Impact of thermochemical treatment on structure and phase state of austenitic alloy

Natalya Popova, Elena Nikonenko, Gulnara Erbolatova, Mark Kalashnikov, Alisa Nikonenko

Результат исследований: Материалы для книги/типы отчетовМатериалы для конференции

Аннотация

The paper presents the transmission electron microscope (TEM) investigations of the structure and phase composition of 0.4C-1Cr-1Ni-1Al austenite steel alloy before and after electrolytic plasma treatment or carbonitriding. Electrolytic plasma treatment is performed in an aqueous solution at 700° for 5 min. The phase composition of the alloy, its size, volume fraction and localization are determined for carbide and carbonitride phases. The type of the dislocation substructures is determined for each phase composition, and the scalar dislocation density is measured. It is shown that before the electrolytic plasma treatment, the alloy matrix is Al0.7Cr0.3Ni3 FCC phase which represents grains with different size. There are fine grains along the boundaries together with coarse grains. Experiments show that particles of other phases are observed inside coarse grains of Al0.7Cr0.3Ni3 phase, namely: 1) NiAl lamellar particles (BCC phase) and 2) AlCrNi2 rounded particles (FCC phase). Moreover, NiAl and AlCrNi2 phases are present either in separately positioned groups or groups of single-phase grains, along the boundaries of which there are Cr23C6 carbide phase particles. Al0.7Cr0.3Ni3, AlCrNi2 and NiAl phases are found in the specimen subsurface both before and after carbonitriding. The alloy matrix is still Al0.7Cr0.3Ni3 phase. However, carbonitriding causes partial delamination of Al0.7Cr0.3Ni3 and AlCrNi2 solid solutions, which is evidenced by the deterioration (satellites and strands of the main reflections) of their diffraction patterns and a salt/pepper contrast presenting on TEM images. The formation of nanoscale Cr2N particles occurs inside Al0.7Cr0.3Ni3 grains.

Язык оригиналаАнглийский
Название основной публикацииProceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019
РедакторыVictor E. Panin, Sergey G. Psakhie, Vasily M. Fomin
ИздательAmerican Institute of Physics Inc.
ISBN (электронное издание)9780735419124
DOI
СостояниеОпубликовано - 19 ноя 2019
Опубликовано для внешнего пользованияДа
СобытиеInternational Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019 - Tomsk, Российская Федерация
Продолжительность: 1 окт 20195 окт 2019

Серия публикаций

НазваниеAIP Conference Proceedings
Том2167
ISSN (печатное издание)0094-243X
ISSN (электронное издание)1551-7616

Конференция

КонференцияInternational Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019
СтранаРоссийская Федерация
ГородTomsk
Период1.10.195.10.19

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Цитировать

    Popova, N., Nikonenko, E., Erbolatova, G., Kalashnikov, M., & Nikonenko, A. (2019). Impact of thermochemical treatment on structure and phase state of austenitic alloy. В V. E. Panin, S. G. Psakhie, & V. M. Fomin (Ред.), Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019 [020287] (AIP Conference Proceedings; Том 2167). American Institute of Physics Inc.. https://doi.org/10.1063/1.5132154