Prediction of threshold value for FGA formation

被引：80

作者：

Zhao, Aiguo ^{[1
]}

Xie, Jijia ^{[1
]}

Sun, Chengqi ^{[1
]}

Lei, Zhengqiang ^{[1
]}

Hong, Youshi ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 22-23期

基金：

中国国家自然科学基金;

关键词：

Very high cycle fatigue; FGA; Crack growth threshold; Frequency effect; Stress intensity factor; HIGH-CYCLE FATIGUE; SUBSURFACE CRACK INITIATION; PROPAGATION MECHANISM; ULTRASONIC FREQUENCY; FRACTURE SURFACE; LIFE REGIME; PART II; STRENGTH; GROWTH; STEEL;

D O I：

10.1016/j.msea.2011.05.070

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper studies the formation mechanism of fine granular area (FGA) in high-strength steels and predicts the threshold value of its formation. Fatigue experiments are carried out by using rotating bending and ultrasonic fatigue testing machines on a high carbon chromium steel (GCr15) with three different heat treatments. The results show that the range of stress intensity factor at the periphery of FGA (Delta K-FGA) keeps constant with an average value of 5.2 MPa m(1/2), which is close to the traditional crack growth threshold (Delta K-th,K-0), 5.0 MPa m(1/2). A theoretical model based on the plastic zone at crack tip is proposed to predict the value of Delta K-FGA and the predictions are in good agreement with experimental data. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：6872 / 6877

页数：6

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