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Tensile properties of iron-based P/M steels with ferrite + martensite microstructure

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Abstract

The effect of intercritical heat treatments on the tensile properties of iron-based P/M steels was investigated. For this purpose, atomized iron powder (Ancorsteel 1000) was admixed with 0.3 wt.% graphite powder. Tensile test specimens were cold pressed at 700 MPa and sintered at 1120 °C for 30 min under pure argon gas atmosphere. After sintering, ∼20% pearlite volume fraction in a ferrite matrix was obtained. To produce coarse ferrite + martensite microstructures, the sintered specimens were intercritically annealed at 724 and 760 °C and quenched in water. To obtain fine ferrite + martensite microstructures, the sintered specimens were first austenitized at 890 °C and water-quenched to produce a fully martensitic structure. These specimens were then intercritically annealed at 724 and 760 °C and re-quenched. After the intercritical annealing at 724 and 760 °C and quenching, martensite volume fractions were ∼ 18% and 43%, respectively, in both the coarse- and fine-grained specimens. Although the intercritically annealed specimens exhibited higher yield and tensile strength than the as-sintered specimens, their elongation values were lower. Specimens with a fine ferrite + martensite microstructure showed high yield and tensile strength and ductility in comparison to specimens with a coarse ferrite + martensite microstructure. The strength values of specimens increased with increasing martensite volume fraction.

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Acknowledgements

The authors are grateful to the DPT (the State Planning Organization of Turkey) for the financial support given under project number 2002K120250 and to Northeastern University, USA, for the use of laboratory facilities.

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Authors and Affiliations

  1. Materials Division, Technical Education Faculty, Gazi University, 06500, Besevler-Ankara, Turkey

    A. Güral & S. Tekeli

  2. Department of Mechanical, Industrial and Manufacturing Engineering, Northeastern University, 334 Snell Engineering Centre, Boston, 02115, USA

    T. Ando

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  1. A. Güral
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  2. S. Tekeli
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  3. T. Ando
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Correspondence to S. Tekeli.

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Güral, A., Tekeli, S. & Ando, T. Tensile properties of iron-based P/M steels with ferrite + martensite microstructure. J Mater Sci 41, 7894–7901 (2006). https://doi.org/10.1007/s10853-006-0871-4

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  • DOI: https://doi.org/10.1007/s10853-006-0871-4

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