Influence of Temperature on Fatigue Crack Propagation in TiAl Alloys*

被引：6
|
作者：
Feng, R. C. [1 ,2 ]
Rui, Z. Y. [1 ,2 ]
Zuo, Y. [1 ]
Yan, C. F. [1 ,2 ]
Zhang, G. T. [1 ,2 ]
机构：
[1] Lanzhou Univ Technol, Minist Educ, Key Lab Digital Mfg Technol & Applicat, Lanzhou, Peoples R China
[2] Lanzhou Univ Technol, Sch Mech & Elect Engn, Lanzhou, Peoples R China
来源：
STRENGTH OF MATERIALS | 2014年 / 46卷 / 03期
关键词：
fatigue crack growth; TiAl alloy; temperature; FRACTURE; DEFORMATION; BEHAVIOR; GROWTH;
D O I：
10.1007/s11223-014-9563-5
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Experimental investigations of fracture toughness for a TiAl-based gamma-alloy were performed at different temperatures. The temperature effect on fatigue crack growth behavior is evaluated, the formula describing its rate in range to II (stable propagation) was derived, as well as specific values of equation constants were obtained on the basis of experimental results. Tests were conducted in vacuum at 25, 750, and 850A degrees C. The experimental results demonstrate that temperature exerts great influence on fatigue crack growth rates. With an increase in temperature up to 750A degrees C, the growth rate of such cracks increases, after reaching this temperature, the brittle-ductile transition of a TiAl-based alloy is taking place. A similar relationship is also observed for conventional alloys.
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页码：417 / 421
页数：5
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