Development of elevated temperature structural alloys & intermetallics

高温结构合金的开发

• 批准号: 155210-2011
• 负责人: Beddoes, Jonathan
• 金额: $ 1.53万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=476006
• 关键词: Development; elevated; temperature; structural; alloys

Several classes of alloys are designed for elevated temperature applications. This research focuses on two classes of these alloys: single crystal (SX) nickel base superalloys and titanium aluminide (TiAl) intermetallics. The former are virtually the only materials used for blades in the turbine stages of gas turbine engines. The latter are emerging as useful high temperature materials. The proposed SX research represents the third phase of a long term program. The first two phases examined microsegregation and the impact of refractory elements on the solidified structure, and developed innovative heat treatments to control chemical homogenization, solutioning and onset of incipient melting. The proposed third phase will study microstructural stability as a function of refractory content by determining the response to thermal and creep exposure in terms of elemental phase partitioning, gamma prime morphology, and formation of harmful topologically close packed phases. This research will provide an understanding of the metallurgical mechanisms controlling solution heat treatments and the influence on subsequent properties and, thereby, offer the opportunity to substantially shorten solution heat treatments and improve subsequent property control, reducing the processing cost of these alloys and improving properties during extended service in gas turbine engines. The research on TiAl will utilize the massive transformation possible in this material to develop a straightforward quench and temper process that produces a microstructure with properties appropriate for application as reciprocating engine exhaust valves. This research will investigate the influence of various process parameters to determine the kinetics of the massive transformation and tempering reactions, and finally characterize the hot strength, creep and fatigue properties. The research will provide a better fundamental understanding of the massive transformation in TiAl, as well as develop a simple cast plus easy-to-apply heat treatment process to reduce the manufacturing cost of TiAl valves helping them move from the laboratory to road vehicles.

几类合金设计用于升高温度应用。这项研究侧重于这些合金的两类：单晶（SX）镍碱基超合金和铝制钛合金（TIAL）的金属层。前者实际上是燃气轮机发动机涡轮机阶段中刀片的唯一材料。后者正在作为有用的高温材料出现。拟议的SX研究代表了长期计划的第三阶段。前两个阶段检查了微膜片以及难治元素对固化结构的影响，并开发了创新的热处理以控制化学均匀化，溶解和发作的初始融化。提出的第三阶段将通过确定对元素相分配，伽马素形态和形成有害的有害拓扑近距离封闭的堆积相的响应来研究微观结构稳定性作为难治含量的函数。这项研究将提供对控制溶液热处理的冶金机制的理解，以及对后续特性的影响，从而为实质上缩短溶液的热处理并改善了随后的物业控制，从而降低了这些合金的加工成本，并改善了这些合金的加工成本，并改善了这些合金的处理成本和改善。燃气轮机发动机的扩展服务。关于TIAL的研究将利用该材料中可能的大规模转化来开发直接的淬火和脾气过程，该淬火和脾气的过程产生具有适用于往复式发动机排气阀的属性的微观结构。这项研究将研究各种过程参数的影响，以确定大规模转化和回火反应的动力学，并最终表征热强度，蠕变和疲劳特性。这项研究将为TIAL的大规模转型提供更好的基本理解，并开发简单的铸造以及易于使用的热处理过程，以降低TIAL阀的制造成本，以帮助他们从实验室移动到公路车辆。