Abrasion resistance and toughness of a ductile iron produced by two molding processes with a short austempering

Dueñas, J.R.; Hormaza, W.; Güiza, G.M. Castro

doi:10.1016/j.jmrt.2019.02.014

Cited by 7 publications

(2 citation statements)

References 17 publications

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“…The change in structure from the ductile iron to the austempered ductile iron (ADI), results in the improvement of selected functional properties, e.g. the abrasion resistance [11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Jakubus

2022

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The article presents the results of research on the abrasion resistance of cast iron with vermicular graphite in the as-cast state and after austempering (the latter material is referred to as AVGI -Austempered Vermicular Graphite Iron). Austenitization was carried out at the temperature values of either 900°C or 960°C, and austempering at the temperature values of either 290°C and or 390°C. Both the austenitization and the austempering time was equal to 90 minutes. The change of the pearlitic-ferritic matrix to the ausferritic one resulted in an increase in mechanical properties. Abrasion tests were conducted by means of the T-01M pin-on-disc tribometer. The counter-sample (i.e. the disc) was made of the JT6500 friction material. Each sample was subject to abrasion over a sliding distance of 4000 m. The weight losses of both samples and counter-samples were determined by the gravimetric method. It was found that the vermicular cast iron austenitized at 900°C and austempered at 290°C was characterized by the lowest wear among the evaluated cast iron types. The geometric structure of the surface layer after the dry friction test exhibited irregular noticeable grooves, distinct oriented abrasion traces, plastic flow of the material, microcracks, and pits generated by tearing out the abraded material. The largest surface roughness was found for the AVGI cast iron heat-treated according to the variant 3 (Tγ =900 ºC; Tpi = 390°C), while the smallest one occurred in AVGI cast iron subject to either the variant 2 (Tγ =960 ºC; Tpi = 290°C) or the variant 4 (Tγ =900 ºC; Tpi = 290°C) of heat treatment and was equal to either 2.5 µm or 2.66 µm, respectively. It can be seen that the surface roughness decreases with the decrease in the austempering temperature.

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Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Jakubus

2022

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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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Wear behavior of a multiphase ductile iron produced by quenching and partitioning process

Dong

Zhou

et al. 2021

Engineering Failure Analysis

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Abrasion resistance and toughness of a ductile iron produced by two molding processes with a short austempering

Cited by 7 publications

References 17 publications

Archives of Foundry Engineering

Archives of Foundry Engineering

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

Wear behavior of a multiphase ductile iron produced by quenching and partitioning process

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