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首页> 外文期刊>Metals and Materials International >Development and Microstructural Characterization of a New Wrought High Entropy Superalloy
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Development and Microstructural Characterization of a New Wrought High Entropy Superalloy

机译：一种新型锻造高熵高温合金的开发和微观结构特征

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In this study, a newly developed gamma ' precipitation hardened high entropy superalloy (designated as HES-A1 hereafter) was produced and its microstructural features were characterized. The new alloy composition is based on the major elements of conventional IN718 alloy, however other elements were added or removed to minimize possible presence of delta (or gamma") phase and increase the volume fraction of very fine gamma ' precipitates instead. Broadening the hot working window, lower density, and avoiding the use of expensive elements were other considerations taken into account in the design of the new alloy. CALPHAD (CALculation of PHAse Diagrams) and PhaComp methods were used for the prediction of phases and their evolutions. The microstructure of the HES-A1 alloy in as-cast, homogenized, hot rolled, annealed and aged conditions were characterized using optical, scanning, and transmission electron microscopes as well as X-ray diffraction technique. The as-cast microstructure of HES-A1 contained 5.5% of Laves phase, which was reduced to less than 0.3% through the development of a homogenization treatment. Hot rolling with reductions up to 36% at 1015 degrees C did not produce any cracking, indicating a good forming potential for the new alloy. The application of double aging treatment, similar to the one for IN718 alloy, showed no presence of gamma" or formation of delta phase in the microstructure. HES-A1 has been designed with a higher Al/(Ti + Nb) ratio and higher proportion of Al + Ti + Nb so that it could be mainly strengthened by gamma ' precipitation. The average size of monomodal gamma ' precipitates was smaller than that observed in conventional alloys after similar treatments. Graphic
机译：在这项研究中，产生了一种新开发的伽马沉淀硬化高熵超合金（以下称为HES-A1），其微观结构特征表征。新的合金组合物基于常规IN718合金的主要元素，但是添加或除去其他元素以最小化δ（或γ“）相的可能存在，并增加非常细的γ'沉淀物的体积分数。展现热工作窗口，较低的密度和避免使用昂贵的元素是在新合金的设计中考虑的其他考虑因素。Calphad（相图的计算）和PhaComp方法用于预测阶段及其演进。微观结构使用光学，扫描和透射电子显微镜以及X射线衍射技术，表征在铸造，均化，热轧，退火和老化条件下的HES-A1合金。 5.5％的疏浚阶段，通过开发均质化治疗减少至小于0.3％。在1015摄氏度下，再轧制高达36％的轧制没有产生任何开裂，表明新合金的良好成型潜力。类似于In718合金的双老化处理的应用显示在微观结构中没有存在γ“或形成δ相的形成。HES-A1设计具有更高的Al /（Ti + Nb）比和更高的比例Al + Ti + Nb，使其主要通过γ'沉淀加强。单阳极γ'沉淀物的平均大小小于在类似治疗后在常规合金中观察到的平均大小。图形

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