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Microstructural Characterization and Mechanical Properties of Free-Machining Sintered Steel Parts Containing up to 1 Wt Pct MnS

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Abstract

The effect of prealloying MnS up to 1.0 wt pct on the microstructural features of nonmetallic inclusions and their impacts on tensile and fatigue properties of 7.0 g/cm3 powder metal (P/M) steel (Fe-2.0Cu-0.7C) have been investigated. As the MnS content increases, larger, more irregular, and more closely spaced inclusions are obtained. While no significant impact on both static and dynamic properties was observed when prealloying up to 0.65 wt pct MnS, a decrease of more than 15 pct of the ultimate tensile strength and of the endurance limit was found when the MnS content reached 1.0 wt pct. The decrease in the ultimate tensile stress is attributed to a lower ductility of the sinternecks, as void initiation and void growth were promoted at lower stress levels by larger inclusions. The larger size of the MnS particles and the lower mean free path between nonmetallic inclusions also favor the initiation of microcracks and their coalescence into cracks, reaching fatigue fracture earlier.

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Acknowledgments

This research was supported by the Natural Sciences and Engineering Research Council of Canada. One of the authors (FB) acknowledges the financial support of Auto21 (C202-PM: Powder Metallurgy for High-Performance Automotive Components), Domfer Metal Powders Ltd., and École Polytechnique de Montréal.

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Authors and Affiliations

  1. Department of Mathematical and Industrial Engineering, Ecole Polytechnique de Montreal, Montreal, PQ, Canada, H3T 3A7

    Fabrice Bernier (Graduate Student), Jean-Paul Baïlon (Professor) & Gilles L’Espérance (Professor)

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  1. Fabrice Bernier
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  2. Jean-Paul Baïlon
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  3. Gilles L’Espérance
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Correspondence to Gilles L’Espérance.

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Manuscript submitted February 2, 2009.

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Bernier, F., Baïlon, JP. & L’Espérance, G. Microstructural Characterization and Mechanical Properties of Free-Machining Sintered Steel Parts Containing up to 1 Wt Pct MnS. Metall Mater Trans A 40, 2291–2300 (2009). https://doi.org/10.1007/s11661-009-9951-9

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