一种<span>TiAl合金的高温蠕变和疲劳行为及其寿命预测方法</span>

2013 , Vol. 49 >Issue 11: 1311 - 1317

DOI: https://doi.org/10.3724/SP.J.1037.2013.00434

论文

一种TiAl合金的高温蠕变和疲劳行为及其寿命预测方法

于慧臣 ,
董成利 ,
焦泽辉 ,
孔凡涛 ,
陈玉勇 ,
苏勇君

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1) 北京航空材料研究院航空材料检测与评价北京市重点实验室,先进高温结构材料国防科技重点实验室, 北京 100095
2) 哈尔滨工业大学金属精密热加工国防科技重点实验室, 哈尔滨 150001

于慧臣, 男, 1964年生, 博士, 研究员

收稿日期: 2013-07-23

修回日期: 2013-08-31

网络出版日期: 2013-11-11

基金资助

国家重点基础研究发展计划项目2011CB605506及国家自然科学基金项目51074058资助

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

YU Huichen ,
DONG Chengli ,
JIAO Zehui ,
KONG Fantao ,
CHEN Yuyong ,
SU Yongjun

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1) Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095
2) National Key Laboratory of Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001

Received date: 2013-07-23

Revised date: 2013-08-31

Online published: 2013-11-11

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摘要

针对双态(duplex, DP)和全片层(fully lamellar, FL)不同组织形态的Ti－43Al－9V－Y金属间化合物合金,开展了高温蠕变(700℃)和高温低周疲劳(700和750℃)实验,研究其高温蠕变、疲劳变形行为和寿命预测方法.首先采用Omega法对2种组织形态TiAl合金的蠕变变形行为进行了数值模拟,并对其持久寿命进行了预测, 然后在Walker应变的基础上提出了新的寿命模型,对2种组织形态TiAl合金的疲劳寿命进行了预测. 研究结果表明:(1) 2种组织形态TiAl合金的高温蠕变实验曲线仅包含稳态和加速蠕变阶段, 而不包含初始蠕变阶段,且Omega法能够对2种组织形态TiAl合金的高温蠕变变形行为进行准确地表征;(2) 相同温度和应力水平下, FL组织形态TiAl合金的持久寿命比DP组织形态TiAl合金的长,且Omega法预测的持久寿命与相应的实验寿命吻合得很好;(3) 在相同温度和载荷条件下,DP组织形态TiAl合金的疲劳寿命比FL组织形态TiAl合金的长,且采用新提出的寿命模型能够对2种不同组织形态TiAl合金的疲劳寿命进行预测,预测的寿命全部位于实验寿命的±3倍分散带以内.

关键词： 双态; 全片层; 蠕变; 低周疲劳; 寿命预测

本文引用格式

于慧臣 , 董成利 , 焦泽辉 , 孔凡涛 , 陈玉勇 , 苏勇君 . 一种TiAl合金的高温蠕变和疲劳行为及其寿命预测方法[J]. 金属学报, 2013 , 49(11) : 1311 -1317 . DOI: 10.3724/SP.J.1037.2013.00434

Abstract

Creep (at 700℃) and low cycle fatigue (at 700 and 750℃) 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.

Key words： Duplex; fully lamellar; creep, low cycle fatigue; life prediction

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