Elevated temperature thermal conductivities of some as-cast and austempered cast irons

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

doi:10.1080/02670836.2017.1389117

Cited by 6 publications

(5 citation statements)

References 25 publications

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“…In recent years, the new generation of high silicon ductile iron called solution strengthened ferritic ductile irons has attracted great attention of researchers and engineers [1][2][3][4]. High silicon contents improve machinability [5][6][7][8], high-temperature oxidation [9] and corrosion resistance [10,11], and prevent eutectic carbides formation [12,13].…”

Section: Introductionmentioning

confidence: 99%

Effects of cobalt on mechanical properties of high silicon ductile irons

González-Martínez

Sertucha

Lacaze

2020

Materials Science and Technology

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High silicon ductile irons are being developed due to their advantages relating to pearlitic-ferritic grades (high ductility, fully ferritic structures, good machinability, etc.). Recent studies reported that silicon contents higher than 5.2 wt.% originates drastic embrittlement due to chemical ordering. For improving the mechanical properties, addition of other alloying elements becomes an interesting way of work. This study focuses on the cobalt effect on as-cast microstructures and mechanical properties of ductile irons with silicon contents that maximize ultimate tensile strength. The results obtained show that addition of 4 wt.% cobalt increases the ultimate tensile strength by about 10% and decreases the silicon content at the maximum in this property respecting the unalloyed alloys because cobalt enhances ordering as does silicon.

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Section: Introductionmentioning

confidence: 99%

Effects of cobalt on mechanical properties of high silicon ductile irons

González-Martínez

Sertucha

Lacaze

2020

Materials Science and Technology

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“…The thermal conductivity for the sand-castings (C1 and C2) and the re-melting (C3) experiment is plotted against tensile strength in Figure 5, as well as results from works on the effect of the production parameters on the tensile and thermal properties of different cast iron grades. [14][15][16][17][18][19] These works analyzed how the thermal conductivity and tensile strength are affected by the inoculation, 14 CE and Mo contents, 15 graphite sphericity, 16 nodularity and microstructure constituents. [17][18][19] The very small p value indicates the statistical significance of the relationship obtained.…”

Section: Resultsmentioning

confidence: 99%

“…[14][15][16][17][18][19] These works analyzed how the thermal conductivity and tensile strength are affected by the inoculation, 14 CE and Mo contents, 15 graphite sphericity, 16 nodularity and microstructure constituents. [17][18][19] The very small p value indicates the statistical significance of the relationship obtained. The results show a high coefficient of determination R 2 , meaning that there is a high degree of dependency between the two variables.…”

Section: Resultsmentioning

confidence: 99%

Relationship Between Thermal Conductivity and Tensile Strength in Cast Irons

Fourlakidis

Hernando²,

Holmgren³

et al. 2023

Inter Metalcast

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Improved mechanical and thermal properties are important characteristics for enhancing the performance of cast iron components that operate at elevated temperatures. Thermal conductivity defines the temperature distribution within the casting and influences the magnitude of the thermally induced tensile stresses. The microstructural features that increase the thermal conductivity have a negative impact on tensile strength. The results reported in this work show that there is a unique inverse relationship between thermal conductivity and tensile strength, valid for the whole range of cast iron alloys regardless of graphite form, solidification rates, carbon content and matrix constituents. The finding indicates the challenges for the simultaneous improvement of these properties, and it can be utilized as a guideline during the design of cast iron components for high temperature applications.

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“…This is a favourable phenomenon from the viewpoint of the possibility to obtain a structure durable in a wide range of temperatures. However, this restricts the possibility to obtain, by heat treatment, a hard and abrasion resistant structure, with respect to the properties similar to those of the austempered ductile (ADI) cast iron [11,12,13,14,15,16,17,18,19,20,21,22,23,24,25].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cr, Mo and Al on Microstructure, Abrasive Wear and Corrosion Resistance of Ni-Mn-Cu Cast Iron

et al. 2019

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Results of a study on influence of Cr, Mo and Al on the microstructure, abrasive wear and corrosion resistance of Ni-Mn-Cu cast iron in the as-cast and heat-treated conditions are presented. Because of the chilling effect of first two elements (tendency to create hard spots), graphitising Al was added to the alloys, with the highest concentration of Cr and Mo. All castings in the as-cast condition showed an austenitic matrix, guaranteeing good machinability. Heat treatment of raw castings, consisting in annealing at 500 °C for 4 h, resulted in partial transformation of austenite. As a result the carbon-supersaturated acicular ferrite, morphologically similar to bainitic ferrite was formed. The degree of this transformation increased with increasing concentrations of Cr and Mo, which successively decreased the thermodynamic stability of austenite. A change of matrix structure made it possible to significantly increase hardness and abrasive-wear resistance of castings. The largest increment of hardness and abrasion resistance was demonstrated by the castings with the highest total concentration of Cr and Mo with an addition of 0.4% Al. Introduction of Cr and Mo also resulted in an increase of corrosion resistance. In the heat-treated specimens, increasing the concentration of Cr and Mo resulted in a successive decrease of the depth of corrosion pits, with an increase in their number at the same time. This is very favourable from the viewpoint of corrosion resistance.

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Elevated temperature thermal conductivities of some as-cast and austempered cast irons

Cited by 6 publications

References 25 publications

Effects of cobalt on mechanical properties of high silicon ductile irons

Effects of cobalt on mechanical properties of high silicon ductile irons

Relationship Between Thermal Conductivity and Tensile Strength in Cast Irons

Effect of Cr, Mo and Al on Microstructure, Abrasive Wear and Corrosion Resistance of Ni-Mn-Cu Cast Iron

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