Development and evaluation of TiAl sheet structures for hypersonic applications
Development and evaluation of TiAl sheet structures for hypersonic applications
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DOI：
10.1016/j.msea.2007.02.020
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发表时间：
2007-08-25
期刊：
影响因子：
6.4
通讯作者：
Rissbacher, K.
中科院分区：
文献类型：
--
作者：
Draper, S. L.;Krause, D.;Rissbacher, K.
美国国家航空航天局(NASA)、奥地利航天局(ASA)、普惠公司、工程评估与设计公司和Plansee AG开展了一项合作项目，以确定通过使用TiAl实现高超声速推进系统结构大幅轻量化的可行性。一项行业研究确定，与基准镍基高温合金相比，TiAl技术在高超声速超燃冲压发动机进气、燃烧室和喷管部分的加劲结构中的减重潜力为25%-35%。设计了超燃冲压发动机进气罩襟翼，以及一个具有代表性的子元件，采用了TiAl独有的设计方法。制造了一个子元件并进行了测试，以评估可加工性和结构性能，并验证设计系统。所选用的TiAl合金是Plansee公司的第三代合金Gamma Met PX，(1)一种高温、高强度、高Nb含量的Gamma-TiAl合金。对Gamma Met PX片材进行了表征，包括拉伸、蠕变和疲劳测试。此外，还制作并测试了特定于设计的优惠券，以提高子元素测试预测。基于薄板表征和试件试验结果，准确地预测子单元的破坏位置和破坏载荷。(C)2007 Elsevier B.V.保留所有权利。
A cooperative program between the National Aeronautics and Space Administration (NASA), the Austrian Space Agency (ASA), Pratt & Whitney, Engineering Evaluation and Design, and Plansee AG was undertaken to determine the feasibility of achieving significant weight reduction of hypersonic propulsion system structures through the utilization of TiAl. A trade study defined the weight reduction potential of TiAl technologies as 25-35% compared to the baseline Ni-base superalloy for a stiffener structure in an inlet, combustor, and nozzle section of a hypersonic scramjet engine. A scramjet engine inlet cowl flap was designed, along with a representative subelement, using design practices unique to TiAl. A subelement was fabricated and tested to assess fabricability and structural performance and validate the design system. The TiAl alloy selected was PLANSEE's third generation alloy Gamma Met PX,(1) a high temperature, high-strength gamma-TiAl alloy with high Nb content. Characterization of Gamma Met PX sheet, including tensile, creep, and fatigue testing was performed. Additionally, design-specific coupons were fabricated and tested in order to improve subelement test predictions. Based on the sheet characterization and results of the coupon tests, the subelement failure location and failure load were accurately predicted. (c) 2007 Elsevier B.V. All rights reserved.