Prediction of Microstructure in ADI Castings

Open access

Abstract

Tests were carried out on samples of low-alloy ductile iron with additions of Ni, Cu and Mo, subjected to austempering heat treatment. The samples were austenitized at 850, 900 and 950 °C, and then austempered at T = 210, 240, 270, 300 and 330 °C. The ausferritizing treatment was carried out in a salt bath for the time τ = 2 - 8 hours. Additionally, tests and studies covered samples subjected to the ausferritizing treatment at 270 °C with the time of holding castings in a bath from 2 to 24 hours. Evaluation covered the results of the ADI microstructure examinations and hardness measurements. The ADI matrix morphology was identified counting the average number of ausferrite plates and measuring their width and spacing. The regression equations HB = f (τ, T) and τ = f (HB, T) were derived to establish the, so-called, “process window”, allowing obtaining a priori the required microstructure of ADI and, consequently, the required mechanical properties, mainly hardness, shaping the functional properties of castings, abrasion wear resistance – in particular.

[1] A. Korzyńska, A. Kochański, Properties and Structural of High-Silicone Austempered Ductile Iron, Archives of Foundry Engineering 14 (2), 91-94, (2014).

[2] T. Giętka, K. Cichacki, T. Szykowny, Influence of temperature on impact strength ADI cast iron, Archives of Foundry Engineering 2(15), 87-92 (2015).

[3] A. Korzyńska, A. Kochański, Austenitization of Ferritic Ductile Iron, Archives of Foundry Engineering 14(4), 49-54 (2014).

[4] A. Giętka, T. Szykowny, Microstructure and Mechanical Properties of ADI Depending on Austenitization Method and Parameters, Archives of Foundry Engineering. 12(2), 19-24 (2012).

[5] T. Giętka, S. Dymski, The attempt at evaluation of the ADI microstructure with the use of the image analysis, Archives of Foundry Engineering 10(2), 57-62 (2010).

[6] A. Krzyńska, M. Kaczorowski, The changes of ADI structure during high temperature annealing, Archives of Foundry Engineering 10(1), 87-92 (2010).

[7] M. Kaczorowski, P. Skoczylas, A. Krzyńska, On the possibility of replacing high manganese cast steel military vehicle track pads with ADI, Archives of Foundry Engineering 10(1), 81-86 (2010).

[8] A. Krzyńska, M. Kaczorowski, Low alloy steel versus ADI – differences and similarities, Archives of Foundry Engineering 9(1), 151-156 (2009).

[9] D. Myszka, M. Kaczorowski, Structural Research of Direct Austepered Ductile Irons Obtain in Sand Moulds, Archives of Foundry Engineering 1(1/2) (2009).

[10] J. Furmanek, F. Binczyk, P. Gradoń, Effect of post-weld treatment parameters on the microstructure of ADI cast iron, Raport IMŻ, No. 4, 2010,

[11] M. Sokolnicki, E. Guzik, Austempered ductile iron to work in the conditions of dynamic load, Archives of Foundry Engineering, Archives of Foundry Engineering / Polish Academy of Sciences. Commission of Foundry Engineering. —14 spec. iss. 4,115–118 (2014).

[12] D. Myszka, K. Wasiluk, E. Skołek, W. Świątkowski, Nanoausferritic matrix of ductile iron, Materiale Science and Technology 31(7), 829-834 (2015).

[13] M. A. Yescas-Gonzalez, Modelling The Microstructure and Mechanical Properties of Austempered Ductile Cast Iron, http://slideplayer.com/slide/4922879/

[15] A. Vasko, Influence of Transformation Temperature on Structure and Mechnical Properties pf Austempered Ductile Iron, Acta Metallurgica Slovaca 17(1), 45-50 (2011).

[16] O. Eric, D. Rajnovic, L. Sidjanin, S. Zec, M. Janovic, An austempering study of ductile iron alloyed with copper, J. Serb. Chem. Soc. 70 (7), 1015–1022 (2005).

Archives of Metallurgy and Materials

The Journal of Institute of Metallurgy and Materials Science and Commitee on Metallurgy of Polish Academy of Sciences

Journal Information


IMPACT FACTOR 2016: 0.571
5-year IMPACT FACTOR: 0.776

CiteScore 2016: 0.85

SCImago Journal Rank (SJR) 2016: 0.347
Source Normalized Impact per Paper (SNIP) 2016: 0.740

Cited By

Metrics

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 150 147 17
PDF Downloads 99 97 11