合材料力学性能及耐磨性能的影响  

Effect of TiC Contents on Mechanical Properties and Wear Resistance of Iron-Based Composites

作　　者：董虎林 包海萍 彭建洪[1] DONG Hulin;BAO Haiping;PENG Jianhong(Department of Physics and Electron Information Engineering, Qinghai University for Nationality, Xining 810007, China)

机构地区：[1]青海民族大学物理与电子信息工程学院

出　　处：《金属学报》2019年第8期1049-1057,共9页Acta Metallurgica Sinica

基　　金：国际科技合作项目No.2015DFR50990;青海省国际科技合作专项项目Nos.2014-HZ-819和2015-HZ-811~~

摘　　要：利用机械合金化(MA)和真空热压烧结(HP)的方法,以Ti粉、石墨粉和灰铸铁粉为初始原料,原位合成了TiC颗粒增强的铁基复合材料。利用XRD和FESEM (附带EDS)研究了复合材料的物相成分、微观结构和增强体的分布情况。利用密度测试仪、洛氏硬度计、电子万能试验机和销-盘式两体磨料磨损试验机分别测试了复合材料的密度、硬度、压缩应力-应变和抗两体磨料磨损性能。结果表明:在70 MPa压力下于1200℃烧结60 min制备的原位TiC颗粒增强的铁基复合材料只含TiC和α-Fe,并且TiC颗粒弥散均匀分布于Fe基体中。当原位TiC的含量为40%(质量分数)时,该复合材料的综合性能最佳,其相对密度和硬度分别达到96.54%和34 HRC (未热处理);同时压缩性能也最佳,其压缩弹性模量、屈服强度、最大压缩强度和断裂应变分别为19.6 GPa、420 MPa、605 MPa和6.1%;其具有最好的耐磨性能,当载荷为1.5 kg时,其相对耐磨性是纯灰铸铁的2.67倍。The TiC particle reinforced iron-based composite materials were prepared by mechanical alloying(MA) and vacuum hot-pressing(HPing) using titanium(99.9%, 75 mm), graphite(>99.9%, 10 mm)and grey cast iron(>99.5%, 25 mm) powders as starting materials. And TiC particles were also in situ synthesized during HPing. The phase composition, microstructures and distribution of TiC of as-fabricated composite materials were investigated using XRD and FESEM equipped with EDS. The density, hardness,compressive stress-strain and two-body abrasive wear behavior of as-fabricated composite materials were tested using densitometer, rockwell hardness tester, electro-mechanical universal testing machines and pin-on-disk type two body abrasive wear tester, respectively. The results confirm that the in situ synthesized TiC particulate reinforced iron-based composite materials only have TiC and α-Fe phases when sintered at 1200 ℃ for 60 min at the pressure of 70 MPa. The TiC particles were dispersed homogeneously in the iron matrix. The composite with TiC content of 40%(TiC40/Fe) possesses the best comprehensive performance among all as-produced TiC/Fe composites. Its relative density and hardness are 94% and 34 HRC(without heat treatment), respectively. And the compressive property of the TiC40/Fe composite is the best too. Its elastic modulus, yield strength, maximum compressive strength and fracture strain are 19.6 GPa,420 MPa, 605 MPa and 6.1%, respectively. The TiC40/Fe composite has the best wear resistance, especially at 1.5 kg load, its relative wear resistance is 2.67 times higher than that of pure grey casting iron.

关 键 词：原位反应 TIC/FE复合材料 力学性能 耐磨性能 

分 类 号：TB333[一般工业技术—材料科学与工程]