Solving Recent Challenges for Wrought Ni-Base Superalloys
Solving Recent Challenges for Wrought Ni-Base Superalloys
复制标题
解决锻造镍基高温合金的最新挑战
DOI：
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
S. Tin
中科院分区：
文献类型：
--
作者：
M. Hardy;M. Detrois;E. Mcdevitt;C. Argyrakis;V. Saraf;P. Jablonski;J. Hawk;R. Buckingham;H. Kitaguchi;S. Tin
本文综述了用于关键工程应用的新型变形多晶镍基高温合金的设计和制造技术现状。人们强烈希望开发能够在更高温度下工作的新型合金，以提高热效率，这对于实现减少有害温室气体排放的环境目标是必要的。在航空航天领域，讨论了用于盘式转子和静态应用的新型粉末冶金和铸锭冶金合金的开发。用于粉末冶金的新成分含有约 50 至 55% 的伽马 (γ') 强化沉淀物，以确保部件在高达 788 °C (1450 °F) 的温度下成功运行。相比之下，用于锭冶金的新成分旨在占据合金718和当前使用的粉末合金之间的温度能力设计空间，并且显示出约30至44%的γ'水平。开发这些合金的重点是可制造性设计。为了补充航空航天的发展，国家能源技术实验室的 Detrois、Jablonski 和 Hawk 开展了一项工作审查，以了解候选合金在先进超超临界 (AUSC) 发电厂中多种应用的适用性。在这些发电厂中，蒸汽温度需要达到700°C至760°C。共同点是开发具有高温性能组合的合金，这些性能取决于合金成分和微观结构，并且可以以合适的价格轻松生产。对于 AUSC 应用，重点是高温强度、长期蠕变寿命、相稳定性、抗氧化性和坚固的制造焊接。而对于飞机发动机中的粉末盘转子，首要任务是增强对随时间变化的裂纹扩展的抵抗力、相稳定性和对环境破坏的抵抗力，同时将现有合金所表现出的当前强度水平扩展到更高的温度。
This paper reviews the status of technology in design and manufacture of new wrought polycrystalline Ni-base superalloys for critical engineering applications. There is a strong motivation to develop new alloys that are capable of operating at higher temperatures to realize improvements in thermal efficiency, which are necessary to achieve environmental targets for reduced emissions of harmful green-house gases. From the aerospace sector, the development of new powder metallurgy and ingot metallurgy alloys is discussed for disk rotor and static applications. New compositions for powder metallurgy contain about 50 to 55 pct of gamma prime (γ′) strengthening precipitates to ensure components operate successfully at temperatures up to 788 °C (1450 °F). In contrast, new compositions for ingot metallurgy aim to occupy a design space in temperature capability between Alloy 718 and current powder alloys that are in-service, and show levels of γ′ of about 30 to 44 pct. The focus in developing these alloys was design for manufacturability. To complement the aerospace developments, a review of work to understand the suitability of candidate alloys for multiple applications in Advanced-Ultra Supercritical (AUSC) power plants has been undertaken by Detrois, Jablonski, and Hawk from the National Energy Technology Laboratory. In these power plants, steam temperatures are required to reach 700 °C to 760 °C. The common thread is to develop alloys that demonstrate a combination of high-temperature properties, which are reliant on both the alloy composition and microstructure and can be produced readily at the right price. For the AUSC applications, the emphasis is on high-temperature strength, long-term creep life, phase stability, oxidation resistance, and robust welding for fabrications. Whereas for powder disk rotors in aircraft engines, the priority is enhanced resistance to time-dependent crack growth, phase stability, and resistance to environmental damage, while extending the current strength levels, which are shown by existing alloys, to higher temperatures.
DOI：
10.1007/s11661-018-4682-4
发表时间：
2018-09-01
影响因子：
2.8
作者：
Christofidou, Katerina A.;Hardy, Mark C.;Stone, Howard J.
通讯作者：
Stone, Howard J.