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Open AccessArticle

Validation of a New Quality Assessment Procedure for Ductile Irons Production Based on Strain Hardening Analysis

1
Department of Chemical Sciences and Materials Technology, Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE), National Research Council of Italy, via R. Cozzi 53, 20125 Milano, Italy
2
Zanardi Fonderie S.p.A., via Nazionale 3, 37046 Minerbe (VR), Italy
*
Author to whom correspondence should be addressed.
Metals 2019, 9(8), 837; https://doi.org/10.3390/met9080837
Received: 19 June 2019 / Revised: 22 July 2019 / Accepted: 24 July 2019 / Published: 27 July 2019
(This article belongs to the Special Issue Failure Mechanisms in Alloys)
A mathematical procedure based on the analysis of tensile flow curves has been proposed to assess the microstructure quality of several ductile irons (DIs). The procedure consists of a first diagram for the assessment of the ideal microstructure of DIs, that is, the matrix where mobile dislocations move, and a second diagram for the assessment of the casting integrity because of potential metallurgical discontinuities and defects in DIs. Both diagrams are based on the dislocation-density-related constitutive Voce equation that is used for modeling the tensile plastic behavior of DIs. The procedure stands on the fundamental assumption that the strain hardening behavior of DIs is not affected by the nature and the density of the potential metallurgical discontinuities and defects, which are expected to affect only the elongations to fracture. However, this fundamental assumption is not obvious, and so its validity was evaluated through tensile testing Isothermed Ductile Irons (IDIs) 800, showing a wide scatter of elongations to rupture. The analysis of the strain hardening behaviors supported by strain energy density calculations of IDIs tensile tests proved that the fundamental assumption was valid and the quality assessment procedure could be applied to IDIs. A modified Voce equation was also introduced to improve the fitting of the experimental tensile flow curves and the strain energy density calculations. View Full-Text
Keywords: ductile irons; tensile tests; mechanical properties; constitutive equations; quality assessment ductile irons; tensile tests; mechanical properties; constitutive equations; quality assessment
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Angella, G.; Zanardi, F. Validation of a New Quality Assessment Procedure for Ductile Irons Production Based on Strain Hardening Analysis. Metals 2019, 9, 837.

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