Austempering in low-C steels: microstructure development and nanohardness characterization

The development of multiphase steels to obtain an optimum balance between strength and ductility is a very active topic of research. In particular, carbide-free bainitic steels have shown promising mechanical properties, making them good candidates for replacing well-established first-generation ste...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials science 2019-03, Vol.54 (6), p.5044-5060
Main Authors: Taboada, M. C., Elizalde, M. R., Jorge-Badiola, D.
Format: Article
Language:English
Subjects:
Austempering
Automobile industry
Automotive engineering
Automotive industry
Carbides
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Hardness (Materials)
Materials Science
Mechanical properties
Metals
Nanohardness
Nanoindentation
Overaging
Polymer Sciences
Silicon steels
Solid Mechanics
Structural steels
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The development of multiphase steels to obtain an optimum balance between strength and ductility is a very active topic of research. In particular, carbide-free bainitic steels have shown promising mechanical properties, making them good candidates for replacing well-established first-generation steels in the automotive industry. In this work, a detailed analysis of the microstructures attainable through overaging treatments is tackled in two bainitic steels with different Si contents. The focus has been put onto the mechanical characterization, via nanoindentation, of the phases that are generated as a consequence of the change in the bainitic treatment conditions and the final cooling to room temperature. The results show the suitability of the nanoindentation technique for gaining knowledge about the underlying transformation-related phenomena and for measuring the relative difference in hardness of the various micro-constituents. The latter is a key factor in understanding the origin of the damage in this kind of steels.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-018-3159-6