Modeling of ferrite growth in nodular cast iron

Wessén, Magnus; Svensson, Ingvar L

doi:10.1007/bf02651875

Cited by 53 publications

(29 citation statements)

References 6 publications

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“…During this stage the amount of graphite will increase from about 7 to 10 Vol pct. [15]. When the eutectoid temperature is reached the areas close to the graphite nodules with the low content of carbon will be transformed to ferrite while the areas far away from the nodules will have a higher content of carbon so that pearlite forms.…”

Section: Influence Of the Small Particles On The Solidificationmentioning

confidence: 99%

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Graphite nodule count and size distribution in thin-walled ductile cast iron

Pedersen

Tiedje

2008

Materials Characterization

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Section: Influence Of the Small Particles On The Solidificationmentioning

confidence: 99%

“…According to [15] the fraction of graphite will increase from about 0.07 after the solidification to about 0.1 after cooling to room temperature. Taking that into account Eq.…”

Section: Introductionmentioning

confidence: 99%

Graphite nodule count and size distribution in thin-walled ductile cast iron

Pedersen

Tiedje

2008

Materials Characterization

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“…In recent years research has been performed to extend the functionality of casting simulation software to predict the solidification process [12], microstructure formation [13] and mechanical material behaviour on a local level throughout the component [1,2,4,12,13]. The possibilities to use this predicted microstructure-based mechanical behaviour in FEM simulations has however been limited.…”

Section: Introductionmentioning

confidence: 99%

The effects of local variations in mechanical behaviour – Numerical investigation of a ductile iron component

Olofsson

Svensson

2013

Materials & Design

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The effects of incorporating local mechanical behaviour into a structural analysis of a cast ductile iron component are investigated. A recently presented simulation strategy, the closed chain of simulations for cast components, is applied to incorporate local behaviour predicted by a casting process simulation into a Finite Element Method (FEM) structural analysis, and the effects of the strategy on predicted component behaviour and simulation time are evaluated. The results are compared to using a homogeneous material description. A material reduction method is investigated, and the effects of material reduction and number of linearization points are evaluated.The results show that local mechanical behaviour may significantly affect the predicted behaviour of the component, and a homogeneous material description fails to express the stress-strain distribution caused by the local variations in mechanical behaviour in the component. The material reduction method is able to accurately describe this effect while only slightly increasing the simulation time. It is proposed that local variations in mechanical behaviour are important to consider in structural analyses of the mechanical behaviour of ductile iron components.

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“…12,13) • Upon cooling, the results showed that ferrite growth can start at very low undercooling with respect to Tα while pearlite needs some finite undercooling relative to Tp to appear. 14) For modelling the eutectoid transformation, it has been accepted that ferrite appears at the interface between austenite and graphite 15,16) giving rise to the bull-eye structure. In some cases however, intergranular ferrite may precipitate upon cooling before bull-eye ferrite after reaustenitization.…”

Section: Introductionmentioning

confidence: 99%

Critical Temperature Range in Standard and Ni-bearing Spheroidal Graphite Cast Irons

et al. 2012

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Describing the conditions for reaustenitization of spheroidal graphite cast irons is of interest for their heat-treatment after casting, e.g. for manufacturing austempered ductile irons. Differential thermal analysis has been used to characterize the direct eutectoid transformation and the reverse transformation, i.e. the reaustenitization. This has been applied to a standard and a Ni-bearing alloy, with a ferritic matrix for the former, both a ferritic and a pearlitic matrix for the latter. The results are discussed in relation with the stable and metastable three phase fields. While earlier description of the direct eutectoid transformation is confirmed, the one for reverse eutectoid has been found more complex and is amended.

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Modeling of ferrite growth in nodular cast iron

Cited by 53 publications

References 6 publications

Graphite nodule count and size distribution in thin-walled ductile cast iron

Graphite nodule count and size distribution in thin-walled ductile cast iron

The effects of local variations in mechanical behaviour – Numerical investigation of a ductile iron component

Critical Temperature Range in Standard and Ni-bearing Spheroidal Graphite Cast Irons

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