C与Cr含量对粉末锻造Fe-Cu-C-Cr合金组织和物理性能影响  

Effects of C and Cr contents on microstructure and physical properties ofpowder forged Fe-Cu-C-Cr alloys

作　　者：万霖 张继峰 孙露 邱天旭 申小平 WAN Lin;ZHANG Jifeng;SUN Lu;QIU Tianxu;SHEN Xiaoping(School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Engineering Training Center,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学材料科学与工程学院,南京210094 [2]南京理工大学工程训练中心,南京210094

出　　处：《粉末冶金技术》2023年第6期508-515,共8页Powder Metallurgy Technology

基　　金：国家自然科学基金资助项目(50971057,51371099)。

摘　　要：通过改变粉末锻造Fe-Cu-C-Cr合金中C、Cr的质量分数,研究C、Cr含量对合金组织和物理性能的影响。结果表明:在不添加Cr的情况下,合金的组织主要为铁素体和渗碳体,合金硬度和抗拉强度随C含量的增加小幅增加,C含量对合金最终摩擦系数的影响不大;添加Cr元素后,合金密度降低,组织也较为复杂,合金硬度随Cr含量的增加而增加,最高可达HRA68.6。C和Cr共同影响合金高温抗拉强度,Fe-2Cu-0.5C-5Cr抗拉强度最高,为378 MPa。合金摩擦系数随Cr含量的增加而减小,当Cr质量分数为10%时,合金最终摩擦系数为0.195,磨损方式为氧化磨损和少量的磨粒磨损。The effects of C and Cr contents on the microstructure and physical properties of the powder forged Fe-Cu-C-Cr alloys were studied by changing the mass fraction of C and Cr elements.The results show that,the microstructures of the alloys are mainly composed of ferrite and cementite without Cr element,and the hardness and tensile strength of the alloys increase slightly with the increase of C content,showing little effect on the final friction coefficient of the alloys.After adding the Cr element,the alloy density decreases and the microstructure is more complex.The alloy hardness increases with the increase of Cr content,up to HRA 68.6.The high temperature tensile strength of the alloys is influenced by C and Cr,the tensile strength of Fe-2Cu-0.5C-5Cr is the highest(378 MPa).The friction coefficient of the alloys decreases with the increase of Cr content.When the mass fraction of Cr is 10%,the final friction coefficient is 0.195,the wear mode is mainly oxidation wear with a small amount of abrasive wear.

关 键 词：粉末锻造 Fe–Cu–C–Cr合金 元素含量 物理性能 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TF125[金属学及工艺—金属材料]