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Microstructure and Hot Oxidation Resistance of SiMo Ductile Cast Irons Containing Si-Mo-Al

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Abstract

SiMo ductile cast irons are used as high-temperature materials in automotive components, because they are microstructurally stable at high operating temperatures. The effect of different amounts of Si and Mo as well as the addition of 3 wt pct Al on the microstructure, high-temperature oxidation, and mechanical properties of SiMo ductile cast iron was studied. Dilatometric measurements of SiMo ductile iron exhibited obvious differences in the transformation temperature A 1 due to presence of Al and the increase of Si. The microstructure of the SiMo alloys without Al addition showed outstanding nodularity and uniform nodule distribution. However, by adding 3 wt pct Al to low Si-SiMo ductile iron, some compacted graphite was observed. The results of oxidation experiments indicated that high Si-SiMo ductile iron containing 4 and 4.9 wt pct Si had superior resistance to lower Si-SiMo and SiMo ductile iron containing 3 wt pct Al. The results showed also that with increasing Si up to 4.9 wt pct or by replacing a part of Si with 3 wt pct Al, tensile strength increased while elongation and impact toughness decreased.

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Authors and Affiliations

  1. Central Metallurgical Research and Development Institute (CMRDI), P.O. Box 87, Helwan-El-Tebbin, Cairo, Egypt

    Mervat M. Ibrahim, Adel Nofal & M. M. Mourad

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  1. Mervat M. Ibrahim
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  2. Adel Nofal
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  3. M. M. Mourad
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Correspondence to Mervat M. Ibrahim.

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Manuscript submitted March 29, 2016.

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Ibrahim, M.M., Nofal, A. & Mourad, M.M. Microstructure and Hot Oxidation Resistance of SiMo Ductile Cast Irons Containing Si-Mo-Al. Metall Mater Trans B 48, 1149–1157 (2017). https://doi.org/10.1007/s11663-016-0871-y

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