50-FOLD DIFFERENCE IN REGION-II FATIGUE CRACK-PROPAGATION RESISTANCE OF TITANIUM-ALLOYS - GRAIN-SIZE EFFECT

被引：29

作者：

YODER, GR

COOLEY, LA

CROOKER, TW

机构：

[1] Material Science and Technology Division, Naval Research Laboratory, Washington, DC

来源：

JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME | 1979年 / 101卷 / 01期

关键词：

D O I：

10.1115/1.3443656

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Fatigue crack growth rates (da/dN) in ambient laboratory air have been determined for a wide variety of materials from four basic α + β titanium alloy systems. Each material was cyclically loaded with a haversine waveform and a load ratio, R = 0.10. The results indicate that, at a constant value of stress-intensity range (ΔK), the width of the da/dN data band exceeds an order of magnitude. For example, at ΔK = 21 MPa · m1/2, a 50-fold difference in fatigue crack propagation rates is observed. Analysis of the crack growth rate data at this point indicates a systematic dependence on grain size (l), viz. that da/dN decreases with increasing l. An interpretation of this effect is offered in terms of reversed (cyclic) plastic zone size considerations. © 1979 by ASME.

引用

页码：86 / 90

页数：5

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