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Influence of Martensite Volume Fraction on Impact Properties of Triple Phase (TP) Steels

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Abstract

Ferrite-bainite-martensite triple phase (TP) microstructures with different volume fractions of martensite were obtained by changing heat treatment time during austempering at 300 °C. Room temperature impact properties of TP steels with different martensite volume fractions (V M) were determined by means of Charpy impact testing. The effects of test temperature on impact properties were also investigated for two selected microstructures containing 0 (the DP steel) and 8.5 vol.% martensite. Test results showed reduction in toughness with increasing V M in TP steels. Fracture toughness values for the DP and TP steels with 8.5 vol.% martensite were obtained from correlation between fracture toughness and the Charpy impact energy. Fractography of Charpy specimens confirmed decrease in TP steels’ toughness with increasing V M by considering and comparing radial marks and crack initiation regions at the fracture surfaces of the studied steels.

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  1. Department of Materials Science and Engineering, Sharif University of Technology, P.O. Box 11155-9466, Tehran, Iran

    Ahmad Zare & A. Ekrami

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  1. Ahmad Zare
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  2. A. Ekrami
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Correspondence to Ahmad Zare.

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Zare, A., Ekrami, A. Influence of Martensite Volume Fraction on Impact Properties of Triple Phase (TP) Steels. J. of Materi Eng and Perform 22, 823–829 (2013). https://doi.org/10.1007/s11665-012-0312-2

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  • DOI: https://doi.org/10.1007/s11665-012-0312-2

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