Effect of retained austenite on adhesion-dominated wear of nanostructured carbide-free bainitic steel

Sliding wear performance of carbide-free bainitic steel is significantly affected by microstructure. This investigation is an attempt to find a correlation between microstructure and wear resistance of carbide-free bainitic steel and compare the results with that of a conventional tempered martensit...

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Bibliographic Details
Published in:Tribology international 2020-10, Vol.150, p.106348, Article 106348
Main Authors: Moghaddam, P. Valizadeh, Hardell, J., Vuorinen, E., Prakash, B.
Format: Article
Language:English
Subjects:
Adhesive wear
Austempering
Bainite
Bainitic steel
Carbide-free
Carbides
Engineering Materials
Frictional wear
Machine Elements
Maskinelement
Materialteknik
Microstructure
Oxidation resistance
Retained austenite
Sliding friction
Wear
Wear resistance
Work hardening
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Summary:Sliding wear performance of carbide-free bainitic steel is significantly affected by microstructure. This investigation is an attempt to find a correlation between microstructure and wear resistance of carbide-free bainitic steel and compare the results with that of a conventional tempered martensitic microstructure. Under predominantly adhesive wear conditions, carbide-free bainitic microstructure with the highest amount of retained austenite offers the best wear resistance. This is mainly attributed to the more pronounced work hardening and TRIP-effect of carbide-free bainitic microstructure austempered at higher temperature. Therefore, higher initial bulk hardness is not the only indicator of wear resistance. Moreover, when both oxidation and adhesion are active, a microstructure with an optimum content of retained austenite and bainitic ferrite shows the highest wear resistance. •There is no general relationship between microstructure and sliding wear performance of carbide-free bainitic steels.•Higher retained austenite content is favourable under predominantly adhesive wear condition.•When both oxidation and adhesion are active, an optimum content of retained austenite and bainitic ferrite is desirable.•Higher initial hardness is not an only indicator of sliding wear resistance.•Work hardenability plays a crucial role under predominantly adhesive wear condition.
ISSN:0301-679X
1879-2464
1879-2464
DOI:10.1016/j.triboint.2020.106348