Hydride-Phase Formation and its Influence on Fatigue Crack Propagation Behavior in a Zircaloy-4 Alloy

被引：10

作者：

Garlea, Elena ^{[1
]}

Choo, Hahn ^{[1
,2
]}

Wang, Gongyao Y. ^{[1
]}

Liaw, Peter K. ^{[1
]}

Clausen, Bjorn ^{[3
]}

Brown, Donald W.

Park, Jungwon ^{[1
]}

Rack, Philip D. ^{[1
]}

Kenik, Edward A. ^{[4
]}

机构：

[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA

[3] Los Alamos Natl Lab, LANSCE LC, Los Alamos, NM 87545 USA

[4] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2010年 / 41A卷 / 11期

基金：

美国国家科学基金会;

关键词：

LOW-CYCLE FATIGUE; GROWTH BEHAVIOR; FRACTURE-TOUGHNESS; HYDROGEN CONTENT; TEMPERATURE; STRESS; STRAIN; BETA; TIP; TRANSFORMATION;

D O I：

10.1007/s11661-010-0342-z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The hydride-phase formation and its influence on the fatigue behavior of a Zircaloy-4 alloy charged with hydrogen gas are investigated. First, the microstructure and fatigue crack propagation rate of the alloy in the as-received condition are studied. Second, the formation and homogeneous distribution of the delta zirconium hydride in the bulk and its effect on the fatigue crack propagation rate are presented. The results show that in the presence of hydrides, the zirconium alloy exhibits reduced toughness and enhanced crack growth rates. Finally, the influence of a preexisting fatigue crack in the specimen and the subsequent hydride formation are examined. The residual lattice strain profile around the fatigue crack tip is measured using neutron diffraction. It is observed that the combined effects of residual strains and hydride precipitation on the fatigue behavior are more severe leading to propagation of the crack under near threshold loading.

引用

页码：2816 / 2828

页数：13

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