Experimental and modelling methodologies for fatigue crack nucleation around non-metallic inclusions in polycrystalline Ni-base superalloy.

多晶镍基高温合金中非金属夹杂物周围疲劳裂纹形核的实验和建模方法。

• 批准号: 2275327
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2275327
• 关键词: Experimental; modelling; methodologies; fatigue; crack

Powder metallurgy has become the preferred method for producing nickel-superalloy turbine disks. An unavoidable side-effect of powder metallurgy is the propensity to include non-metallic agglomerates in the nickel matrix. These inclusions may create a locally active stress field that may drive the nucleation of cracks. Recent studies have investigated different criteria for crack nucleation at room temperature. The real working conditions of a jet engine turbine are at high temperature and work remains to be done on crack nucleation in such an environment. This project aims to investigate the criteria for which cracks appear around an inclusion subject to high-temperature conditions by using experimental and modelling techniques.

粉末冶金已成为生产镍高温合金涡轮盘的首选方法。粉末冶金的一个不可避免的副作用是倾向于在镍基体中包含非金属团块。这些夹杂物可能产生局部活跃的应力场，从而驱动裂纹的成核。最近的研究对室温下裂纹成核的不同判据进行了研究。喷气发动机涡轮的实际工作条件是高温，在这种环境下裂纹形核的研究还有待深入。该项目旨在通过使用实验和建模技术来研究高温条件下夹杂物周围出现裂纹的标准。