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Metals 2019, 9(2), 268; https://doi.org/10.3390/met9020268

Influence of Vanadium Microalloying on Deformation-Induced Pearlite Transformation of Eutectoid Steel

1,2
,
1,2
,
1,3,*
,
1,3
and
1,3
1
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2
Wuhan Branch of Baosteel Central Research Institute, Wuhan 430080, China
3
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
*
Author to whom correspondence should be addressed.
Received: 12 February 2019 / Revised: 20 February 2019 / Accepted: 20 February 2019 / Published: 25 February 2019
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Abstract

In order to investigate the influence of vanadium microalloying on deformation-induced pearlite transformation (DIPT) of eutectoid steel, thermomechanical simulation tests were carried out in this study. The following four compositions of vanadium microalloying were applied in the tests: vanadium free in Steel A, vanadium content of 0.1 mass% in Steel B, vanadium content of 0.27 mass% in Steel C, and vanadium content of 0.1 mass% with the addition of 0.02 mass% N in Steel D. The dissolution of vanadium and precipitation of vanadium carbides, nitrides, or carbonitrides and the effect of vanadium microalloying on the fraction and morphology of deformation-induced pearlite for different magnitudes of strain were examined, and the mechanism of the effect was elucidated. The results revealed that DIPT could be significantly improved by vanadium microalloying with the addition of N but decreased and postponed without the addition of N because vanadium nitrides or carbonitrides were precipitated in austenite under a small strain and facilitated the nucleation of pearlite both along the boundary of austenite grain (AG pearlite) and intragranular (IG pearlite). Moreover, transformation kinetics of DIPT was fitted and compared. The results further revealed that the rate of DIPT in vanadium-microalloyed steel with the addition of N was twice as fast as that in the vanadium-free steel. In order to ensure the complete spheroidization of lamellar cementites in vanadium-microalloyed steel, a comparison of the morphology of cementites revealed that a greater magnitude of strain was required. View Full-Text
Keywords: eutectoid steel; vanadium microalloying; deformation-induced pearlite transformation (DIPT); spheroidization eutectoid steel; vanadium microalloying; deformation-induced pearlite transformation (DIPT); spheroidization
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Cai, Z.; Mao, X.; Bao, S.; Zhao, G.; Xu, Y. Influence of Vanadium Microalloying on Deformation-Induced Pearlite Transformation of Eutectoid Steel. Metals 2019, 9, 268.

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