Microstructure influence on fatigue behaviour of nodular cast iron

Čanžar, Predrag and Tonković, Zdenko and Kodvanj, Janoš (2012) Microstructure influence on fatigue behaviour of nodular cast iron. = Microstructure influence on fatigue behaviour of nodular cast iron. Materials Science and Engineering A, 556. pp. 88-99. ISSN 0921-5093. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q1 (2012). .

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Abstract

The present paper evaluates the fatigue life of ductile nodular cast iron EN-GJS-400-18LT with four different microstructures. Characterisation of the graphite morphology and the matrix microstructure is performed on 50 samples for every material type. Tensile stress-strain curves, symmetrical and unsymmetrical stress-strain hysteresis loops, cyclic stress-strain curves, crack resistance curves and fatigue life curves of these four microstructures are obtained. Experimental results show that size, shape and distribution of the graphite nodules has no significant influence on cyclic hardening of the material but they play a great role in the crack initiation and propagation process. It is shown that the larger irregularly shaped nodules reduce fracture toughness and fatigue strength. Furthermore, the results demonstrated that pearlitic phase does not strongly affect fatigue life if its proportion does not exceed 10. The monitoring of crack length during the tests is performed by an optical method developed in the present work. © 2012 Elsevier B.V.

Item Type: Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian): Crack initiation and propagation; Crack length; Crack resistance; Cyclic hardening; Cyclic stress strain curves; Cyclic tests; Fatigue behaviour; Fatigue life curve; Fatigue strength; Graphite morphology; Graphite nodules; Matrix microstructure; Optical methods; Stress-strain hysteresis loops; Tensile stress-strain curves; Crack propagation; Cracks; Experiments; Fatigue of materials; Graphite; Microstructure; Stress-strain curves; Nodular iron
Subjects: TECHNICAL SCIENCE
Divisions: 200 Department of Engineering Mechanics > 210 Chair of Mechanics and Strength of Materials
200 Department of Engineering Mechanics > 220 Chair of Experimental Mechanics
Indexed in Web of Science: Yes
Indexed in Current Contents: Yes
Quartiles: Q1 (2012)
Date Deposited: 30 Apr 2015 08:27
Last Modified: 26 Feb 2016 11:39
URI: http://repozitorij.fsb.hr/id/eprint/3912

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