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The role of grain size and ferrite substructure in respect to mechanical properties of an HSLA steel
Author(s) -
Österle Werner,
Cho ChonChoon
Publication year - 1986
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198600778
Subject(s) - substructure , ferrite (magnet) , pearlite , metallurgy , grain size , vanadium , materials science , chemistry , composite material , microstructure , structural engineering , austenite , engineering
Several heat treatments were applied to an HSLA steel of type StE 460 (German standard) to produce four ferrite substructures of different strength and at least two different grain sizes respectively. Whereas the ferrite substructure had a strong influence on yield strength the effect of grain size was negligible though probably to some extent masked by different pearlite volume fractions. The different strength levels could be explained by regarding the arrangement of dislocations and vanadium carbonitride particles and their mutual interaction. Increasing both grain size and pearlite volume fraction leads to a remarkable shift of transition temperature T 27 J which was further enhanced by increasing ferrite strength.