The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting.
The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting.
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DOI：
10.3390/ma16072926
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发表时间：
2023-04-06
期刊：
影响因子：
--
通讯作者：
Liu Y
中科院分区：
文献类型：
--
作者：
Ouyang X;Liu F;Huang L;Ye L;Dong H;Tan L;Wang L;Jin X;Liu Y
在这项工作中，两个镍基高温合金与13重量%，和35重量%采用选择性激光熔化（SLM）技术制备了Co，研究了Co对增材制造高温合金显微组织和力学性能的影响。随着Co分数从13 wt.%至35重量%，平均晶粒尺寸从25.69 μm减小到17.57 μm，纳米相的尺寸从80.54 nm增大到230 nm。Co使γ/γ′晶格失配度从0.64%降低到0.19%，使γ′相的形貌由长方体变为球形。室温下，13 Co合金的屈服强度和抗拉强度分别为1379 MPa和1487.34 MPa，35 Co合金的屈服强度和抗拉强度分别为1231 MPa和1350 MPa，而伸长率提高了52%。理论计算表明，γ′相的析出强化对强度的贡献最大。
In this work, two Ni-based superalloys with 13 wt.% and 35 wt.% Co were prepared via selective laser melting (SLM), and the effects of Co on the microstructure and mechanical properties of the additively manufactured superalloys were investigated. As the Co fraction increased from 13 wt.% to 35 wt.%, the average grain size decreased from 25.69 μm to 17.57 μm, and the size of the nano-phases significantly increased from 80.54 nm to 230 nm. Moreover, the morphology of the γ′ phase changed from that of a cuboid to a sphere, since Co decreased the γ/γ′ lattice mismatch from 0.64% to 0.19%. At room temperature, the yield strength and ultimate tensile strength of the 13Co alloy reached 1379 MPa and 1487.34 MPa, and those of the 35Co alloy were reduced to 1231 MPa and 1350 MPa, while the elongation increased by 52%. The theoretical calculation indicated that the precipitation strengthening derived from the γ′ precipitates made the greatest contribution to the strength.
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