采用湿混法将石墨烯纳米片分散到高温合金粉末中,并采用热等静压十热挤压十等温锻造十热处理的方法制备出FGH96镍基粉末高温合金.结果表明:石墨烯纳米片在高温合金中分散均匀,初步发现在后续的热工艺过程中并未发生变性;添加0.1%(质量分数)的石墨烯后,室温抗拉强度和屈服强度分别提高了58MPa和43MPa,塑性从21.0%提高到37.3%;650℃条件下抗拉强度和屈服强度分别提高了58MPa和28MPa,塑性从18.5%提高到26.5%.此外对石墨烯增强FGH96镍基高温合金力学性能的作用机制也进行了进一步分析.
The graphene nanosheets were dispersed in the superalloy powder by using the wet mixing method,and then the nickel based FGH96 P/M superalloy was prepared with hot isostatic pressing (HIP) +hot extrusion(HEX) +hot isothermal forging(HIF) + heat treating(HT) processes.The results show that the graphene well disperses in the superalloy powder and keeps its original form during the following hot processing.After 0.1% (mass fraction) graphene is added,the average room temperature tensile strength and yield strength increase by 58MPa and 43MPa respectively,and the ductility increases from 21.0% to 37.3%;the tensile strength and yield strength at 650℃ increase by 58MPa and 28MPa,and the ductility increases from 18.5% to 26.5%.The mechanism of strengthening and toughening reinforcement was also analyzed based on graphene reinforced FGH96 superalloy.
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