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Comparison Between Vanadium and Niobium Effects on the Mechanical Properties of Intercritically Heat Treated Microalloyed Cast Steels

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Abstract

In this study, a comparison between V- and Nb-containing low-carbon microalloyed cast steels has been made in terms of strength and impact energy after intercritical heat treatment (IHT). After austenitizing at 950 °C and quenching in water, the alloys were intercritically heated at 760, 800 or 840 °C followed by quenching and tempering at 620 °C. In comparison with conventional heat treatment, IHT increased the impact energies at the expense of some reduction in the strength due to the dual ferritic/martensitic microstructure. However, the impact energy of the alloy containing only V, especially after intercritical heating at 760 and 800 °C, was higher than that of the Nb-containing samples. The improvement in the impact energy required an optimum amount of coarse carbonitride precipitates. While, the impact fracture surface of the alloy V was composed of dimples indicating ductile fracture, cleavage facets in the fracture surface of Nb-containing samples indicated brittle fracture.

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Authors and Affiliations

  1. Department of Materials Engineering, Science and Research Branch, Islamic Azad University, 14515/755, Tehran, Iran

    Morteza Kalantar, Hamidreza Najafi & M. Reza Afshar

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  1. Morteza Kalantar
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  2. Hamidreza Najafi
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  3. M. Reza Afshar
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Correspondence to Hamidreza Najafi.

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Kalantar, M., Najafi, H. & Afshar, M.R. Comparison Between Vanadium and Niobium Effects on the Mechanical Properties of Intercritically Heat Treated Microalloyed Cast Steels. Met. Mater. Int. 25, 229–237 (2019). https://doi.org/10.1007/s12540-018-0154-z

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