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(yuǎn)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(yè)第一飛機(jī)設(shè)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‘a(chǎn)n 710089, China)

關(guān)鍵詞:

超高強(qiáng)中韌鈦合金; 成分設(shè)計; 鍛造; 組織; 力學(xué)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(xiàn)標(biāo)志碼:

A

摘要:

針對目前高強(qiáng)韌鈦合金發(fā)展的瓶頸，從分類應(yīng)用角度考慮，在現(xiàn)有高強(qiáng)韌鈦合金的基礎(chǔ)上，通過Mo當(dāng)量選擇合金元素的種類和權(quán)重，結(jié)合組織結(jié)構(gòu)設(shè)計，設(shè)計了一種新型超高強(qiáng)中韌亞穩(wěn)β鈦合金。經(jīng)過實驗室和中試規(guī)格鑄錠的加工和測試，在優(yōu)化的鍛造和熱處理工藝下，該合金可以穩(wěn)定達(dá)到兩種強(qiáng)度級別，一種是抗拉強(qiáng)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(qiáng)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(xiàn)有高強(qiáng)韌鈦合金，這兩種強(qiáng)度級別鈦合金均顯示出明顯的性能優(yōu)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.