Understanding, Developing and Exploiting Cobalt Superalloys for Discs

了解、开发和利用用于圆盘的钴高温合金

• 批准号: EP/L001748/1
• 负责人: David Dye
• 金额: $ 32.21万
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2013
• 资助国家: 英国
• 起止时间: 2013 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FL001748%2F1
• 关键词: Understanding; Developing; Exploiting; Cobalt; Superalloys

In 2005, the discovery of a new intermetallic was announced in Science, Co3(Al,W), together with evidence Co-Co3(Al,W) alloys might have a higher temperature capability than in the Ni-base superalloys used in jet engines. It was claimed that this would allow a new generation of gas turbine alloys to be developed beyond Ni-base superalloys. However, these alloys and those developed since have densities that are too high and oxidation resistance that is too poor for engineering application. Over the past two years, as part of the Rolls Royce - EPSRC Strategic Partnership, two PhD students at Imperial College have demonstrated that a lower density, oxidation resistant Co-base superalloy can be developed, which still has a superior temperature capability.The aim of the current work is to develop the underpinning science underlying the effect of alloying on the creep behaviour of these alloys, which is principally a function of the way in which deformation-related defects called dislocations move through the structure and in particular the way they interact with the intermetallic precipitate. Our recent work has demonstrated that this interface is not sharp and instead has a width that varies with alloying from 0.4 to over 2nm, a factor of over 5X. It is expected that this will increase the rate at which these intermetallic precipitates grow in size - from 20nm to over 200nm - in service, which in turn is a major driver for strength and creep resistance.

2005年，在科学，二氧化碳（AL，W）中宣布了新的金属间质量，以及证据COCO3（AL，W）合金的温度能力可能比喷气发动机中使用的NI-BASE SUPERALES具有更高的温度能力。据称，这将允许新一代的燃气轮机在Ni-Base Superalloys之外开发。但是，这些合金和这些合金的密度过高，耐氧化性的耐药性对于工程应用而言太差。在过去的两年中，作为劳斯莱斯 - EPSRC战略合作伙伴关系的一部分，帝国学院的两名博士学位学生表明，可以开发出较低的密度，耐氧化的抗氧化耐药性超级合金，这仍然具有较高的温度能力。称为位错的缺陷在结构中移动，尤其是它们与金属间沉淀物相互作用的方式。我们最近的工作表明，该界面并不锋利，而具有合金从0.4到2nm（超过2nm）（超过5倍）不等的宽度。预计这将增加这些金属间沉淀的尺寸的速率 - 从20nm到200nm以上，这又是强度和抗蠕变性的主要驱动力。

项目成果

Femtosecond quantification of void evolution during rapid material failure.

• DOI: 10.1126/sciadv.abb4434
• 发表时间: 2020-12
• 期刊: Science advances
• 影响因子: 13.6
• 作者: Coakley J;Higginbotham A;McGonegle D;Ilavsky J;Swinburne TD;Wark JS;Rahman KM;Vorontsov VA;Dye D;Lane TJ;Boutet S;Koglin J;Robinson J;Milathianaki D
• 通讯作者: Milathianaki D

Characterisation of short fatigue cracks in titanium alloy IMI 834 using X-ray microtomography

• DOI: 10.1016/j.actamat.2015.07.069
• 发表时间: 2015-10
• 期刊: Acta Materialia
• 影响因子: 9.4
• 作者: T. Chapman;K. Kareh;M. Knop;T. Connolley;P. Lee;M. Azeem;D. Rugg;T. C. Lindley;D. Dye

A New Polycrystalline Co-Ni Superalloy

• DOI: 10.1007/s11837-014-1175-9
• 发表时间: 2014-10
• 期刊: JOM
• 影响因子: 2.6
• 作者: M. Knop;P. Mulvey;F. Ismail;A. Radecka;K. Rahman;T. C. Lindley;B. Shollock;M. Hardy;M. Moody;Tomas L Martin;P. Bagot;D. Dye

Insights into microstructural interfaces in aerospace alloys characterised by atom probe tomography

通过原子探针断层扫描深入了解航空航天合金的微观结构界面

• DOI: 10.1179/1743284715y.0000000132
• 发表时间: 2016
• 期刊: Materials Science and Technology
• 影响因子: 1.8
• 作者: Martin T

Isothermal omega kinetics in beta-titanium alloys

• DOI: 10.1080/09500839.2017.1282633
• 发表时间: 2017-01
• 期刊: Philosophical Magazine Letters
• 影响因子: 1.2
• 作者: J. Coakley;B. Seong;D. Dye;M. Ohnuma