Analysis of the formation conditions and characteristics of interphase and random vanadium precipitation in a low-carbon steel during isothermal heat treatment

Sayed Ghafar Hashemi B. Eghbali

doi:10.1007/s12613-018-1577-8

Volume 25 Issue 3

Mar. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(3): 339-349

Sayed Ghafar Hashemi B. Eghbali, Analysis of the formation conditions and characteristics of interphase and random vanadium precipitation in a low-carbon steel during isothermal heat treatment, Int. J. Miner. Metall. Mater., 25(2018), No. 3, pp. 339-349. https://doi.org/10.1007/s12613-018-1577-8

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Sayed Ghafar Hashemi B. Eghbali, Analysis of the formation conditions and characteristics of interphase and random vanadium precipitation in a low-carbon steel during isothermal heat treatment, Int. J. Miner. Metall. Mater., 25(2018), No. 3, pp. 339-349. https://doi.org/10.1007/s12613-018-1577-8

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Research Article

Analysis of the formation conditions and characteristics of interphase and random vanadium precipitation in a low-carbon steel during isothermal heat treatment

Sayed Ghafar Hashemi B. Eghbali

+ Author Affiliations

Received: 3 June 2017; Revised: 11 July 2017; Accepted: 15 July 2017

Abstract

Abstract

The characteristics of nanosized precipitates in steels depend on the heat-treatment parameters. The effects of characteristics of vanadium precipitates formed during isothermal heat treatment on the hardness of the ferrite matrix in low-carbon vanadium-alloyed steel were investigated through analysis of transmission electron microscopy images and microhardness measurements. The results show that, during isothermal holding in the temperature range from 675 to 750℃, only interphase precipitation occurs, whereas only random precipitation occurs in the ferrite matrix during holding at 600℃. Furthermore, during isothermal heat treatment between 600 and 675℃, both random and interphase precipitates occurred in the ferrite. Nanoscale vanadium carbides with different atomic ratios of vanadium (V) and carbon (C) were the dominant precipitates in the random and interphase precipitates. The sizes of random precipitation carbides were smaller than those of interphase ones. Also, the sample isothermally heat treated at 650℃ for 900 s exhibited a higher hardness with a narrower hardness distribution.
- low carbon steel;
- vanadium carbide;
- precipitation;
- heat treatment;
- microhardness

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