含氢NZ2锆合金疲劳裂纹扩展行为  

Fatigue Crack Propagation Behavior of NZ2 Zirconium Alloy with Different Hydrogen Contents

作　　者：周军[1,2] 李中奎[2] 张建军[2] 朱梅生[2] 王文生[2] 田锋[2] 石明华[2] 周廉[1,2] 

机构地区：[1]西北工业大学,陕西西安710072 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2009年第10期1797-1800,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(50571083)

摘　　要：利用板材标准M(T)试样研究了4种不同氢含量(0,200,450,730μg/g)NZ2锆合金的疲劳裂纹扩展行为。发现不论含氢量的高低,裂纹稳态扩展区的裂纹扩展行为均符合Paris幂律关系,即da/dN=C(△K)n,但随着氢含量的增加,n值不断减小;含氢量增加导致NZ2合金塑性变形能力降低,疲劳裂纹扩展速率增加,尤其是氢含量较高时表现更为明显。Fatigue crack propagation behavior of an advanced Zr-Sn-Nb alloy NZ2 with different hydrogen contents （0, 200, 450, and 730 μg/g） was investigated by standard M（T） specimens. The results showed that stable crack propagation behavior obeyed the Paris Law, i.e. da/dN=C（ΔK）^n, whether the hydrogen content is high or low. But the power exponent n of the Paris Law was decreased with the hydrogen content increasing; the increment of hydrogen content can decrease the ductility of NZ2 alloy and enhance the fatigue crack growth rate, especially when the specimens have higher hydrogen content.

关 键 词：NZ2锆合金 疲劳裂纹扩展 氢化物 

分 类 号：TG146.414[一般工业技术—材料科学与工程]