Skip to content
Licensed Unlicensed Requires Authentication Published by De Gruyter December 30, 2021

Microstructure, Plastic Deformation Characteristics, and Mechanical Properties of As-cast and Ferritic Heat-treated SG-Iron in a Wide Range of Solidification Cooling Rates

Nabil Fatahalla, Taha Gomaa, Sherif Bahi and Mazen Negm

Abstract

The ferritic heat-treated SG-iron showed a decrease in strength by an average of 15 %, relative to the respective as-cast ingots. Meanwhile, an average increase in ductility of 30 % for sand mould ingots and of 240 to 490 % for the metal mould ingots was observed. Additionally, toughness improved for all investigated ingots due to the heat treatment (for metal mould ingots it showed an improvement range of 155 to 320 %). The, comparatively, drastic increase in ductility and toughness of the heat-treated ingots is discussed. The slip traces observed on the as-cast sand mould and ferritic heat-treated ingots were dominantly localised in the neighbourhood of graphite nodules and among them. A butterfly-like pattern of slip covered neighbouring ferrite grains revealing their grain boundaries. Differences in plastic deformation between ferrite and pearlite revealed the phase boundaries.


N. Fatahalla, T. Gomaa, S. Bahi, M. Negm Mechanical Department Faculty of Engineering Al Azhar University Cairo, Egypt

Literature

1 Fatahalla, N.; Bahi, S.; Hussein, O.: J. Mater. Sci. 31 (1996) 5765–5772.Search in Google Scholar

2 Fatahalla, N.; Hakim, H.A.; El Ezz, A.A.; Mohamed, M.: J. Mater. 4. Sci. 31 (1996) 4933–4937.Search in Google Scholar

3 Avner, S.: Introduction to Physical Metallurgy, 2nd ed., McGraw- 6. Hill, Kogakusha Ltd., Tokyo, New Delhi, Sydney (1974).Search in Google Scholar

4 Doubrava, J.: AFS Trans. 89 (1981) 229 – 250.Search in Google Scholar

5 Lin, Y.F.; Lui, T.S.; Chen, L.H.: Metall. Mater. Trans. 25A (1994) 821–825.Search in Google Scholar

6 Pan, E.; Hsu, W.; Loper, C.: AFS Trans. 96 (1988) 645–660.Search in Google Scholar

7 Skaland, T.: Scand. J. Metall. 21 (1992) 63–67.Search in Google Scholar

8 Kusakawa, T.: AFS Trans. 89 (1981) 737–754.Search in Google Scholar

9 Lee, S.; Lee, C.: AFS Trans. 96 (1988) 827–838.Search in Google Scholar

10 Stefanescu, D.: AFS Trans. 93 (1985) 835–848.Search in Google Scholar

11 Wade, N.; Ueda, Y.: J. Japan Foundrymen’s Soc. 50 (1979) 117–126.Search in Google Scholar

12 Bradley, W.; Srinivasan, M.: Intern. Mater. Rev. 35 (1990) 129–161.Search in Google Scholar

13 ASM; Metals Handbook (Heat Treating), Vol. 4 9th ed., ASM, Metals Park, OH (1981).Search in Google Scholar

14 Karsay, S.: Ductile Iron: The State of the Art, QIT Feret Titane Inc. – Canada (1982).Search in Google Scholar

15 Karsay, S.: Ductile Iron: The Production Practices, AFS for Metals, 2nd ed., USA (1979).Search in Google Scholar

16 Walton, C.: Grey and Ductile Iron Castings Handbook: Heat Treating of Ductile Iron, (1971).Search in Google Scholar

17 Mikelonis, P.: Modern Castings 72 (1982) 26 – 28.Search in Google Scholar

18 Aoyama, M.; Kobayashi, T.: Cast Metals 3 (1990) 122–128.Search in Google Scholar

19 Okorafor, O.: Scand. J. Metall. 16 (1987) 4–8.Search in Google Scholar

20 Fatahalla, N., Mohammad, M.; El Ezz, A.A.; Hakim, H.: Z. Metallkd. (to be published).Search in Google Scholar

21 Qifu, L.: Trans. Japan Foundrymen’s Soc., 12 (1993)18–24.Search in Google Scholar

22 Nakae, H.: Trans. Japan Foundrymen’s Soc. 11 (1992) 34–39.Search in Google Scholar

23 Rao, M.S.C.: AFS Trans. 96 (1988) 551–554.Search in Google Scholar

24 Metals Handbook (Casting) formerly 9th ed., Metals Handbook, ASM, Metals Park, Ohio, 15 (1992).Search in Google Scholar

25 Zakharov, B.: Heat Treatment of Metals, Peace Publishers, Moscow (1962).Search in Google Scholar

26 Metals Handbook (Metals Test Methods and Analytical Procedures), Vol. 3.01, ASM, Metals Park, Ohio (1990).Search in Google Scholar

27 Metals Handbook (Metallography and Microstructures), Vol. 9,9th ed., ASM, Metals Park, Ohio (1985).Search in Google Scholar

28 Briggs, J.; Farrar, J.; Hullings, D.: Foundry M & T 109 (1981) 100–105.Search in Google Scholar

29 Cahn, R.W.: Physical Metallurgy, North Holland Publishing Co., Amsterdam, London (1970).Search in Google Scholar

30 Askeland, D.; Gupta, S.: AFS Trans. 83 (1975) 313–320.Search in Google Scholar

31 ISO Recommendations (R 1083) (1969).Search in Google Scholar

32 Lazardis, N.: AFS Trans. 85 (1977) 277–288.Search in Google Scholar

33 Lakhtin, Y.: Engineering Physical Metallurgy, Mir Publishers, Moscow (1971).Search in Google Scholar

34 Salzbrenner, R.: J. Mater. Sci. 22 (1987) 2135–2147.Search in Google Scholar

35 Adewara, J.: AFS Trans. 84 (1976) 513–526.Search in Google Scholar

36 Adewara, J.; Loper, C.: AFS Trans. 84 (1976) 527 – 534.Search in Google Scholar

37 Era, H.; Kishitake, K.; Nagai, K.; Zhang, Z.: Mater. Sci. Techn. 8 (1992) 257–261.Search in Google Scholar

Received: 1998-03-30
Published Online: 2021-12-30

© 1998 Carl Hanser Verlag, München