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The Effects of One and Double Heat Treatment Cycles on the Microstructure and Mechanical Properties of a Ferritic–Bainitic Dual Phase Steel

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Abstract

In this study, samples with ferritic–bainitic dual phase structures consisting of 62 pct bainite were obtained from the AISI 4140 steel by applying one and double heat treatment cycles. Microstructural investigations by electron and optical microscopy indicated that the sample heat treated through double cycle benefited from finer ferrite and bainite grains. Additionally, results obtained from mechanical tests implied that the double-cycle heat-treated sample not only has a higher tensile strength as well as ultimate strength but also benefits from a higher ductility along with a higher impact energy than the one-cycle heat-treated sample. Moreover, fractography results showed that the type of fracture in both samples is a combination of the brittle and the ductile fracture. Besides, the ratio of the ductile fracture is higher for the double-cycle heat-treated sample than for the one-cycle sample, due to the lower aggregation of sulfur at grain boundaries.

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Authors and Affiliations

  1. Faculty of Materials and Metallurgical Engineering, Semnan University, P.O. Box: +98, Semnan, 35131-19111, Iran

    Reza Piri, Behrooz Ghasemi & Mardali Yousefpour

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  1. Reza Piri
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  2. Behrooz Ghasemi
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  3. Mardali Yousefpour
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Correspondence to Behrooz Ghasemi.

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Manuscript submitted May 5, 2017.

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Piri, R., Ghasemi, B. & Yousefpour, M. The Effects of One and Double Heat Treatment Cycles on the Microstructure and Mechanical Properties of a Ferritic–Bainitic Dual Phase Steel. Metall Mater Trans A 49, 938–945 (2018). https://doi.org/10.1007/s11661-017-4460-8

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