Design of an Eta-Phase Precipitation-Hardenable Nickel-Based Alloy with the Potential for Improved Creep Strength Above 1023 K (750 °C)
Design of an Eta-Phase Precipitation-Hardenable Nickel-Based Alloy with the Potential for Improved Creep Strength Above 1023 K (750 °C)
复制标题
具有提高 1023 K (750 °C) 以上蠕变强度潜力的 eta 相沉淀硬化镍基合金的设计
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
C. L. White
中科院分区：
文献类型：
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作者：
Matthew Wong;P. Sanders;J. Shingledecker;C. L. White
在许多伽马素(γ‘)强化的镍基高温合金系统中，在长期高温暴露过程中形成了eta相(Ni3Ti，η)，但其对力学性能的影响还没有很好的表征。利用热力学建模和实验设计技术，对镍基高温合金Nimonic(Nimonic®是特殊金属公司集团公司的商标)进行了三种修改。263发现，在1023K(750°C)以上的温度下，生成的EtA相(Ni3Ti，η)的体积分数增加。利用光学显微镜、扫描电子显微镜、能谱仪和X射线衍射仪对每种合金的η相的体积分数和热处理条件进行了评估。与Nimonic 263相比，添加少量的V和Ta可以将1023K(750℃)以上的η相的体积分数从大约5%增加到15%以上，从而为未来的力学行为实验研究提供了一条途径，这不在本工作的范围内。
In a number of nickel-based superalloy systems strengthened by gamma prime (γ′), eta-phase (Ni3Ti, η) forms during prolonged high-temperature exposure, but its effect on mechanical properties is not well characterized. Using thermodynamic modeling and design-of-experiments techniques, three modifications of the nickel-based superalloy Nimonic (Nimonic® is a trademark of Special Metals Corporation group of companies.) 263 were identified that yield increased volume fractions of the eta-phase (Ni3Ti, η) at temperatures above 1023 K (750 °C). Volume fractions of η-phase were evaluated for each alloy and heat-treatment condition using optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. Compared to Nimonic 263, small additions of V and Ta were found to increase the volume fraction of η-phase above 1023 K (750 °C) from approximately 5 pct to above 15 pct, thus providing a route for future mechanical behavior experimental studies, which was not in the scope of this work.