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Application of thermal analysis in solidification pattern control of La-inoculated grey cast irons

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Abstract

The new generation of acid-lined medium-frequency coreless induction furnaces revolutionized the iron foundries, resulting higher overheating and lower S and Al content iron melt, characterized by higher eutectic undercooling solidification and consequently high chill [carbides] and unfavourable undercooled graphite morphologies sensitiveness. Having established that Al, Zr, Ti, Ca, Ba and La appear to have a key role in graphite nucleation in grey cast iron, thermal [cooling curves] investigations are undertaken to explore their effects on solidification parameters. The experimental heats are obtained in acid-lined coreless induction melting. Some important active elements are added to FeSi-based alloy, usually used as conventional inoculant in cast iron foundry industry, resulting complex inoculating systems [Al, Ca–La; Al, Ca–La, Zr; Al, Ca–La, Ba; Al, Ca–La, Zr, Ba; Al, Ca–La, Zr, Ti and Al, Ca–La, Zr, Ba, Ti]. In-mould [ceramic cup, cooling modulus of approximately 0.75 cm] inoculation is applied directly in the Quik-cup™ cooling curve analysis equipment, for the same alloy addition rate. The La effects are evaluated in low S and Al, high overheated electric grey iron solidification pattern with and without any other oxide-sulphides forming elements contribution. Study is focused on the representative temperatures during eutectic reaction and at the end of solidification, and it results in an undercooling referring to equilibrium eutectic temperature in the stable and metastable solidification system. As primary evaluation for general application, La, Ca, Al–FeSi alloy have a high efficiency in low S and Al and higher carbon equivalent grey cast irons, electrically melting, without any other active elements contribution. For specific applications, more complex La-bearing alloys are recommended, such as for higher dendritic austenite amount promotion [LaBaZrTi–FeSi alloy] or for lower eutectic recalescence [LaBaZr–FeSi alloy].

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References

  1. Chisamera M, Stan S, Riposan I, Costache G, Barstow M. Solidification pattern of In-Mold and ladle inoculated low sulfur hypoeutectic gray cast irons. AFS Trans. 2008;116:641–52.

    CAS  Google Scholar 

  2. Riposan I, Chisamera M, Stan S, Skaland T, Onsoien MI. Analyses of possible nucleation sites in Ca/Sr overinoculated grey irons. AFS Trans. 2001;109:1151–62.

    CAS  Google Scholar 

  3. Riposan I, Chisamera M, Stan S, Hartung C, White D. Three-stage model for the nucleation of graphite in grey cast iron. Mater Sci Technol. 2010;26(12):1439–47.

    Article  CAS  Google Scholar 

  4. Riposan I, Chisamera M, Stan S, Stefan E, Hartung C. Role of lanthanum in graphite nucleation in grey cast iron. Key Eng Mater. 2011;457:19–24.

    Article  CAS  Google Scholar 

  5. Anton IV, Riposan I. Structure characteristics of Ce-inoculated, low sulphur grey cast irons. Solid State Phenom. 2012;188:318–23.

    Article  CAS  Google Scholar 

  6. Riposan I, Stefan IC, Firican MC, Stan S, Naro RL, Williams DC. Increasing the inoculant potency of commercial inoculating alloys in induction melting grey cast iron. AFS Trans. 2015;123:227–42.

    Google Scholar 

  7. Riposan I, Chisamera M, Stan S. Enhanced quality in electric melt grey cast irons. ISIJ Int. 2013;53(10):1683–95.

    Article  CAS  Google Scholar 

  8. Riposan I, Chisamera M, Stan S. The role of compounds in graphite formation in cast iron—a review. Mater Sci Forum. 2018;925:3–11.

    Article  Google Scholar 

  9. Riposan I, Chisamera M, Stan S, Uta V, Stefan IC, Firican MC, Naro RL, Williams DC. Demystifying the effects of sulphur in cast irons. AFS Trans. 2016;124:247–66.

    Google Scholar 

  10. Stefanescu DM. Thermal analysis-theory and applications in metalcasting. Int J Metalcast. 2015;9(1):7–22.

    Article  CAS  Google Scholar 

  11. Sparkman D, Bhaskaram CA. Chill measurement by thermal analysis. AFS Trans. 1996;104:969–76.

    CAS  Google Scholar 

  12. Kanno T, Fukuda Y, Kang I, Morinaka M, Nakae H. Prediction of chilling tendency in cast iron using three cups thermal analysis system. J JFS. 1998;70:773–8.

    CAS  Google Scholar 

  13. Kanno T, Nakae H. Prediction of graphite types and mechanical properties in cast iron using three cups thermal analysis. J JFS. 2000;72:175–80.

    CAS  Google Scholar 

  14. Emadi D, Whiting LV, Nafisi S, Ghomashchi R. Applications of thermal analysis in quality control of solidification processes. J Therm Anal Calorim. 2005;81:235–42.

    Article  CAS  Google Scholar 

  15. Dioszegi A, Svensson IL. On the problems of thermal analysis of solidification. Mater Sci Eng A. 2005;413–414:474–9.

    Article  CAS  Google Scholar 

  16. Sparkman D. Microstructure by thermal analysis. AFS Trans. 2011;119:413–9.

    CAS  Google Scholar 

  17. Upadhya KG, Stefanescu DM, Lieu K, Yeager DP. Computer-aided cooling curve analysis: principles and applications in metal casting. AFS Trans. 1989;97:61–6.

    Google Scholar 

  18. Barlow JO, Stefanescu DM. Computer-aided cooling curve analysis revisited. AFS Trans. 1997;104:349–54.

    Google Scholar 

  19. Stefanescu DM, Moran M, Boonmee S, Guesser WL. The use of combined liquid displacement and cooling curve analysis in understanding the solidification of cast irons. AFS Trans. 2012;120:365–74.

    CAS  Google Scholar 

  20. Stan S, Chisamera M, Riposan I, Barstow M. Applications of thermal analysis to monitor the quality of hypoeutectic cast irons during solidification in sand and metal moulds. J Therm Anal Calorim. 2012;110(3):1185–92.

    Article  CAS  Google Scholar 

  21. Riposan I, Chisamera M, Stan S, Barstow M. Identifying chill tendency of cast iron melts by thermal analysis. Int J Cast Met Res. 2013;26(3):152–9.

    Article  CAS  Google Scholar 

  22. Klancnik U, Habjan J, Klancnik G, Medved J. Thermal analysis of indefinite chill cast iron modified with ferrovanadium and ferrotungsten. J Therm Anal Calorim. 2017;127:71–8.

    Article  CAS  Google Scholar 

  23. Riposan I, Chisamera M, Stan S. Application of cooling curve analysis in solidification pattern and structure control of grey cast irons. J Therm Anal Calorim. 2018;132:1017–28.

    Article  CAS  Google Scholar 

  24. Chisamera M, Riposan I, Stan S, Stefan E, Costache G. Thermal analysis control of in-mould and ladle inoculated grey cast irons. China Foundry. 2009;6:145–51.

    CAS  Google Scholar 

  25. Zhou J. Color metallography of cast irons. China Foundry. 2009;6:52–69.

    Google Scholar 

  26. Wang B, Fu D, Shan G. Effect of Rare-earth element lanthanum on structure and performance of gray casting iron. Hot Working Technology. 2008. http://en.cnki.com.cn/Journal_en/B-B022-SJGY-2008-13.htm.

  27. Sofroni L, Riposan I, Brabie V, Chisamera M. Cast iron. Bucharest, Romania: Editura Didactica si Pedagogica Publisher [Romanian language]; 1985, p. 36–49.

  28. Riposan I, Chisamera M, Stan S, Toboc P, Grasmo G, White D, Ecob C, Hartung C. Benefits of residual aluminum in ductile iron. J Mater Eng Perform. 2011;20(1):57–64.

    Article  CAS  Google Scholar 

  29. Sillen RV. Novacast technologies. 2006. www.novacast.se.

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Authors and Affiliations

  1. Politehnica University of Bucharest, 060042, Bucharest, Romania

    Eduard Stefan, Iulian Riposan & Mihai Chisamera

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  1. Eduard Stefan
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  2. Iulian Riposan
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  3. Mihai Chisamera
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Correspondence to Iulian Riposan.

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Stefan, E., Riposan, I. & Chisamera, M. Application of thermal analysis in solidification pattern control of La-inoculated grey cast irons. J Therm Anal Calorim 138, 2491–2503 (2019). https://doi.org/10.1007/s10973-019-08714-7

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  • DOI: https://doi.org/10.1007/s10973-019-08714-7

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