文章信息/Info

Title:

New Type Niobium Alloys

作者:

鄭 欣;  白 潤;  蔡曉梅;  夏明星;  王 鋒;  劉 輝;  王 輝;  喻吉良

 西北有色金屬研究院，陜西 西安 710016

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

關鍵詞:

高強鈮合金; 低密度鈮合金; 鈮硅復合材料; 高溫強度

DOI:

10.7502/j.issn.1674-3962.2014.09.07

文獻標志碼:

A

摘要:

高強鈮合金具有比重小、強度高、韌性好、易焊接等優(yōu)點，是高性能航空航天飛行器的高溫部件，研究者采用大量碳化物強化、高溫固溶淬火、大變形擠壓、時效和熱機械處理等方法研制出系列高強鈮合金。航空航天高溫結(jié)構件減重是一個重要方向，密度為6～7.2g/cm3的系列低密度鈮合金，無涂層可在700℃以下工作，加涂層可在1200℃以下工作。鈮硅復合材料有望成為在1350℃以上工作的航空發(fā)動機葉片材料，研究者通過前期研究篩選出多元Nb-Si-Ti-Al-Cr-X合金作為滿足高溫應用要求的新合金的研究方向，揭示了鑄態(tài)顯微結(jié)構、熱處理和熱變形（熱壓、擠壓、鍛造）條件和機械性能，對Al、Mo、B等合金元素對抗氧化性能的影響進行了研究。

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 .