Journal
SCRIPTA MATERIALIA
Volume 61, Issue 6, Pages 604-607Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2009.05.035
Keywords
Cold working; Bainitic steel; Microstructure; Martensite; Mechanical properties
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Funding
- Tata Steel, Jamshedpur and Department of Science and Technology, New Delhi [SR/S3/ME/18/2005/SERC-Eng, SR/S5/NM-04/2005]
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We explore microstructural refinement through complete/partial recrystallization of prior cold-deformed ferrite during austenitizing or austempering of SAE 52100 steel to obtain ultrafine bainite and martensite. Optical and scanning/transmission electron microscopy coupled with compositional microanalysis were employed to determine the volume fraction and dimension (thickness/length) of ferritic sheaves and carbides. Characterization of mechanical properties indicates that 5-15% cold deformation significantly enhances the impact strength (similar to 72 J) with marginal improvement in hardness and tensile strength over that in the undeformed condition. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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