文章信息/Info

Title:

A New Type Extra-High Strength and Medium Toughness Titanium Alloy of Ti-1500

文章編號:

1674-3962(2021)06-0441-05

作者:

辛社偉1; 周偉1; 李倩1; 張思遠1; 楊健2; 趙永慶1; 毛小南1; 王雪元2

（1.西北有色金屬研究院，陜西 西安 710016）（2.航空工業第一飛機設計研究院，陜西 西安 710089）

Author(s):

XIN Shewei1;  ZHOU Wei1;  LI Qian1;  ZHANG Siyuan1;  YANG Jian2;  ZHAO Yongqing1;  MAO Xiaonan1;  WANG Xueyuan2

(1.Northwest Institute for Non-ferrous Metal Research, Xi’an 710016, China) (2.AVIC the First Aircraft Institute, Xi‘an 710089, China)

關鍵詞:

超高強中韌鈦合金; 成分設計; 鍛造; 組織; 力學性能

Keywords:

extra-high strength and medium toughness titanium alloy;  composition design;  forge;  microstructure;  mechanical properties

分類號:

TG146.23

DOI:

10.7502/j.issn.1674-3962.202005029

文獻標志碼:

A

摘要:

針對目前高強韌鈦合金發展的瓶頸，從分類應用角度考慮，在現有高強韌鈦合金的基礎上，通過Mo當量選擇合金元素的種類和權重，結合組織結構設計，設計了一種新型超高強中韌亞穩β鈦合金。經過實驗室和中試規格鑄錠的加工和測試，在優化的鍛造和熱處理工藝下，該合金可以穩定達到兩種強度級別，一種是抗拉強度大于1500 MPa、延伸率大于5%、斷裂韌性大于45 MPa·m1/2；另一種是抗拉強度大于1300 MPa、延伸率大于6%、斷裂韌性大于60 MPa·m1/2。相比于現有高強韌鈦合金，這兩種強度級別鈦合金均顯示出明顯的性能優勢。

Abstract:

Aiming at the development bottleneck of high strength and high toughness titanium alloy, from the perspective of classification applications, and based on existing research of extra-high strength and high toughness titanium alloy. A new type of metastable β titanium alloy was designed by selecting the types and weights of alloying elements by Mo equivalent, combined with the design of the structure. After processing and testing of ingots of laboratory and pilot scale specifications, under optimized forging and heat treatment processes, the alloy can stably reach two strength levels. One is that the strength is greater than 1500 MPa, the elongation is greater than 5%, and the fracture toughness is greater than 45 MPa·m1/2; the other is that the strength is greater than 1300 MPa, the elongation is greater than 6%, and the fracture toughness is greater than 60 MPa·m1/2. In comparison with the existing high strength and high toughness titanium alloys, it is evident superiority of the new alloy for any performance levels.