Abstract

Samples of Ni-based super alloy are received by the method of direct metal deposition. Annealing at temperature 1180°С during 4 h is provided. Measurements of hardness, optical metallography, X-ray analysis are carried out. It was found that direct metal deposition of samples from Ni-based super alloy EP648 lead to Ni solid solution of alloying elements with face-centered cubic structure having lattice period a = 7.11 Å, also structure of Ni₂Cr, is slightly revealed by optical metallography. Annealing at temperature 1180°С during 4 h of the direct metal deposited samples of super alloy EP648 lead to hardness increasing from от 19 ± 4 HRC to 34 ± 0.3 HRС, the uniformity of values are observed. After annealing the face-centered cubic structure is revealed, high value of lattice period is saving; presence of the phase Ni₂Cr and sedimentation of Ni₃Cr₂ are found. Residual tensile macro stresses are found.

中文翻译：

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退火对EP648合金直接金属沉积后显微组织和硬度的影响

摘要

采用直接金属沉积方法获得镍基高温合金样品。提供 1180°С 温度下 4 小时的退火。进行硬度测量、光学金相分析、X 射线分析。结果发现，镍基高温合金EP648样品的直接金属沉积导致合金元素Ni固溶体具有面心立方结构，其晶格周期a = 7.11 Å，也是Ni ₂ Cr的结构，通过光学轻微揭示金相学。对超级合金 EP648 的直接金属沉积样品在 1180°С 温度下退火 4 小时，硬度从 19 ± 4 HRC 增加到 34 ± 0.3 HRС，观察到值的均匀性。退火后显露出面心立方结构，节省高晶格周期值；发现Ni ₂ Cr相的存在和Ni ₃ Cr _{2的沉积。}发现残余宏观拉伸应力。