EFFECTS OF STRESS, TEMPERATURE AND HYDROGEN CONTENT ON HYDRIDE-INDUCED CRACK GROWTH IN ZR-2.5 PCT NB

被引：115

作者：

SIMPSON, LA

PULS, MP

机构：

[1] Atomic Energy of Canada Ltd., Pinawa, Manitoba

来源：

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1979年 / 10卷 / 08期

关键词：

D O I：

10.1007/BF02811655

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The velocity of hydride induced subcritical crack growth in Zr-2.5 pct Nb has been determined using the potential drop method for measuring crack extension. A revised picture of the two-stage, crack velocity-stress intensity relationship has been obtained with a threshold stress intensity of 6 MPa·m1/2, independent of temperature. A consistent temperature dependence of the crack velocity has been determined for hydrided material but the velocity measurements in as-received material are unexpectedly high. A previous theoretical model has been improved. The improved model has provided a useful basis for explaining some of the present data which could not be rationalized in terms of the previous model. Criteria for the stepwise crack propagation behavior are discussed. © 1979 American Society for Metals and the Metallurgical Society of AIME.

引用

页码：1093 / 1105

页数：13

共 24 条

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