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

被引：0

作者：

Xu-ming Lü ^{[1
]}

Shi-lei Li ^{[1
]}

Hai-long Zhang ^{[1
]}

Yan-li Wang ^{[1
]}

Xi-tao Wang ^{[1
,2
]}

机构：

[1] State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing

[2] Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing

来源：

InternationalJournalofMineralsMetallurgyandMaterials | 2015年 / 22卷 / 11期

关键词：

stainless steels; fatigue crack growth; thermal aging; embrittlement; fracture morphology;

D O I：

暂无

中图分类号：

TG142.71 [不锈钢、耐酸钢];

学科分类号：

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 unchanged 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.

引用

页码：1163 / 1170

页数：8

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