新型铌合金研究-中国材料进展

文章信息/Info

Author(s):: Zheng Xin; Chen Shaokai; Cai Xiaomei; Bai Run; Xia Mingxing; Wang Feng; Liu Hui; Wang hui; Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China

摘要:: 高强铌合金具有比重小、强度高、韧性好、易焊接等优点，是高性能航空航天飞行器的高温部件，研究者采用大量碳化物强化、高温固溶淬火、大变形挤压、时效和热机械处理等方法研制出系列高强铌合金。航空航天高温结构件减重是一个重要方向，密度为6～7.2g/cm3的系列低密度铌合金，无涂层可在700℃以下工作，加涂层可在 1200℃以下工作。铌硅复合材料有望成为在1350℃以上工作的航空发动机叶片材料，研究者通过前期研究筛选出多元Nb-Si-Ti-Al-Cr-X合金作为满足高温应用要求的新合金的研究方向，揭示了铸态显微结构、热处理和热变形（热压、挤压、锻造）条件和机械性能，对Al、Mo、B等合金元素对抗氧化性能的影响进行了研究。

Abstract:: High-strength niobium alloys providing low-density , high strenght, very good ductilility at room temperature, and easy to jointing , have been used as the high temperature parts of space, aircraft which having high ability. In order to improve the high-temperature stenght and ductility at room temperature , the carbide strengthening , annealing and quenching at high temperature , high reduction of extrusion , aging , thermomechanical treatment have been used . In aerospace applications，weight savings have substantial benefit in system . A class of alloys with densities of 6.2～8g/cm3 which can be used uncoated in air to ～700℃, and which have sufficient oxidation resistance at 1200℃ that coating failure is noncatastrophic. Niobium silicidebased in situ composites are hopeful for potential applications in turbine engines with service temperatures up to 1350 degrees. After a preliminary investigation, the multi-component NbSiTiAlCrX system has been selected with the aim of developing new alloys that have the potential to meet the required properties for high temperature applications. This paper reports the development the microstructures of NbSiTiAlCrX alloy under ascast, heated and hot deformed （high temperature compression, extrusion, forging） conditions and the mechanical properties. The effect of aluminum, molybdenum, and boron on the oxidation behavior of the niobium-silicon-chromium alloy system has also been studied .