Achieving superior fatigue strength in a powder-metallurgy titanium alloy via in-situ globularization during hot isostatic pressing

被引：26

作者：

Guo, R. P.

Cheng, M.

Zhang, C. J. ^{[1
]}

Qiao, J. W. ^{[1
]}

Cai, C. ^{[2
]}

Wang, Q. J. ^{[3
]}

Xu, D. S. ^{[3
]}

Xu, L. ^{[3
]}

Yang, R. ^{[3
]}

Shi, Y. S. ^{[2
]}

Liaw, P. K. ^{[4
]}

机构：

[1] Taiyuan Univ Technol, Coll Mat Sci & Engn, Taiyuan 030024, Peoples R China

[2] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China

[3] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

[4] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

来源：

SCRIPTA MATERIALIA | 2023年 / 228卷

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

Titanium alloys; Hot isostatic pressing; Globularization; Fatigue strength; Fatigue-crack initiation; HIGH-CYCLE FATIGUE; ADDITIVELY MANUFACTURED TI-6AL-4V; NEAR-ALPHA TITANIUM; MECHANICAL-PROPERTIES; CRACK-GROWTH; TENSILE PROPERTIES; INDUCED POROSITY; HEAT-TREATMENT; MICROSTRUCTURE; BEHAVIOR;

D O I：

10.1016/j.scriptamat.2023.115345

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Powder-metallurgy (PM) titanium alloys exhibit outstanding quasistatic-mechanical properties, but suffer from low fatigue performance, which severely limits their applications in aerospace. Here, we achieve a superior fatigue strength of 600 MPa in a near-alpha PM titanium alloy, using a two-step hot-isostatic-pressing scheme, during which more than 80 vol.% (volume fraction) randomly orientated equiaxed grains was obtained. The largely improved fatigue strength (similar to 25%) is mainly attributed to the in-situ globularization of the lamella-like microstructure, leading to higher crack nucleation resistance and lower growth rates of short cracks. The present findings offer a useful route for fabricating PM titanium alloys with high fatigue strengths.

引用

页数：6

共 65 条

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