少量Mo添加对Fe-0.5Mn-0.5C烧结钢组织和力学性能的影响  

Effect of small amount of Mo addition on microstructure and mechanical properties of Fe-0.5Mn-0.5C sintered steels

作　　者：陈荟竹[1] 李松林[1] 王行[1] 龙安平[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2014年第5期784-789,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：湖南省科技计划项目(2014GK3110);国家高技术研究发展计划(863)资助项目(2013AA031102)

摘　　要：采用粉末冶金方法,经1 150℃、H2气氛烧结1 h制得Fe-0.5Mn-xMo-0.5C(x=0,0.25,0.4,0.5)合金。通过金相组织观察、扫描电镜分析及力学性能测试,研究Mo添加对Fe-0.5Mn-0.5C烧结钢显微组织和力学性能的影响规律。结果表明:添加少量的Mo(≤0.5%,质量分数)可以同时提高Fe-0.5Mn-0.5C的烧结密度、抗拉强度、硬度和伸长率。当Mo含量为0.5%时,烧结体的烧结密度、抗拉强度、硬度和伸长率分别达到最大值7.10 g/cm3、426 MPa、92.2 HRB和7.58%。Mo可促进Fe-0.5Mn-0.5C坯体的致密化过程,随Mo含量增加,烧结体的显微组织中珠光体数量增加,片层间距减小;断口形貌图中解理面面积减小,韧窝数量增加。Powder metallurgy Fe-0.5Mn-xMo-0.5C （x=0, 0.25, 0.4, 0.5） alloys were prepared by sintering the compact at 1 150 ℃ in H2 for 1 h. The effect of Mo addition on microstructure and mechanical properties of Fe-0.5Mn-0.5C sintered steels were analyzed by optical microscope, scanning electron microscope and mechanical properties testing. The results show that small amount of Mo addition （mass fraction ≤0.5%） can improve the sintered density, tensile strength, hardness and elongation of sintered parts simultaneously. When Mo content is 0.5%, the sintered density, tensile strength, hardness and elongation of the sintered parts reach maximum value of 7.10 g/cm3, 426 MPa, 92.2 HRB and 7.58%, respectively. These results come from the facts that Mo can promote the densification of Fe-0.5Mn-0.5C compacts. With Mo content increasing, the amounts of pearlites increase with narrower lamella space; the fraction of cleavage facets decreases and the number of dimples on the fractures of samples increases.

关 键 词：粉末冶金 烧结锰钢 钼 力学性能 

分 类 号：TG145[一般工业技术—材料科学与工程]