热处理对Fe3Al-5Cr合金微观组织及性能的影响  

Effect of Heat Treatment on Microstructure and Properties of Fe3Al-5Cr Alloy

作　　者：成超 白亚平[1] 李建平[1] 郭永春[1] 杨忠[1] CHENG Chao;BAI Yaping;LI Jianping;GUO Yongchun;YANG Zhong(School of Materials and Chemical Engineering,Xi’an TechnologicalUniversity,Xi’an 710021,China)

机构地区：[1]西安工业大学材料与化工学院

出　　处：《西安工业大学学报》2019年第3期289-296,共8页Journal of Xi’an Technological University

基　　金：国家自然科学基金(51705391);陕西省教育厅专项科学研究计划项目(17JK0383);装备预研领域基金(6140922010301);陕西省创新人才推进计划科技创新团队项目(2017KCT-05)

摘　　要：为了改善Fe3Al5Cr(原子百分比a/%)材料韧性和室温磨损性能,通过机械合金化和热压烧结相结合制备了Fe3Al与Fe3Al5Cr块状试样,对其分别进行两种不同热处理:加热至550℃和950℃均保温8h后炉冷至室温;采用VEGA·ⅡXMU扫描电子显微镜和XRD6000岛津X射线衍射仪对其进行显微组织及物相组成分析,采用WD404显微维氏硬度试验机进行维氏硬度测试,采用DDL300电子万能试验机和MMG500高温真空三体磨损试验机对其进行压缩和磨损性能测试.研究结果表明:未经热处理的Fe3Al5Cr相对于基体Fe3Al晶粒更均匀细小,韧性增加,但压缩强度、显微硬度和磨损行为均有所降低;热处理后其显微组织和性能均有改善,尤其经950℃热处理后Fe3Al5Cr压缩强度提高23%和显微硬度提高4%,同时室温油润滑条件下,其摩擦系数和磨损率分别降低了82%和40%,此时磨损性能更佳,其磨损失效机制以显微切削为主,并伴随少量氧化磨损.The study aims to improve toughness and room temperature wear properties of Fe 3Al 5Cr.Fe 3Al and Fe 3Al 5Cr bulk samples were prepared by mechanical alloying and hot pressing sintering,and the samples were heated to 550 ℃ and 950 ℃ for 8h and then cooled to room temperature.Their microstructure and phase composition were analyzed with a VEGA·ⅡXMU scanning electron microscope and an XRD 6000 X ray diffractometer,their microhardness was tested by using a WD 404 microhardness tester,and their compress and wear properties were tested by using a DDL300 electronic universal testing machine and an MMG 500 high temperature vacuum three body wear testing machine.The results show that the crystalline grains of Fe 3Al 5Cr without being heat treated were more uniform and finer than those of Fe 3Al matrix.Its toughness increased but there was a reduction in its compression strength,microhardness and wear behavior.After having been heat treated,its microstructure and properties were improved.Especially after heat treatment at 950 ℃ its compression strength and microhardness increased by 21% and 4% respectively.In addition,its friction coefficient and wear rate decreased by 82% and 40% respectively under the condition of room temperature oil lubrication.Its failure mechanism of wear was mainly micro cutting,with a little oxidation wear.

关 键 词：Fe3Al5Cr 热处理 显微组织 磨损行为 

分 类 号：TG146.2[一般工业技术—材料科学与工程]