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Strength prediction of lamellar graphite iron: From Griffith’s to hall-petch modified equation
Swerea SWECAST AB, Jönköping, Sweden.
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-3024-9005
2018 (English)In: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 925, p. 272-279Article in journal (Refereed) Published
Abstract [en]

Traditionally, ultimate tensile strength (UTS) is used as the main property for the characterization of lamellar graphite iron (LGI) alloys under static loads. The main models found in the literature for predicting UTS of pearlitic lamellar graphite iron are based on either regression analysis on experimental data or on modified Griffith or Hall-Petch equation. In pearlitic lamellar graphite iron the primary austenite dendritic network, transformed to pearlite, reinforces the bulk material while the distance between those pearlite grains, defines the maximum continuous defect size in the bulk material. Recently the novel parameter of the Diameter of Interdendritic Space has been used to express the flow length in a modified Griffith equation for the prediction of the UTS in LGI. Nevertheless this model neglects the strengthening effect of the pearlite lamellar spacing within the perlite grains. A model based on modified Hall-Petch equation was developed in this work. The model considers the effect of both microstructure parameters and covers a broad spectrum of microstructure sizes typical for complex shape castings with various wall thicknesses. 

Place, publisher, year, edition, pages
Trans Tech Publications, 2018. Vol. 925, p. 272-279
Keywords [en]
Lamellar graphite iron, Pearlite spacing, Primary austenite, Tensile strength, Austenite, Forecasting, Graphite, Materials handling equipment, Microstructure, Pearlite, Regression analysis, Graphite iron, Interdendritic space, Micro-structure parameters, Strength prediction, Strengthening effect, Ultimate tensile strength, Cast iron
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-41295DOI: 10.4028/www.scientific.net/MSF.925.272ISI: XYZScopus ID: 2-s2.0-85050010996ISBN: 9783035710557 (print)OAI: oai:DiVA.org:hj-41295DiVA, id: diva2:1242795
Conference
11th International Symposium on the Science and Processing of Cast Iron, SPCI-XI 2017, Jönköping, Sweden, 4-7 September 2017
Available from: 2018-08-29 Created: 2018-08-29 Last updated: 2020-05-04Bibliographically approved
In thesis
1. Dendritic morphology and ultimate tensile strength of pearlitic lamellar graphite iron
Open this publication in new window or tab >>Dendritic morphology and ultimate tensile strength of pearlitic lamellar graphite iron
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The continued development, of cylinder blocks and cylinder heads for heavy truck engines that are made of lamellar graphite iron (LGI) is focused on achieving high ultimate tensile strength (UTS) whilst conforming to environmental regulations. The purpose of this work is to further improve the tensile strength as well as the predictive engineering tools for optimization of LGI aimed to enhance the efforts for producing lighter and sustainable components without sacrificing performance.

Varying the carbon content and solidification rate greatly influences the amount and the coarseness of the microstructure phases resulting in large variations of material properties. The experimental data set provided in this work covers a comprehensive range of microstructure and the UTS values aimed to be used in a holistic model for UTS prediction.

In pearlitic LGI the primary austenite dendritic network reinforces the material while the distance between the pearlite grains defines the maximum continuous defect size. The novel parameter of Hydraulic Diameter of the Inter-dendritic Phase (DIPHyd) has been introduced in this work to express the amount and the coarseness of the space between the pearlite grains that have been solidified as primary austenite dendrites. The DIPHyd has proven to be the generic parameter that defines the maximum continuous defect size in the material, and hence it has been applied in modified Griffith and Hall-Petch models for prediction of UTS.

Microstructure models have been developed for prediction of the key microstructure parameters that define the strength of LGI. These models have been combined with the modified Griffith and Hall-Petch equations and incorporated into casting simulation software to enable the strength prediction for pearlitic LGI alloys with various carbon contents. The results show that the developed models can be successfully applied, along with the simulation tools across a wide range of carbon content from eutectic to hypoeutectic composition, for the alloys solidified at various cooling rates typical for both thin and thick walled complex shaped iron castings.

Place, publisher, year, edition, pages
Jönköping: Jönköping University, School of Engineering, 2019. p. 47
Series
JTH Dissertation Series ; 38
Keywords
Lamellar graphite iron, Primary austenite dendrite, Ultimate tensile strength, Microstructure model
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-43228 (URN)978-91-87289-40-8 (ISBN)
Public defence
2019-01-16, 10:30 (English)
Opponent
Supervisors
Available from: 2019-03-08 Created: 2019-03-04 Last updated: 2019-03-08Bibliographically approved

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Diaconu, Lucian VasileDiószegi, Attila

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