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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationProceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019
EditorsVictor E. Panin, Sergey G. Psakhie, Vasily M. Fomin
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735419124
DOIs
Publication statusPublished - 19 Nov 2019
Externally publishedYes
EventInternational Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019 - Tomsk, Russian Federation
Duration: 1 Oct 20195 Oct 2019

Publication series

NameAIP Conference Proceedings
Volume2167
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceInternational Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019
CountryRussian Federation
CityTomsk
Period1.10.195.10.19

Fingerprint

carbides
electron microscopes
peppers
matrices
austenite
substructures
deterioration
strands
solid solutions
diffraction patterns
steels
scalars
aqueous solutions
salts
causes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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

Impact of thermochemical treatment on structure and phase state of austenitic alloy. / Popova, Natalya; Nikonenko, Elena; Erbolatova, Gulnara; Kalashnikov, Mark; Nikonenko, Alisa.

Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019. ed. / Victor E. Panin; Sergey G. Psakhie; Vasily M. Fomin. American Institute of Physics Inc., 2019. 020287 (AIP Conference Proceedings; Vol. 2167).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Popova, N, Nikonenko, E, Erbolatova, G, Kalashnikov, M & Nikonenko, A 2019, Impact of thermochemical treatment on structure and phase state of austenitic alloy. in VE Panin, SG Psakhie & VM Fomin (eds), Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019., 020287, AIP Conference Proceedings, vol. 2167, American Institute of Physics Inc., International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019, Tomsk, Russian Federation, 1.10.19. https://doi.org/10.1063/1.5132154
Popova N, Nikonenko E, Erbolatova G, Kalashnikov M, Nikonenko A. Impact of thermochemical treatment on structure and phase state of austenitic alloy. In Panin VE, Psakhie SG, Fomin VM, editors, Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019. American Institute of Physics Inc. 2019. 020287. (AIP Conference Proceedings). https://doi.org/10.1063/1.5132154
Popova, Natalya ; Nikonenko, Elena ; Erbolatova, Gulnara ; Kalashnikov, Mark ; Nikonenko, Alisa. / Impact of thermochemical treatment on structure and phase state of austenitic alloy. Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2019. editor / Victor E. Panin ; Sergey G. Psakhie ; Vasily M. Fomin. American Institute of Physics Inc., 2019. (AIP Conference Proceedings).
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