锻造温度对含钼粉末热锻合金显微组织及力学性能的影响  

Effect of forging temperature on microstructure and mechanical properties of powder hot-forged alloy contained molybdenum

作　　者：孙露[1] 张继峰 邱天旭 申小平 SUN Lu;ZHANG Ji-feng;QIU Tian-xu;SHEN Xiao-ping(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》2020年第3期174-182,共9页Powder Metallurgy Technology

摘　　要：采用粉末热锻工艺制备Fe-1C-2Cu-x Mo(x=0.50,0.85,1.46,质量分数)合金,分析锻造温度和Mo质量分数对烧结态及锻造态合金密度、显微组织、静态力学性能和动态摩擦性能的影响。结果表明:锻造工艺能够有效提高材料密度,锻后合金相对密度可达到98.5%,锻态合金组织主要由贝氏体、马氏体和残余奥氏体组成。合金硬度随Mo质量分数的增加而提高,随锻造温度的升高先降低后提高,1050℃锻造Fe-1C-2Cu-1.46Mo合金硬度可达HRB 116.38。Mo质量分数和锻造温度共同影响合金横向断裂强度,1000℃锻造Fe-1C-2Cu-0.50Mo合金强度最高可达2608 MPa,合金断裂方式为韧脆混合型断裂。材料动态摩擦性能随Mo质量分数的增加显著提升,当锻造温度为950℃且Mo质量分数为1.46%时,材料的摩擦系数仅为0.088,明显低于其他材料且波动较小。Fe-1 C-2 Cu-x Mo(x=0.50,0.85,1.46,mass fraction)alloys were fabricated by powder hot-forging in this paper.The effect of forging temperature and Mo content by mass on the density,microstructure,static mechanical properties,and dynamic friction properties of the alloys were investigated.In the results,the forging can effectively increase the density of alloys,and the relative density can reach 98.5%after forging.The microstructure is mainly composed of bainite,martensite,and retained austensite.The hardness of alloys increases with the increase of Mo content,and decreases first and then increases with the increase of forging temperature.The hardness of Fe-1 C-2 Cu-1.46 Mo alloys forged at 1050℃reaches the maximum value of HRB 116.38.The transverse rupture strength is jointly affected by the Mo content by mass and forging temperature,the maximum strength of Fe-1 C-2 Cu-0.50 Mo alloys forged at 1000℃can reaches 2608 MPa,and the fracture mode of alloys is the mixture of ductile and brittle fracture.As the increase of Mo content,the dynamic friction properties increase significantly.The friction coefficient of Fe-1 C-2 Cu-1.46 Mo alloys forged at 950℃is only 0.088,which is obviously lower than that of others with the smaller fluctuation.

关 键 词：粉末热锻 显微组织 静态力学性能 动态摩擦性能 

分 类 号：TG142.71[一般工业技术—材料科学与工程]