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Low-temperature deformation and fracture of Cr-Mn-N stainless steel: Tensile and impact bending tests / N. Narkevich, I. Vlasov, M. Volochaev [et al.] // Metals. - 2023. - Vol. 13, Is. 1. - Ст. 95, DOI 10.3390/met13010095. - Cited References: 41. - The research was funded by RSF, project No. 22-29-00438. The low-temperature tensile tests were carried out in accordance with the state assignment for the ISPMS SB RAS, project No. FWRW-2021-0009 . - ISSN 2075-4701
Кл.слова (ненормированные):
high-nitrogen steel -- austenite -- tensile test -- impact bending test -- ductile-to-brittle transition -- internal stresses -- fracture
Аннотация: 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.

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Держатели документа:
Laboratory of Physical Mesomechanics of Materials and Non-Destructive Testing, Institute of Strength Physics and Materials Science SB RAS, Tomsk, 634055, Russian Federation
Kirensky Institute of Physics SB RAS, Krasnoyarsk, 660036, Russian Federation
Laboratory of Shape Memory Alloys, Institute of Strength Physics and Materials Science SB RAS, Tomsk, 634055, Russian Federation
School of Advanced Manufacturing Technologies, National Research Tomsk Polytechnic University, Tomsk, 634030, Russian Federation
Department of Mechanical and Aerospace Engineering, SAPIENZA-Universita Di Roma, Roma, 00184, Italy

Доп.точки доступа:
Narkevich, N.; Vlasov, I.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Gomorova, Y.; Mironov, Y.; Panin, S.; Berto, F.; Maksimov, P.; Deryugin, E.
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