Abstract The research of Nickel-based superalloys with excellent mechanical properties is of significance for aerospace. Here we report the effect of sintering temperature of 850 °C, 900 °C and 950 °C with the heating rate of 100 °C/min via spark plasma sintering (SPS) on Inconel 718 (IN718) superalloy reinforced with 0.25 wt. % reduced oxide graphene (RGO). The microstructures and mechanical properties of IN718-RGO composite were investigated by scanning electron microscopy (SEM) and MTS servo hydraulic testing machine, respectively. SEM results demonstrate that the RGO is almost uniformly distributed into the IN718 powders after 3D rock-milling for 8 h. The mechanical properties of the composite increase with increasing the sintering temperature. When the sintering temperature is 950 °C, a relative density of 92.5%, a microhardness of 375 Hv and an ultimate compressive strength of 1748.20 MPa after aging heat treatment was obtained for the IN718–0.25 wt. % RGO, respectively. The fracture mechanism of the composite changes from intergranular fracture to transgranular fracture with the sintering temperature increasing.

中文翻译：

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温度对放电等离子烧结还原氧化石墨烯增强IN718显微组织和力学性能的影响

摘要 研究具有优异力学性能的镍基高温合金对航空航天具有重要意义。在这里，我们报告了 850 °C、900 °C 和 950 °C 的烧结温度以及 100 °C/min 的加热速率通过放电等离子烧结 (SPS) 对用 0.25 重量％增强的 Inconel 718 (IN718) 高温合金的影响。% 还原氧化石墨烯 (RGO)。分别采用扫描电子显微镜(SEM)和MTS伺服液压试验机研究了IN718-RGO复合材料的微观结构和力学性能。SEM 结果表明，在 3D 岩石研磨 8 小时后，RGO 几乎均匀分布到 IN718 粉末中。复合材料的力学性能随着烧结温度的升高而增加。当烧结温度为950℃时，相对密度为92.5%，IN718-0.25 wt. 时效热处理后显微硬度为 375 Hv，极限抗压强度为 1748.20 MPa。% RGO，分别。随着烧结温度的升高，复合材料的断裂机制由沿晶断裂转变为穿晶断裂。