Effects of cold work on material properties for high temperature fastener materials

冷加工对高温紧固件材料性能的影响

• 批准号: 1807925
• 金额: --
• 依托单位: University of Birmingham
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1807925
• 关键词: Effects; cold; work; material; properties

This project will involve extensive material property evaluation including creep, stress relaxation, slow strain rate tensile tests, oxidation, total fatigue life, fatigue crack growth resistance and notched stress rupture tests. Advanced material characterisation techniques will include EBSD and analytical TEM and SEM. Overall the programme will contribute to defining an operating envelope for the cold worked material and to rationalise the choice of cold-worked or non-cold worked material for specific applications. Areas to be explored for cold worked material are expected to include a consideration of phase stability, environmental susceptibility, crack initiation life, notch- brittleness, crack growth rates and stress relaxation rates- all at elevated temperatures. Results will be correlated with underlying microstructural features to be characterised in detail throughout the programme. The behaviour of cold- worked materials at high temperatures is not well understood and the project will contribute to fundamental understanding of this topic, together with some specific attention to issues focused on their use as fasteners.

该项目将涉及广泛的材料性能评估，包括蠕变，应力松弛，慢应变速率拉伸试验，氧化，总疲劳寿命，疲劳裂纹扩展阻力和缺口应力断裂试验。先进的材料表征技术将包括EBSD和分析TEM和SEM。总体而言，该计划将有助于确定冷加工材料的工作范围，并合理选择冷加工或非冷加工材料用于特定应用。冷加工材料的研究领域预计包括相稳定性、环境敏感性、裂纹萌生寿命、缺口脆性、裂纹扩展速率和应力松弛速率--所有这些都在高温下进行。结果将与整个计划中详细描述的潜在微观结构特征相关联。冷加工材料在高温下的行为还没有得到很好的理解，该项目将有助于对这一主题的基本理解，并特别注意将其用作紧固件的问题。