Low-Temperature Deformation and Fracture of Cr-Mn-N Stainless Steel: Tensile and Impact Bending Tests; Metals; Vol. 13, iss. 1

Low-Temperature Deformation and Fracture of Cr-Mn-N Stainless Steel: Tensile and Impact Bending Tests; Metals; Vol. 13, iss. 1

Bibliografiska uppgifter
Parent link:Metals.— .— Basel: MDPI AG
Vol. 13, iss. 1.— 2023.— Article number 95, 14 p.
Övriga upphovsmän: Narkevich N. A. Nataljya Arkadjevna, Vlasov I. V. Iljya Viktorovich, Volochaev M. N. Mikhail Nikolaevich, Gomorova Yu. F. Yuliya Fedorovna, Mironov Yu. P. Yury Petrovich, Panin A. V. Alexey Viktorovich, Berto F. Filippo, Maksimov P. V. Pavel Vasiljevich, Deryugin E. E. Evgeny Evgenjevich
Sammanfattning:Title screen
The paper presents the results of tensile and impact bending tests of 17%Cr-19%Mn-0.53%N high-nitrogen austenitic stainless steel in temperatures ranging from −196 to 20 °C. The steel microstructure and fracture surfaces were investigated using transmission and scanning electron microscopes, as well as X-ray diffraction analysis. The steel experiences a ductile-to-brittle transition (DBT); however, it possessed high tensile and impact strength characteristics, as well as the ductile fracture behavior at temperatures down to −114 °C. The correspondence between γ–ε microstructure and fracture surface morphologies was revealed after the tensile test at the temperature of −196 °C. In this case, the transgranular brittle and layered fracture surface was induced by ε-martensite formation. Under the impact bending test at −196 °C, the brittle intergranular fracture occurred at the elastic deflection stage without significant plastic strains, which preceded a failure due to the high internal stresses localized at the boundaries of the austenite grains. The stresses were induced by: (i) segregation of nitrogen atoms at the grain boundaries and in the near-boundary regions, (ii) quenching stresses, and (iii) reducing fcc lattice volume with the test temperature decrease and incorporation of nitrogen atoms into fcc austenite lattice. Anisotropy of residual stresses was revealed. This was manifested in the localization of elastic deformations of the fcc lattice and, consequently, the stress localization in <100>-oriented grains; this is suggested to be the reason of brittle cleavage fracture
Текстовый файл
Språk:engelska
Publicerad: 2023
Ämnen:
high-nitrogen steel
austenite; tensile test
impact bending test
ductile-to-brittle transition
internal stresses
fracture
электронный ресурс
труды учёных ТПУ
Länkar:https://doi.org/10.3390/met13010095
Materialtyp: Elektronisk Bokavsnitt
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=685541

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