HIP-Re组织和力学性能.PDF

HIP-Re组织及力学性能 石摇 刚摇 摇 贾文军摇 摇 崔摇 鹏 (航天材料及工艺研究所,北京摇 100076) 文摇 摘摇 采用粉末冶金热等静压技术制备了HIP-Re 纯铼材料,分析了不同热处理状态对材料微观结构 及室温和高温性能的影响。 结果表明,热处理温度对材料拉伸性能影响较大,经1800益/ 1.5 h真空处理HIP- Re抗拉强度达到1 196 MPa,伸长率为19.1%;2000益抗拉强度达到69 MPa,伸长率达17%以上。 粉末冶金 铼的晶粒组织多为2~8 滋m 细小等轴晶,HIP-Re 断裂方式为沿晶断裂与穿晶断裂共同作用,高温断裂方式为 晶间断裂与滑移断裂,在拉伸形变过程中,Re材料内部产生了大量协变的裂纹及微孔,裂纹扩展连接导致断 裂。 关键词摇 铼,热等静压,粉末冶金,微观组织,拉伸性能 Microstructure and Mechanical Properties of HIP鄄Re Metal Shi Gang摇 摇 Jiawenjun摇 Cui Peng (Aerospace ResearchInstitute of Materials Processing Technology,Beijing摇 100076) Abstract摇 Pure HIP-Re metal were prepared by powder metallurgy HIP method,and the microstructure and tensile properties at room temperature and 2 000益 of specimens after different heat treatment procedure. It can be found that different heat treatment procedures affect the resulting tensile properties significantly. The results indicate HIP-Re specimens heating treatmentof 1800益/ 1.5hexhibitthegreatestultimatestrengthandelongationwith 1196 MPa and 19.1% at room temperature,the high temperature2000益 tensile propertiesof69 MPa and 17%,respec鄄 tively. ThePM Re metal microstructure exhibitfine and equiaxed grainswith the size of2 to8 滋m,a mixtured of in鄄 tergranular and transgranular fracture is observed for HIP-Re metal fractured at room temperature,and the dominant fracture mechanism at high temperature in the HIP-Re metal are intergranular fracture and slip during deformation with a lot of porosity and micocracks occurring. Abstract摇 Re,HIP,Powder metallurge,Microstructure,Tensilel properties 0摇 引言 Re材构件制备又细分为粉末烧结法、热等静压法和 3 Re为密度21.02 g/ cm 的稀散难熔金属,熔点为 粉冶冷轧法,一般 Re 丝和Re 片用粉末冶金法加工 3 180益。 Re材料性能优异,2 200益时抗拉强度可保 后经多次冷轧成形[10-11]。 CVD 与EF 多用来沉积 持在40 MPa 以上,从极高温度立即