The changes of ADI structure during high temperature annealing

• Autorzy: Krzyńska A. , Kaczorowski M.
• Języki publikacji: EN

Abstrakty

EN

The results of structure investigations of ADI during it was annealing at elevated temperature are presented. Ductile iron austempered at temperature 325 °C was then isothermally annealed 360 minutes at temperature 400, 450, 500 and 550 °C. The structure investigations showed that annealing at these temperatures caused substantial structure changes and thus essential hardness decrease, which is most useful property of ADI from point of view its practical application. Degradation advance of the structure depends mainly on annealing temperature, less on the time of the heat treatment. It was concluded that high temperature annealing caused precipitation of Fe₃C type carbides, which morphology and distribution depend on temperature. In case of 400 °C annealing the carbides precipitates inside bainitic ferrite lath in specific crystallographic planes and partly at the grain boundaries. The annealing at the temperature 550 °C caused disappearing of characteristic for ADI needle or lath – like morphology, which is replaced with equiaxed grains. In this case Fe₃C carbides take the form very fine precipitates with spheroidal geometry.

Słowa kluczowe

EN

ADI structure; mechanical properties; high temperature annealing

PL

ADI; właściwości mechaniczne; wygrzewanie wysokotemperaturowe

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2010
• Tom: Vol. 10, iss. 1 spec.
• Strony: 87--92
• Opis fizyczny: Bibliogr. 7 poz., rys., tab., wykr.

Twórcy

autor

Krzyńska A.

• Institute of Materials Processing, Faculty of Production Engineering, Warsaw University of Technology, ul. Narbutta 85, 02-524 Warszawa, Poland

autor

Kaczorowski M.

• Institute of Mechanics and Design, Faculty of Production Engineering, Warsaw University of Technology, ul. Narbutta 85, 02-524 Warszawa, Poland

Bibliografia

• [1] J.F. Janowiak, R.B. Gundlach: Development of Ductile Iron for Commercial Austempering, AFS Transactions, 86 (1983)p. 377.
• [2] The Solrelmetal Book of Ductile Iron, RIO TINTO&Titanium INC., Montreal (Quebec) Canada, 2004.
• [3] G. Thomas, M. Goringe: Transmission Electron Microscopy of Materials, John Wiley & Sons Inc, New York, 1979.
• [4] P.B. Hirsh, A. Howie, R.B. Nicholson, M.J. Whelan: Transmission Electron Microscopy of Thin Crystals, London, Butterworths, 1965.
• [5] S. Amelinckx, R. Gevers, G. Remaut, J. Van Landuyt: Modern Diffraction and Imaging Techniques in Materials Science, North-Holland Publishing Co, Amsterdam, 1970.
• [6] L.M. Utevskij: Diffrakcionnaja Elektronnaja Mikroskopija w Metallovedenii, Moskwa, 1973.
• [7] K.W. Andrews, D.J. Dyson, S.R. Keown: Interpretation of Electron Diffraction Patterns, London, 1968.