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      Potential of Metallurgical Gradients in the Design of Structural Components Made of Nodular Cast Iron

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          Abstract

          The objective of this work is to investigate the use of metallurgical gradients (MG) in the design of structural components made of ductile cast iron (DCI). MG have been realized in this study by locally varying the pearlite fraction of the matrix. Exemplarily, the allowable cyclic load for a drive shaft as well as the allowable static displacement are calculated. The performed calculations are based on static and cyclic strength data of four different DCI with amounts of pearlite ranging from 0% to 96.8%. To show the advantage of the purposeful usage of local MG, ten different configurations are examined by numerical simulation studies of a generic drive shaft comprising a circumferential notch. Four configurations are calculated assuming homogenous material throughout the entire component. In the other six configurations the surface region of the notch root has an increased amount of pearlite. For each configuration the allowable multiaxial cyclic load by combinations of torsion and bending was calculated and subsequently the allowable static bending displacement. The results show that the targeted realization of MG results in a significant increase in the multiaxial fatigue strength of the shaft as well as in a slight improvement of the allowable static bending displacement.

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          Damaging micromechanisms in ferritic–pearlitic ductile cast irons

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            General relation between tensile strength and fatigue strength of metallic materials

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              Microstructural strain distribution in ductile iron; comparison between finite element simulation and digital image correlation measurements

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                Author and article information

                Contributors
                Role: Academic Editor
                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                06 May 2021
                May 2021
                : 14
                : 9
                : 2411
                Affiliations
                [1 ]Institute for Materials Applications in Mechanical Engineering IWM—RWTH Aachen University, 52062 Aachen, Germany; c.broeckmann@ 123456iwm.rwth-aachen.de
                [2 ]Institute of Structural Mechanics and Lightweight Design SLA—RWTH Aachen University, 52062 Aachen, Germany; jannik.zimmermann@ 123456sla.rwth-aachen.de (J.Z.); kai-uwe.schroeder@ 123456sla.rwth-aachen.de (K.-U.S.)
                [3 ]Foundry Science and Foundry Institute GI, RWTH Aachen University, 52062 Aachen, Germany; b.pustal@ 123456gi.rwth-aachen.de (B.P.); office.buehrig-polaczek@ 123456gi.rwth-aachen.de (A.B.-P.)
                Author notes
                [* ]Correspondence: c.ripplinger@ 123456iwm.rwth-aachen.de (C.R.); markus.gastens@ 123456sla.rwth-aachen.de (M.G.); Tel.: +49-241-80-99535 (C.R.); +49-241-80-96837 (M.G.)
                [†]

                The second author made a contribution equivalent to that of the first author in the conduct of the work and preparation of the article.

                Author information
                https://orcid.org/0000-0003-1962-9071
                https://orcid.org/0000-0002-0790-8148
                https://orcid.org/0000-0002-3171-962X
                Article
                materials-14-02411
                10.3390/ma14092411
                8124685
                3043be7e-0194-4292-8e1e-99d5e3322cb4
                © 2021 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( https://creativecommons.org/licenses/by/4.0/).

                History
                : 08 April 2021
                : 30 April 2021
                Categories
                Article

                ductile cast iron,component design,metallurgic gradients,fatigue strength

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