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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 11/2022

14-06-2022 | Technical Article

Evolution during Hot Rolling and Control by Thermomechanical Control Process of Surface Decarburization on 38Si7 Spring Steel

Authors: Jiaxing Liu, Bo Jiang, Chaolei Zhang, Guizhi Li, Yonggang Dai, Lie Chen

Published in: Journal of Materials Engineering and Performance | Issue 11/2022

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Abstract

The evolution of the decarburization layer on 38Si7 spring steel for railway spring clips during a hot rolling process was studied, and the surface decarburization behavior was investigated by isothermal heating experiments. Then, a thermomechanical control process was performed to reduce complete decarburization on the wire rod. These results show that a complete decarburization layer was produced between 650 and 875 °C, and the maximum depth was found at 825 °C. Moreover, it was determined that finishing temperature and cooling rate after rolling have an important influence on decarburization. Complete decarburization on wire rod consisted of the decarburization formed during the finishing rolling process and the inherited decarburization from an intermediate slab. With the increased finishing rolling temperature and cooling rate, the inherited decarburization from intermediate slab on wire rod accounted for 74% of the total decarburization. In addition, oxygen concentration could influence Cs (the surface carbon concentration balanced with atmosphere) and then complete decarburization was suppressed. For the 38Si7 spring steel for railway spring clips, the completed decarburization process can be greatly reduced during the hot-rolling process and subsequent cooling process.
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Metadata
Title
Evolution during Hot Rolling and Control by Thermomechanical Control Process of Surface Decarburization on 38Si7 Spring Steel
Authors
Jiaxing Liu
Bo Jiang
Chaolei Zhang
Guizhi Li
Yonggang Dai
Lie Chen
Publication date
14-06-2022
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 11/2022
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-022-06956-5

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