Influence of microstructure and stress ratio on fatigue crack propagation in TiAl alloy

被引：1
|
作者：
Zuo, Yanrui [1 ]
Rui, Zhiyuan [1 ]
Feng, Ruicheng [1 ]
Luo, Dechun [1 ]
Yan, Changfeng [1 ]
机构：
[1] Lanzhou Univ Technol, Minist Educ, Key Lab Digital Mfg Technol & Applicat, Lanzhou 730050, Peoples R China
来源：
CHEMICAL, MATERIAL AND METALLURGICAL ENGINEERING III, PTS 1-3 | 2014年 / 881-883卷
关键词：
fatigue crack propagation; TiAl alloy; microstructure; stress ratio; GROWTH;
D O I：
10.4028/www.scientific.net/AMR.881-883.1330
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Based on the fatigue crack propagation experiments did by A.-L. Gloanec et al., the fatigue crack propagation rates of TiAl alloy of two processing routes, namely casting and PM, and stress ratios had been tested, in order to find out the effects of microstructure and stress ratio. An improved fatigue crack propagation formula for region II (the expansion region) was derived according to Paris formula. The specific values of the constants in the formula were calculated. Fatigue crack propagation resistance of nearly fully lamellar microstructure is superior to that of equiaxed gamma grain. The experimental results present that both microstructure and stress ratio has a significant influence on fatigue crack growth rate.
引用
收藏
页码：1330 / 1333
页数：4
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