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Materials 2019, 12(2), 197; https://doi.org/10.3390/ma12020197

Morphology Study on Inclusion Modifications Using Mg–Ca Treatment in Resulfurized Special Steel

1,2
and
1,*
1
State Key Laboratory of Advanced Special Steel; Shanghai Key Laboratory of Advanced Ferrometallurgy; School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
2
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Received: 20 December 2018 / Revised: 1 January 2019 / Accepted: 3 January 2019 / Published: 9 January 2019
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Abstract

In resulfurized special steel, MnS and Al2O3 are two main inclusions that deteriorate fatigue life and machinability. It is important that these two inclusions should be well controlled to increase steel quality and usage performance. In the present study, a Mg–Ca treatment was employed to modify the MnS and Al2O3 inclusions in resulfurized steels to reduce detrimental effects on fatigue life and machinability. In the laboratory study, Ni–Mg alloy was added to 16MnCrS5 and 49MnVS3 steels. Both Al2O3 and CaO–Al2O3 were gradually modified to MgO·Al2O3 and MgO, being surrounded by MnS, that is, a complex inclusion with an oxide core and sulfide outer layer was formed. The amount of the complex inclusion increased with Mg content. In the hot forging experiment, non-Mg treated inclusions were in the morphology of long strip, while those with Mg treatment were seen to be less deformed with spherical morphology of low aspect ratio in which case inclusions had less effect on steel mechanical properties. The Mg–Ca treatment was also applied to the manufacture of resulfurized special steel in steel plants. The scanning electron microscope–energy dispersive spectrometer and statistical results agreed well with those in the laboratory studies. View Full-Text
Keywords: modification; MnS; Al2O3; inclusion; Mg–Ca treatment modification; MnS; Al2O3; inclusion; Mg–Ca treatment
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Shen, P.; Fu, J. Morphology Study on Inclusion Modifications Using Mg–Ca Treatment in Resulfurized Special Steel. Materials 2019, 12, 197.

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