Affiliation:
1. New technologies of metallic and ceramic materials laboratory, A.A. Baikov Institute of metallurgy and materials science of Russian academy of sciences
Abstract
The quantitative microstructure - impact toughness relationships in two batches of the same steel grade subjected to quenching and tempering (Q&T) have been established via characterization using EBSD technique and FIB visualization. The EBSD-based criterion for separation of structural constituents in microstructure of Q&T low carbon low alloy steels is proposed. Impact toughness differences between two steel batches subjected to nominally identical Q&T are caused by the changes in the volume fraction of structural constituents caused by various cooling conditions at quenching stage. High volume fraction of bainite containing more distorted bainitic ferrite and the highest amount of brittle cementite precipitates leads to the increase in strength and to the decrease in impact toughness.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Reference16 articles.
1. P.A. Revel-Muroz, E.G. Ilyin, A.N. Chentsov, M.M. Kantor, V.A. Bozhenov, A.M. Arsenkin, Reliability of oil storage tanks used in the zapolyare-purpe pipeline system (in russian), Sci. & technol.: oil and oil products pipeline transportation. 2 (2012) 14-21.
2. M.M. Kantor, V.A. Bozhenov, Scattering of values of impact toughness of low-alloy steel in the ductile-brittle transition temperature region, Inorg, Mat.: Appl.Res. 5 (2014) 293-302.
3. A.V. Rudchenko, Steels for heat-treated electric-welded gas and oil pipes. (in russian), Met. Sci. & Heat. Treat. 7 (1977) 51-53.
4. T. Araki, K. Shibata, M. Enomoto, Reviewed concept on the microstructural identification and terminology of low carbon ferrous bainites, Mat. Sci. For. 56-58 (1990) 225-280.
5. T. Araki, M. Enomoto, K. Shibata, Microstructural Aspects of Bainitic and Bainitic-like Ferritic Structures of Continuously Cooled Low Carbon (<0,3%) HSLA, Mat. Trans. JIM. 32 (1991) 729-736.