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Strength prediction of lamellar graphite iron: From Griffith’s to hall-petch modified equation
RISE - Research Institutes of Sweden, Swerea, Swerea SWECAST.
Jönköping University, Sweden.
Jönköping University, Sweden.
2018 (English)In: Materials Science Forum, 2018, Vol. 925, p. 272-279Conference paper, Published paper (Refereed)
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
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
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-34549DOI: 10.4028/www.scientific.net/MSF.925.272Scopus ID: 2-s2.0-85050010996ISBN: 9783035710557 OAI: oai:DiVA.org:ri-34549DiVA, id: diva2:1237625
Conference
4 September 2017 through 7 September 2017
Available from: 2018-08-09 Created: 2018-08-09 Last updated: 2018-08-09Bibliographically approved

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