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Metals 2015, 5(4), 2351-2369; doi:10.3390/met5042351

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

1
Arts et Métiers ParisTech, Centre de Lille, 8, Boulevard Louis XIV, 59000 Lille Cedex, France
2
Laboratoire des Matériaux Céramiques et Procédés Associés, Université de Valenciennes et du Hainaut Cambrésis, Bd Charles de Gaulle, 59600 Maubeuge, France
3
Laboratoire de Cristallographie et Sciences des Matériaux, Normandie Université, CNRS UMR 6508, 6 Bd Maréchal Juin, 14050 Caen, France
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 9 November 2015 / Revised: 30 November 2015 / Accepted: 4 December 2015 / Published: 10 December 2015
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Abstract

Tensile and compression tests were carried out on a ductile cast iron for temperatures up to 1073 K. The damage caused inside and around graphite nodules was evaluated as a function of the local equivalent plastic strain by using microstructural quantifications. The mechanical properties are strongly dependent on a temperature above 773 K. Concerning tensile behavior, an evolutional law issued from the Gurson model representing the void growth as a function of the deformation and temperature was successfully employed. It is demonstrated that the strain state and the temperature have a strong influence on the void growth function. In the case of compression tests, the temperature has a weak influence on the nodule deformation for temperatures lower than 773 K, and the mechanical behavior is driven by the viscoplastic properties of the ferrite. For higher temperatures, the mechanical properties in compression are progressively modified, since graphite nodules tend to remain spherical, and ferrite grains are severely deformed. A synthesis of the damage mechanisms is proposed in the studied range of temperature and plastic strain. It appears that the graphite nodule aspect ratio can be used as an indicator of the deformation under compression loading for temperatures ranging from room temperature to 673 K. View Full-Text
Keywords: ductile cast iron; void damage mechanisms; temperature effects; ductile fracture; mechanical properties ductile cast iron; void damage mechanisms; temperature effects; ductile fracture; mechanical properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hervas, I.; Thuault, A.; Hug, E. Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature. Metals 2015, 5, 2351-2369.

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