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首页> 外文期刊>Journal of Materials Engineering and Performance >The Effect of δ Phase on the Mechanical Properties of an Inconel 718 Superalloy
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The Effect of δ Phase on the Mechanical Properties of an Inconel 718 Superalloy

机译：δ相对Inconel 718高温合金力学性能的影响

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摘要

The relationship between the δ phase content and the mechanical properties of Inconel 718 superalloy is still uncertain in the scientific literature. This study investigated the effects of the amount of δ phase and of the grain size on the mechanical properties of an aged γ-matrix with γ' and γ" precipitates. The material in as-received condition in the form of a forged bar was solution-treated in different conditions and aged according to UNS7718 standard. The microstructures were characterized using optical, scanning, and transmission electron microscopy. Hardness and tensile tests were also conducted. After solution treatment, γ' and γ" phases are dissolved and δ phase volume fraction is reduced to a minimum amount only observed by TEM, resulting in an increase of the grain size and a decrease of hardness and strength. After aging, the precipitation of γ' and γ" occurs and the amount of δ phase increases. The volume fraction of δ phase varying from 0.30 to 1.38% and the grain size varying from ASTM 7 to 5 do not have a significant effect on the tensile properties and hardness.
机译：科学文献中仍不确定δ相含量与Inconel 718高温合金力学性能之间的关系。这项研究研究了δ相的数量和晶粒尺寸对带有γ'和γ“沉淀物的时效γ矩阵的力学性能的影响。处于接收状态的锻造棒状材料为固溶体根据UNS7718标准在不同的条件下进行了处理并进行了时效处理，通过光学，扫描和透射电子显微镜对显微组织进行了表征，还进行了硬度和拉伸试验。固溶处理后，γ'和γ“相溶解并且δ相体积增大分数减少到仅通过TEM观察到的最小量，导致晶粒尺寸增加并且硬度和强度降低。时效后，出现γ'和γ“的沉淀，δ相的数量增加。δ相的体积分数在0.30至1.38％之间变化，晶粒尺寸在ASTM 7至5之间变化对合金没有显着影响。拉伸性能和硬度。

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