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- Publisher
- Springer Journals
- Copyright
- Copyright © 2011 by University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg
- Subject
- Material Science; Materials Science, general; Metallic Materials; Characterization and Evaluation of Materials; Ceramics, Glass, Composites, Natural Methods; Surfaces and Interfaces, Thin Films; Tribology, Corrosion and Coatings
- ISSN
- 1674-4799
- eISSN
- 1869-103X
- DOI
- 10.1007/s12613-011-0475-0
- Publisher site
- See Article on Publisher Site
Abstract
Effects of silicon (Si) content on the stability of retained austenite and temper embrittlement of ultrahigh strength steels were investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM), and other experimental methods. The results show that Si can suppress temper embrittlement, improve temper resistance, and hinder the decomposition of retained austenite. Reversed austenite appears gradually with the increase of Si content during tempering. Si has a significant effect on enhancing carbon (C) partitioning and improving the stability of retained austenite. Si and C atoms are mutually exclusive in lath bainite, while they attract each other in austenite. ɛ-carbides are found in 1.8wt% Si steel tempered at 250°C, and they get coarsened obviously when tempered at 400°C, leading to temper embrittlement. Not ɛ-carbides but acicular or lath carbides lead to temper embrittlement in 0.4wt% Si steel, which can be inferred as cementites and composite compounds. Temper embrittlement is closely related to the decomposition of retained austenite and the formation of reversed austenite.
Journal
International Journal of Minerals, Metallurgy, and Materials – Springer Journals
Published: Oct 4, 2011