Structure and specific features of strain hardening upon extension of a hot-rolled nitrogen-bearing austenitic–martensitic 27Kh15AN3MD2 steel
- Authors: Blinov V.M.1, Glezer A.M.2, Lukin E.N.1
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Affiliations:
- Baikov Institute of Metallurgy and Materials Science
- Bardin Central Research Institute for Iron and Steel Industry TsNIICHERMET
- Issue: Vol 2016, No 7 (2016)
- Pages: 607-612
- Section: Article
- URL: https://journals.rcsi.science/0036-0295/article/view/170648
- DOI: https://doi.org/10.1134/S0036029516070077
- ID: 170648
Cite item
Abstract
The microstructure and the static tensile stress–strain curve of a hot-rolled nitrogen-bearing austenitic–martensitic corrosion-resistant 27Kh15AN3MD2 steel have been studied. It is found that the curve has three straight line portions with different slopes at strains of 2–4.3% (portion I), 4.3–13.8% (portion II), and 13.8–19.5% (portion III). The intersection of the straight lines in portions I and II corresponds to the onset of the γ → α transformation at a strain of 4.3%. It is shown that strain-hardening coefficient dσ/dε of the steel in portion II is significantly larger than that in portions I and III. Insignificant twinning and fragmentation of martensite crystals are observed after extension by 2%. A 25% strain leads to significant twinning intensity, refinement, and an increase in the martensite content to 90%.
About the authors
V. M. Blinov
Baikov Institute of Metallurgy and Materials Science
Author for correspondence.
Email: flattop@yandex.ru
Russian Federation, Leninskii pr. 49, Moscow, 119991
A. M. Glezer
Bardin Central Research Institute for Iron and Steel Industry TsNIICHERMET
Email: flattop@yandex.ru
Russian Federation, Vtoraya Baumanskaya ul. 9/23, Moscow, 105005
E. N. Lukin
Baikov Institute of Metallurgy and Materials Science
Email: flattop@yandex.ru
Russian Federation, Leninskii pr. 49, Moscow, 119991