文章信息/Info

Title:

Effect of Solution Temperature on Impact Toughness of TA31 Titanium Alloy Sheet and Underlying Mechanism

文章編號:

1674-3962(2025)06-0523-07

作者:

李瑞; 彭軒強; 關蕾; 李可爾; 龐蓮; 王鼎春; 陳威

1.寶雞鈦業股份有限公司，陜西 寶雞，721014； 2.西安交通大學材料科學與工程學院，陜西 西安 710049；

Author(s):

LI Rui; PENG Xuan-qiang; Guan Lei; LI Ke-er; PENG Lian;  WANG Ding-chun; CHEN Wei

1. Baoji Titanium Industry Co Ltd, Baoji 721014, China. 2. School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China；

關鍵詞:

TA31鈦合金; 沖擊功; 固溶溫度; 顯微組織; 裂紋擴展

Keywords:

TA31 titanium alloy;  impact properties;  solution temperature;  microstructure;  crack propagation

分類號:

TG146.23

DOI:

10.7502/j.issn.1674-3962.202503002

文獻標志碼:

A

摘要:

隨著人類對海洋探索的不斷深入，海水對潛艇的沖刷與侵蝕問題愈發顯著，這對長期服役于惡劣海洋環境中的鈦合金材料的抗沖擊性能提出了更為嚴苛的要求。研究了固溶溫度對TA31鈦合金板材的沖擊韌性的影響。結果表明，當固溶溫度（870 ℃）低于β轉變溫度時，合金的微觀組織主要由橢圓狀的初生α相和β轉變組織組成。隨著固溶溫度逐漸升高（970 ℃），初生α相的數量逐漸減少，而β轉變組織的比例則相應增多，并且在β轉變組織中觀察到少量片層狀α相析出。當固溶溫度(1020 ℃)進一步提升至高于β轉變溫度時，β基體上會形成大量的片層α相，這些片層α相交錯排列，構成典型的網籃組織。經870 ℃固溶1 h處理后的沖擊試樣（V型口）沖擊性能最好，沖擊吸收功可達到108.81 J，其中以裂紋擴展功為主。具體地，裂紋萌生功為18.97 J，裂紋擴展功為89.84 J。固溶溫度對TA31鈦合金微觀組織和沖擊功產生著顯著影響。具體而言，隨著固溶溫度的逐漸升高，TA31鈦合金的沖擊韌性呈現出明顯的下降趨勢。

Abstract:

With the deepening of human exploration of the ocean, the erosion and corrosion of submarines by seawater are becoming increasingly significant, which puts forward more stringent requirements for the impact resistance of titanium alloy materials long-tern serving in harsh marine environments. In this paper, the effect of solution temperature on the impact toughness of TA31 alloy sheet is studied. The results show that when the solution temperature (870 ℃) is lower than the β transition temperature, the microstructure of the alloy is mainly composed of ellipticity primary α phase and β-transition structure. With the increase of solution temperature (970 ℃), the number of primary α phase decreases gradually, while the proportion of β-transformed structure increases correspondingly, and a small amount of lamellar α phase is observed in the β-transformed structure. When the solution temperature (1020 ℃) is further increased to higher than the β transition temperature, a large number of lamellar α phases is formed on the β matrix. These lamellar α phases are interlaced and arranged, forming a typical basket-weave microstructure. After solution treatment at 870 ℃ for 1 h, the impact specimen (V-notch) has the best impact performance, and the impact absorption energy reaches 108.81 J, among which the crack propagation energy is the main part. Specifically, the work of crack initiation is 18.97 J, and the work of crack propagation is 89.84 J. The solution temperature has a significant effect on the microstructure and impact properties of TA31 alloy. Specifically, with the increase of solution temperature, the impact toughness of TA31 alloy shows a significant downward trend.