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High-Cycle Fatigue Resistance of Si-Mo Ductile Cast Iron as Affected by Temperature and Strain Rate

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Abstract

Silicon–molybdenum ductile cast irons are used to fabricate exhaust manifolds of internal combustion engines of large series cars, where the maximum pointwise temperature at full engine load may be higher than 973 K (700 °C). In this application, high-temperature oxidation and thermo-mechanical fatigue (the latter being caused by the engine start and stop and by the variation of its power output) have been the subject of several studies and are well known, whereas little attention has been devoted to the high-cycle fatigue, arising from the engine vibration. Therefore, the mechanical behavior of Si-Mo cast iron is studied here by means of stress-life fatigue tests up to 10 million cycles, at temperatures gradually increasing up to 973 K (700 °C). The mechanical characterization is completed by tensile and compressive tests and ensuing fractographic examinations; the mechanical test results are correlated with the cast iron microstructure and heat treatment.

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Acknowledgments

The authors wish to acknowledge the contributions of the FOM Tacconi foundry company (Perugia, Italy), of Mr. S. Plano, Centro Ricerche FIAT (Torino, Italy), and of B.Sc. C. Mariotti, formerly with Politecnico di Torino (Torino, Italy).

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Authors and Affiliations

  1. DISAT Department, Politecnico di Torino (Turin Technical University), Corso Duca degli Abruzzi 24, 10129, Turin, Italy

    Paolo Matteis (Associate Professor), Giorgio Scavino (Associate Professor) & Donato Firrao (Full Professor)

  2. Centro Ricerche FIAT, Corso Settembrini 40, 10135, Turin, Italy

    Alessandro Castello (Formerly Senior Metallurgist, Supplier Quality Engineer)

  3. Oerlikon Graziano S.p.A, Rivoli, Italy

    Alessandro Castello (Formerly Senior Metallurgist, Supplier Quality Engineer)

Authors
  1. Paolo Matteis
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  2. Giorgio Scavino
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  3. Alessandro Castello
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  4. Donato Firrao
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Corresponding author

Correspondence to Paolo Matteis.

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Manuscript submitted April 16, 2015.

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Matteis, P., Scavino, G., Castello, A. et al. High-Cycle Fatigue Resistance of Si-Mo Ductile Cast Iron as Affected by Temperature and Strain Rate. Metall Mater Trans A 46, 4086–4094 (2015). https://doi.org/10.1007/s11661-015-3029-7

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  • DOI: https://doi.org/10.1007/s11661-015-3029-7

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