STTR Phase I: Forming of Cast Titanium Structures by Transformation Superplasticity

STTR 第一阶段：通过相变超塑性形成铸造钛结构

• 批准号: 0420083
• 负责人: Edward Chen
• 金额: $ 10万
• 依托单位: TiTech International, Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0420083&HistoricalAwards=false
• 关键词: STTR; Phase; Forming; Cast; Titanium

This Small Business Technology Transfer (STTR) Phase I project examines the feasibility of using a casting transformation superplastic forming (TSP) hybrid process to produce affordable, high quality titanium parts, primarily for the aerospace industry. The project is aimed at preserving the advantages and reducing the cost and processing time, by exploring the attributes of investment casting and TSP. TSP is slow relative to conventional SPF, but investment casting can provide near net shape, greatly reducing the time required for TSP to achieve a final desired shape. Conversely, cast titanium microstructures are only amenable to superplastic forming by TSP. In this project, blanks will be cast and undergo TSP to selected final forms. Specimens will be inspected/tested for dimensional control, pre- and post-TSP microstructural characterization, and mechanical properties. The ability to produce complex titanium components by this approach could offer a significant cost savings allowing for even more widespread use of titanium.The broader impacts from this technology would be a new casting process. If successful, this technology could be used immediately to replace more expensive SPF for forged/machined structures, as well as allowing for more sophisticated and complex shapes. There would be a pay-off through weight reduction (thinner walls) as well as a reduction in bulk and weight for related support structures, increasing the thrust-to-weight ratio and overall fuel efficiency of aerospace systems.

这个小企业技术转让（STTR）第一阶段项目研究了使用铸造转变超塑成形（TSP）混合工艺生产经济实惠的高质量钛零件的可行性，主要用于航空航天工业。 本项目的目的是通过探索熔模铸造和TSP的属性，保持优势，降低成本和加工时间。 TSP相对于传统的SPF是缓慢的，但是熔模铸造可以提供近净形状，大大减少TSP实现最终期望形状所需的时间。 相反，铸造钛显微组织仅适用于TSP超塑性成形。 在这个项目中，将铸造毛坯，并进行TSP选择的最终形式。 将检查/测试样本的尺寸控制、TSP前后的微观结构表征和机械性能。 通过这种方法生产复杂钛部件的能力可以显著节省成本，从而使钛的使用更加广泛。这项技术的更广泛影响将是一种新的铸造工艺。如果成功，这项技术可以立即用于取代更昂贵的SPF锻造/机加工结构，以及允许更复杂和复杂的形状。 通过减轻重量（壁薄）以及减少相关支撑结构的体积和重量，增加航空航天系统的推重比和总体燃料效率，将获得回报。