HIGH TEMPERATURE CREEP AND FATIGUE BEHAVIOR AND LIFE PREDICTION METHOD OF A TiAl ALLOY

被引：5

作者：

Yu Huichen ^{[1
]}

Dong Chengli ^{[1
]}

Jiao Zehui ^{[1
]}

Kong Fantao ^{[2
]}

Chen Yuyong ^{[2
]}

Su Yongjun ^{[2
]}

机构：

[1] Beijing Inst Aeronaut Mat, Beijing Key Lab Aeronaut Mat Testing & Evaluat, Sci & Technol Adv High Temp Struct Mat Lab, Beijing 100095, Peoples R China

[2] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China

来源：

ACTA METALLURGICA SINICA | 2013年 / 49卷 / 11期

基金：

中国国家自然科学基金;

关键词：

duplex; fully lamellar; creep; low cycle fatigue; life prediction; PLASTIC STRAIN-ENERGY; OMEGA-METHOD; MICROSTRUCTURE; DEFORMATION; TOUGHNESS; PHASE; NB;

D O I：

10.3724/SP.J.1037.2013.00434

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Creep (at 700 degrees C) and low cycle fatigue (at 700 and 750 degrees C) tests of Ti-43Al-9V-Y alloy with duplex (DP) and fully lamellar (FL) microstructures are carried out to study the creep, fatigue deformation and life prediction. Firstly, Omega method is employed to characterize the creep deformation and to predict the rupture life. Secondly, the proposed fatigue life model based on walker strain is employed to predict the fatigue life for these two types of TiAl alloy. The results show that: (1) high temperature creep curves of the material of both DP and FL microstructure contain steady and accelerated creep stages other than initial creep stage, and Omega method is able to characterize the creep deformation of TiAl alloy with DP and FL microstructure; (2) the rupture time of the material of FL microstructure is longer than that of DP microstructure, and the predicted rupture time by Omega method agrees well with the test data; (3) the fatigue life of DP is longer than that of FL under the same test condition, and the predicted fatigue life is well located in the scatter band of 3 of the test fatigue life.

引用

页码：1311 / 1317

页数：7

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