Effect of thermal aging on the fatigue crack growth behavior of cast duplex stainless steels

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外文摘要：The effect of thermal aging on the fatigue crack growth (FCG) behavior of Z3CN20-09M cast duplex stainless steel with low ferrite content was investigated in this study.The crack surfaces and crack growth paths were analyzed to clarify the FCG mechanisms.The microstructure and micromechanical properties before and after thermal aging were also studied.Spinodal decomposition in the aged ferrite phase led to an increase in the hardness and a decrease in the plastic deformation capacity, whereas the hardness and plastic deformation capacity of the austenite phase were almost tmchanged after thermal aging.The aged material exhibited a better FCG resistance than the unaged material in the near-threshold regime because of the increased roughness-induced crack closure associated with the tortuous crack path and rougher fracture surface;however, the tendency was reversed in the Paris regime because of the cleavage fracture in the aged ferrite phases.

外文关键词：

stainless steelsfatigue crack growththermal agingembrittlementfracture morphology

作者：

Xu-ming Lü、Shi-lei Li、Hai-long Zhang、Yan-li Wang、Xi-tao Wang

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作者单位：

State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China

基金：

National High-Tech Research and Development Program of ChinaNational High-Tech Research and Development Program of China

项目编号：

2012AA03A5072012AA050901

出版年：

2015

DOI：

10.1007/s12613-015-1181-0

矿物冶金与材料学报

北京科技大学

矿物冶金与材料学报

CSCDSCIEI

影响因子：0.609

ISSN：1674-4799

年,卷(期)：2015.22(11)

被引量2
参考文献量28