Phase composition of perlite steel modified by electrolyte plasma nitriding

Попова, Н. А.; Erygina, Lyudmila; Никоненко, Е. Л.; Skakov, Маzhyn

doi:10.1063/1.5009847

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“…The volume fraction of this structure in the material is 20%. The average value of the scalar dislocation density inside fragments of the α-phase is 2.95 × 10 10 cm −2 [29][30][31]. The ferrite-carbide mixture is the second morphological component of the structure of 0.34Cr-1Ni-Mo-Fe steel in the initial state (Figure 3c).…”

Section: Resultsmentioning

confidence: 96%

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Change of 0.34Cr-1Ni-Mo-Fe Steel Dislocation Structure in Plasma Electrolyte Hardening

et al. 2021

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This work deals with the study of changes in the dislocation structure and quantitative characteristics, as well as morphological components, of 0.34Cr-1Ni-Mo-Fe steel before and after plasma electrolytic hardening. According to the electron microscopic studies of the fine structure of 0.34Cr-1Ni-Mo-Fe steel before and after plasma electrolytic hardening, 0.34Cr-1Ni-Mo-Fe steel is a multiphase material containing an α-phase, a γ-phase (retained austenite), and a cementite and carbide phase. It was revealed that, morphologically, the α-phase in the initial state, generally, is present in the form of: lamellar pearlite with a volume fraction of 35%, a ferritocarbide mixture with a volume fraction of 45%, and fragmented ferrite with a volume fraction of 20% of the material. After surface hardening, the morphological components of the structure changed: packet–lamellar martensite with volume fractions of 60% and 40%, 5% and 7% of γ-phase as residual austenite in the crystals of packet–lamellar martensite, 0.6% and 1.5% of cementite in crystals of packet–lamellar martensite, and 0.15% and 0.35% of complex carbide М23С6 in crystals of packet–lamellar martensite, respectively, were observed. The quantitative characteristics of the dislocation structure were estimated by the following calculated indices of packet and lamellar martensite: scalar (ρ) and excess (ρ±) density of dislocations, the value of the curvature-torsion of the crystal lattice (χ), the amplitude of long-range internal stresses (σd), and the amplitude of shear stresses (σL), according to which the plastic nature of the bending-torsion of the crystal lattice was confirmed (σL > σd).

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Section: Resultsmentioning

confidence: 96%

“…The volume fraction of this structure in the material is 20%. The average value of the scalar dislocation density inside fragments of the α-phase is 2.95 × 10 10 cm −2 [ 29 , 30 , 31 ].…”

Section: Resultsmentioning

confidence: 99%