Effect of Silicon and Microstructure on Spheroidal Graphite Cast Iron Thermal Conductivity at Elevated Temperatures

Jalava, Kalle; Soivio, Kaisu; Laine, Jarkko; Orkas, Juhani

doi:10.1007/s40962-017-0184-1

Cited by 13 publications

(14 citation statements)

References 16 publications

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“…Micro-segregation should also benefit from this lower thermal conductivity. The thermal conductivity was also insensitive for up to 50% pearlite between RT and 400 °C [25].…”

Section: Intergranular and Transgranular Embrittlementmentioning

confidence: 99%

Influence of Strain Rate, Temperature and Chemical Composition on High Silicon Ductile Iron

Borgström¹

2021

Minerals

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Today, the use of solution hardened ductile iron is limited by brittleness under certain conditions. If chassis components are subjected to loads having high strain rates exceeding those imposed during tensile testing at sub-zero temperatures, unexpected failure can occur. Therefore, it is the purpose of this review to discuss three main mechanisms, which have been related to brittle failure in high silicon irons: intercritical embrittlement, the integrity of the ferritic matrix and deformation mechanisms in the graphite. Intercritical embrittlement is mainly attributed to the formation of Mg- and S-rich grain boundary films. The formation of these films is suppressed if the amount of free Mg- and MgS-rich inclusions is limited by avoiding excess Mg and/or by the passivation of free Mg with P. If the grain boundary film is not suppressed, the high silicon iron has very low elongations in the shakeout temperature regime: 300 to 500 °C. The integrity and strength of the ferrite are limited by the reduced ordering of the silicumferrite with increasing silicon content, once the “ordinary” ferrite is saturated at 3% silicon, depending on the cooling conditions. Finally, the graphite damaging mechanisms are what dictate the properties most at low temperatures (sub −20 °C).

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“…Micro-segregation should also benefit from this lower thermal conductivity. The thermal conductivity was also insensitive for up to 50% pearlite between RT and 400 °C [25].…”

Section: Intergranular and Transgranular Embrittlementmentioning

confidence: 99%

Influence of Strain Rate, Temperature and Chemical Composition on High Silicon Ductile Iron

Borgström¹

2021

Minerals

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“…The approach presented in this study relies on numerical analysis, where material properties depend on silicon content and the pearlite fraction. The thermal conductivity 5 and mechanical properties 6 of ductile iron can be described to a large degree as a function of silicon content and the pearlite fraction, as the spheroidal form of graphite contributes relatively little to these material property variables compared to other forms of graphite. These variables are used in the optimization loop shown in Figure 2.…”

Section: Approachmentioning

confidence: 99%

“…With a very low (1.5 wt%) Si content, the thermal conductivity of fully ferritic ductile iron is high, around 58 W/mK at 200°C, while it is only 29 W/ mK with a 4.3 wt% Si content. 5 Additions of other alloying elements also contribute to a decrease in thermal conductivity. One of these is molybdenum (Mo), which is used in addition to silicon alloying in the production of SiMo-ductile cast irons.…”

Section: Materials and Materials Modellingmentioning

confidence: 99%

“…When the pearlite fraction increases from 0 to 100%, thermal conductivity decreases from 39 to 30 W/mK (Si content 2.3%). 5 Thermal fatigue is an extremely complex failure mechanism, and cyclic loading and low material thickness further complicing this problem in cylinder heads. Consequently, many studies have been conducted on diesel-engine cylinder heads.…”

Section: Materials and Materials Modellingmentioning

confidence: 99%

“…The effect of silicon content and the pearlite fraction on thermal conductivity has been studied in earlier work. 5 Thermal conductivity of ferritic-pearlitic ductile irons can be estimated with the following equation: 6 k W mK ¼ 72:56 þ 0:06721t À 21:67Si ð%Þ À 0:2458Pe ð%Þ À 0:000161t 2 þ 2:173Si ð%Þ 2 þ 0:00414tSi ð%Þ þ 0:0541Si ð%ÞPe ð%Þ;…”

Section: Materials and Materials Modellingmentioning

confidence: 99%

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Ductile iron optimization approach for mechanically and thermally loaded components

et al. 2020

Self Cite

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The mechanical and thermal properties of ferritic–pearlitic ductile irons vary widely according to their silicon and pearlite contents. Thus, different combinations of silicon and pearlite affect components’ lifetime under mechanical and thermal stress. An excellent example of the usage of such irons is combustion engine cylinder heads. They experience transient thermal loading (heating and cooling) during starting and stopping in addition to mechanical loading (combustion) during engine operation. An optimization approach and calculation models for the estimation of the optimal ductile iron composition are presented in this study. The approach allows selection of the most suitable base composition for subsequent analyses, such as casting simulation and final accurate finite element modelling and fatigue calculations.

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On the Mechanical Properties and Thermal Conductivity of Compacted Graphite Cast Iron with Different Pearlite Contents

Ren

Jiang

Long

et al. 2023

J. of Materi Eng and Perform

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Effect of Silicon and Microstructure on Spheroidal Graphite Cast Iron Thermal Conductivity at Elevated Temperatures

Cited by 13 publications

References 16 publications

Influence of Strain Rate, Temperature and Chemical Composition on High Silicon Ductile Iron

Influence of Strain Rate, Temperature and Chemical Composition on High Silicon Ductile Iron

Ductile iron optimization approach for mechanically and thermally loaded components

On the Mechanical Properties and Thermal Conductivity of Compacted Graphite Cast Iron with Different Pearlite Contents

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