Журналы →  CIS Iron and Steel Review →  2016 →  №1 →  Назад

Название Influence of nitrogen and copper on hardening of austenitic chromium-nickelmanganese stainless steel
DOI 10.17580/cisisr.2016.01.05
Автор L. M. Kaputkina, A. G. Svyazhin, I. V. Smarygina, V. E. Kindop
Информация об авторе

National University of Science and Technology “MISIS”, Moscow, Russia:

L. M. Kaputkina, Dr. Phys.-Math., Prof., Chief Researcher, e-mail: kaputkina@mail.ru
A. N. Svyazhin, Dr. Eng., Prof., Chief Researcher, e-mail: svyazhin@misis.ru
I. V. Smarygina, Cand. Eng., Associate Prof., e-mail: smarygina.inga@yandex.ru
V. E. Kindop, Cand. Eng., Deputy Head of Science Department, e-mail: vk@misis.ru

Реферат

Alloying by nitrogen has a strong effect on the whole complex of steel properties. Joint alloying by nitrogen and copper increases apparently austenite stability and decreases the beginning temperature of martensite transformation. The steels alloyed by copper and nitrogen also elevate their resistance to pitting and microbiological corrosion. The conducted investigation was based on laboratorial steel melting with pure charge materials. Mechanical properties have been determined during testings for single-axial static extension at the temperature values +100 °C, +20 °C, –100 °C, –175 °C, and for impact bending at the temperature values +100 °C, +20 °C, –100 °C, –196 °C. Presence of ferromagnetic phase has been defined after testings via magnetometrical method. Equilibrium phase diagrams of the investigated steels have been calculated using Thermo-Calc program, critical nitrogen concentration values NKP excluding forming of nitrogen bubbles during crystallization have been determined, as well as temperature values MH, MD30 of the beginning of martensite transformation and parameter of pitting corrosion resistance (PREN). The results of testings at different temperatures have been visualized and analyzed in the kinds of deformation diagrams, non-magnetic properties, low temperatures of the beginning of martensite transformation MH, MD30. It is concluded based on these results that austenite of steels Cr19Mn10Ni6Mo2N is stable in thermal and deformation conditions at rather high deformation degree. Additional alloying by copper (up to 2%) of nitrogen steel Cr19Mn10Ni6Mo2N has a small effect on its mechanical properties, but increases its austenite stability (via lowering of the temperatures of the beginning of martensite transformation MH, MD30), eliminates forming of δ-ferrite in crystallization and rises pitting corrosion resistance, increasing PREN parameter. Austenite of classic stainless steels Cr18Ni9N and Cr18Nihas insufficient mechanical stability at negative temperatures, thereby these steels can be used for non-deformed products at the temperatures below –70 °C, because forming of deformation martensite in these steels is possible.

The research was financially supported by the RF Ministry of education and science (unique agreement identification RFMEFI57514X0071).

Ключевые слова Austenitic stainless steels, alloying by nitrogen and copper, treatment, thermal stability, structure, mechanical properties, martensite transformation, ferromagnetic phase, pitting corrosion resistance
Библиографический список

1. Pulkkinen H., Apajalahti H., Papula C., Talonen J., Hänninen H. Steel Research International. 2014. Vol. 85(3). pp. 324–335.
2. Kaputkina L.M., Smarygina I.V., Kaputkin D.E., Svya zhin A. G., Bobkov T. V. Metal Science and Heat Treatment. 2015. Vol. 57(7). pp. 395–401.
3. Mushnikova S. Yu., Kostina M. V., Andreev Ch. A., Zhekova L. Ts. Metally = Metals. 2009. № 1. pp. 36–41.
4. Jargelius-Pettersson R. F. A. Corrosion. 1998. Vol. 54(2). pp. 162–168.
5. Birman S. R. Ekonomnolegirovannye martensitostareyushchie stali (Economically alloyed martensite-ageing steels). Мoscow : Metallurgiya = Metallurgy. 1974. 208 p.
6. Pickering F. B. Physical Metallurgy and the Design of Steels. London: Applied Science Publisher Ltd. 1978. 104 p.
7. Fudanoki F., Oomura K. Ferrum. 2014.Vol. 19(8). pp. 535–542.
8. Nizhegorodov S. Yu., Voloskov S. A., Trusov V. A., Kaputkina L. M., Syur T.A. Corrosion of Steels due to the Action of Microorganisms. Metal Science and Heat Treatment. 2008. v. 50 (3–4). pp. 191–195.
9. Yoshihiro S. Biofilms and Antibacterial Effects of Metals. Ferrum. 2007. Vol. 12 (10). pp. 639–643.
10. Udod К. А., Rodionova I. G., Knyazev A. V., Stukalin S. V. Issledovanie vliyaniya khimicheskogo sostava i termicheskoy obrabotki na pokazateli korrozionnoy stoikosti nerzhaveyushchikh staley martensitnogo klassa, legirovannykh azotom (Research of influence of chemical composition and heat treatment on parameters of corrosion resistance of nitrogen-alloyed stainless steels of martensite class). Metallurg = Metallurgist. 2015. № 11. pp. 93–96.
11. Shlyamnev A. P., Novichkova O. V., Pisarevskiy L. A. Azotsoderzhashchie nerzhaveyushchie stali – perspektivnyi material dlya proizvodstva serovodorodostoikikh trub (Nitrogen-containing stainless steels as prospective material for production of hydrogen sulfide resistant tubes). Problemy chernoy metallurgii i materailovedeniya = Problems of iron and steel industry and material science. 2010. № 1. pp. 57–59.
12. Gavriljuk V. G., Foct J., Petrov Yu. N., Polushkin Yu. A. Effect of Nitrogen on the Temperature Dependence of the Yield Strength of Austenitic Steels. Acta Materialia. 1998. Vol. 46 (4). pp. 1157–1163.
13. Mosecker L., Pierce D. T., Schwedt A., Beighmohamadi M., Mayer J., Bleck W., Wittig J. E. Temperature Effect on Deformation Mechanisms and Mechanical Properties of a High Manganese C+N Alloyed Austenitic Stainless Steel. Materials Science and Engineering: A. 2015.Vol. 642. pp. 71–83.
14. Hamada A. S., Karjalainen L. P., Misra R. D. K., Talonen J. Contribution of Deformation Mechanisms to Strength and Ductility in Two Cr–Mn Grade Austenitic Stainless Steels. Materials Science and Engineering: A. 2013.Vol. 559. pp. 336–344.
15. Svyazhin A. G., Bazhenov V. E., Kaputkina L. M., Siwka J., Kindop V. E. Critical Nitrogen Concentration in High-Nitrogen Steels for the Production of a Dense Ingot. Metallurg = Metallurgist. 2015. Vol. 58 (11–12). pp. 959–966.

Полный текст статьи Influence of nitrogen and copper on hardening of austenitic chromium-nickelmanganese stainless steel
Назад