Microstructure and mechanical properties of high chromium nickel-based superalloy fabricated by laser metal deposition
Microstructure and mechanical properties of high chromium nickel-based superalloy fabricated by laser metal deposition
复制标题
激光金属沉积高铬镍基高温合金的显微组织和力学性能
DOI：
10.1016/j.msea.2020.139185
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发表时间：
2020-04-07
期刊：
影响因子：
6.4
通讯作者：
Ju, Jiang
中科院分区：
文献类型：
--
作者：
Wang, Kaiming;Du, Dong;Ju, Jiang
首次采用激光金属沉积（LMD）增材制造高铬（Cr）高温合金K648，并研究了沉积物的微观结构和力学性能。结果表明，K648高温合金的主要物相为γ-Ni、γ'、α-Cr和M23C6。从底部到中部区域的显微组织主要由外延生长的柱状枝晶组成，顶部区域的显微组织主要由等轴晶组成。 LMD K648 高温合金中存在元素偏析。 LMD K648高温合金的平均显微硬度约为220.5HV。 LMD K648高温合金的拉伸强度表现出明显的各向异性特征，最大极限拉伸强度约为833 MPa。
A high chromium (Cr) superalloy, K648, has been additively fabricated by using laser metal deposition (LMD) for the first time, and the microstructure and mechanical properties of the deposits are investigated. The results show that the main phases of the K648 superalloy are gamma-Ni,gamma', alpha-Cr ad M23C6. The microstructure from the bottom to the middle region is mainly composed of epitaxially grown columnar dendrites, and the microstructure in the top region is mainly equiaxed grains. Element segregation exists in the LMD K648 superalloy. The average microhardness of the LMD K648 superalloy is about 220.5HV. The tensile strengths of LMD K648 superalloy show obvious anisotropic characteristics and the maximum ultimate tensile strength is about 833 MPa.