A comparative study of the fatigue behavior of two heat-treated nodular cast irons

被引：15
作者：
Konecna, R. [1 ]
Nicolette, G. [2 ]
Bubenko, L. [1 ]
Fintova, S. [1 ]
机构：
[1] Univ Zilina, Fac Mech Engn, Dept Mat Engn, Zilina 01026, Slovakia
[2] Univ Parma, Dept Ind Engn, I-43100 Parma, Italy
来源：
ENGINEERING FRACTURE MECHANICS | 2013年 / 108卷
关键词：
Heat treated ductile iron; Austempered ductile iron; Fatigue; Fatigue crack growth; Microstructure; Heterogeneity; DUCTILE; MICROSTRUCTURE; PARAMETERS;
D O I：
10.1016/j.engfracmech.2013.04.017
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The mechanical strength of nodular cast iron (NCI) can be improved by heat treatment. Isothermal Ductile Iron (IDI) competes with Austempered Ductile Iron (ADI) for applications subject to dynamic loading. The preliminary metallographic analysis of ADI and IDI showed similar graphite nodule characteristics but different metallic matrix structure. An extensive mechanical characterization of the two materials determined and compared (i) the high cycle fatigue strength, (ii) the fatigue crack growth rates and threshold Delta K-th, (iii) the typical crack propagation mechanisms, and (iv) the material heterogeneity in terms of local tensile tests. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：251 / 262
页数：12
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