Effects of MnS Inclusions on the Banded Microstructure in Non-quenched and Tempered Steel

The effects of MnS inclusions in a non-quenched and tempered steel on banded ferrite/pearlite (F/P) microstructure have been studied in this investigation. The results show that the banded microstructure is mainly caused by fluctuations in the concentration of alloying elements such as Mn and Cr, wh...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2019-06, Vol.50 (3), p.1213-1224
Main Authors: Wang, Kai, Yu, Tao, Song, Yang, Li, Hong-xu, Liu, Meng-di, Luo, Rong, Zhang, Jing-yu, Fang, Fei-song, Lin, Xue-dong
Format: Article
Language:English
Subjects:
Alloying effects
Alloying elements
Banding
Characterization and Evaluation of Materials
Chemistry and Materials Science
CHROMIUM
CONCENTRATION RATIO
Diffusion effects
Dispersion
FERRITE
Ferrites
GRAIN SIZE
Heat treating
Inclusions
MANGANESE
MANGANESE SULFIDES
MATERIALS SCIENCE
Medium carbon steels
Metallic Materials
Microstructure
Nanotechnology
NUCLEATION
PEARLITE
PRECIPITATION
SPECTROSCOPY
STEELS
Structural Materials
Surfaces and Interfaces
TEMPERATURE RANGE 0400-1000 K
Thin Films
Variation
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Summary:The effects of MnS inclusions in a non-quenched and tempered steel on banded ferrite/pearlite (F/P) microstructure have been studied in this investigation. The results show that the banded microstructure is mainly caused by fluctuations in the concentration of alloying elements such as Mn and Cr, which were determined by energy dispersive spectroscopy. As a manganese-rich precipitate, MnS inclusions might produce extra effects on the banded microstructure and diffusion behavior of alloying elements depending on their size and distribution. Large-sized MnS inclusions distributed within pearlite bands retard the diffusion process of alloying elements, and accordingly, aggregate the degree of banding. On the contrary, small-sized MnS inclusions are much smaller than average grain size, which have little effects on the diffusion of alloying elements on a large scale, and they can promote the nucleation of ferrite and lead to a uniform distribution of ferrite and pearlite. An extended homogenization treatment at high temperatures can convert large-sized MnS inclusions into evenly dispersed smaller inclusions, and accordingly reduce the effect of MnS inclusions on the final microstructure.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-019-01532-0