Phase transformations in 0.34С–1Cr–1Ni–1Mo–Fe steel under the action of electrolytic plasma nitrocarburizing

Попова, Н. А.; Erygina, Lyudmila; Никоненко, Е. Л.; Skakov, Маzhyn; Конева, Н. А.; Козлов, Э. В.

doi:10.3103/s1062873817030297

Cited by 8 publications

(2 citation statements)

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“…In order to detect structural and phase changes in the surface layer of 0.34 C-1Cr-1Ni-1Mo-Fe steel at PEH TEM studies were performed. As shown in earlier studies [25,26], in the initial state, the structure of 0.34C-1Cr-1Ni-1Mo-Fe steel is: (1) lamellar pearlite, (2) ferrite-carbide mixture, and (3) fragmented ferrite. Lamellar perlite is present in almost perfect and fragmented forms.…”

Section: Resultsmentioning

confidence: 53%

Structural-phase transformations in 0.34C–1CRr–1Ni–1Mo–Fe steel during plasma electrolytic hardening

Rakhadilov

Kozhanova²,

Попова

et al. 2020

Materials Science-Poland

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Structural-phase transformations in 0.34C–1Cr–1Ni–1Mo–Fe steel during plasma electrolytic hardening were investigated. Electrolytic-plasma hardening of steel samples was carried out by surface quenching with rapid concentrated heating of the surface by plasma action and subsequent rapid cooling by heat removal from the depth of the sample by electrolyte jet. Plasma electrolytic hardening was carried out in the cathode mode in an electrolyte made from an aqueous solution containing 20 % sodium carbonate and 10 % carbamide. To study the structural-phase states of the modified layer, we used the method of transmission diffraction electron microscopy on thin foils. The study of steel samples was carried out before and after the plasma electrolytic hardening. Initially, the steel was a mixture of pearlite and ferrite grains. Surface hardening of 0.34C–1Cr–1Ni–1Mo–Fe ferrite-pearlite steel led to a change in the structural-phase state and the formation of a packet-lamellar martensite structure. It was found that PEH leads to distortion of the crystal lattice and the formation of long-range internal stresses, as well as to the release of small particles of cementite and carbide of M23C6 type, uniformly distributed throughout the volume of the material. Surface hardening led to the increase in all quantitative parameters of the fine structure (ρ, ρ ±, χ, σL, σd).

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Section: Resultsmentioning

confidence: 53%

Structural-phase transformations in 0.34C–1CRr–1Ni–1Mo–Fe steel during plasma electrolytic hardening

Rakhadilov

Kozhanova²,

Попова

et al. 2020

Materials Science-Poland

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“…Structural phase composition of the type 0.34C-1Cr-1Ni-1Mo-Fe steel was previously described in details in [18]. It was established that the structure of steel in the original state was first, lamellar pearlite, with its volume fraction comprising 35% of the volume of material matrix.…”

Section: Structure and Phase Composition Of Steel In The Original Statementioning

confidence: 99%

Influence of electrolytic plasma nitriding mode on structural phase state of pearlitic steel

et al. 2018

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Abstract. The paper describes results of studies of phase transitions in structural phase state occurring in the type 0.34C-1Cr-1Ni-1Mo-Fe steel under electrolytic plasma nitriding in nitrogen-containing water solution. The nitriding voltages considered in the given study were 550 and 600 V. The research was conducted by means of X-ray diffraction electron microscopy. The specimens were studied in two states : 1) before modification (original state) and 2) after nitriding in the surface layer of the specimen. The study was conducted on thin foils. It was found that nitriding lead to significant changes in the structure of steel, namely in its phase composition and in the number of existing phases. In the original state the structure of steel was given as lamellar pearlite, ferritic carbide mix and fragmented ferrite. After 550 V nitriding it was lath martensite, plates of -phase, with colonies of thin parallel plates of -phase and coarse grains of -phase, containing -phase grains which were different in size and shape and were various-directional. Increase in nitriding voltage up to 600 V lead to change in the structure given as a lamellar nonfragmented pearlite and fragmented ferrite. The original state was marked by presence of particles of М 3 С cementite, after nitriding irrespective of the voltage it had the particles of М 3 С alloyed cementite, Fe 3 Mo 3 N nitride and Cr 2 C 0.61 N 0.39 carbonitride. The sizes, volume fractions and locations of particles were dependent on nitriding voltage.

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Phase Composition and Thin Structure of Steel Surface after Plasma Electrolytic Carbonitriding

et al. 2020

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Phase transformations in 0.34С–1Cr–1Ni–1Mo–Fe steel under the action of electrolytic plasma nitrocarburizing

Cited by 8 publications

References 0 publications

Structural-phase transformations in 0.34C–1CRr–1Ni–1Mo–Fe steel during plasma electrolytic hardening

Structural-phase transformations in 0.34C–1CRr–1Ni–1Mo–Fe steel during plasma electrolytic hardening

Influence of electrolytic plasma nitriding mode on structural phase state of pearlitic steel

Phase Composition and Thin Structure of Steel Surface after Plasma Electrolytic Carbonitriding

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