Phase Transformations in a Precision 40KhNYu-VI Nickel Alloy during Heat Treatment and Nitriding

Vintaikin, B. E.; Kamynin, A. V.; Смирнов, А. Е.; Cherenkova, S. A.

doi:10.1134/s0036029519070140

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…The thickness of the internal nitriding zone (formation of disperse nitrides) was determined by metallography (see Fig. 2) and refined by the durometric method from a slight decrease in the microhardness [16,17]. A quite satisfactory coincidence is observed for the experimentally found time dependence of the size of the internal nitriding region and the dependence calculated by the mathematical model (see Fig.…”

Section: C X Cmentioning

confidence: 67%

“…An analysis of the XRD patterns (Fig. 1) shows that the nitriding of the preliminarily calcined and aged chromium-nickel alloy results in the decomposition of Ni 3 Al intermetallic particles and the formation of AlN and CrN nitrides [16].…”

Section: Resultsmentioning

confidence: 99%

“…2, region 2) with the microhardness not lower than 670 HV 0.1 , and core (Fig. 2, region 3) that underwent no nitriding and retained intermetallic hardening (microhardness 720-740 HV 0.1 ) [16,17].…”

Section: Resultsmentioning

confidence: 99%

“…The formation of nitrides is preceded by the dissolution of atomic nitrogen, which was formed due to the dissociation of molecular nitrogen in glow discharge, in γ-Ni alloyed by chromium and aluminum. It was found [16,17] that the Ni 3 Al intermetallic particles present in the alloy decomposed during the precipitation of chromium and aluminum nitride particles from the solid solution via the internal nitriding mechanism. The continuous nitride crust formed on the surface via the external nitriding mechanism and containing traces of nickel consists predominantly of CrN, which is formed due to the diffusion redistribution of chromium from γ-Ni (see Fig.…”

Section: Resultsmentioning

confidence: 99%

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Modeling of the Nitrogen Saturation of the Alloys Based on Nickel and Chromium in a Glow Discharge

et al. 2021

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The chemical and phase compositions and the surface layer structure of a chromium-and aluminum-alloyed nickel-based alloy after quenching, aging, and nitriding in a glow discharge are determined using the results of X-ray diffraction, metallographic, and electron microscopic studies. The sequence of the transformations that occur during nitriding in the precipitation hardening alloy is found on the basis of the data obtained. Boundary conditions for mathematical models of the external (with the formation of a continuous surface layer of nitrides) and internal (when disperse nitride particles form in the diffusion layer) nitriding are developed. A comparison with the experimental data shows the adequacy of the proposed mathematical models.

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Section: C X Cmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Modeling of the Nitrogen Saturation of the Alloys Based on Nickel and Chromium in a Glow Discharge

et al. 2021

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The Peculiarities of the Structure of the Ni–40Cr–3.5Al Alloy during Nitriding

Vintaikin

Смирнов²,

Shevchenko³

et al. 2022

Phys. Metals Metallogr.

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Phase Composition and Structure of the BrX Chromium Bronze Powder

et al. 2023

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Methods of the X-ray phase analysis, as well as optical and scanning electron microscopy supplemented by construction of the distribution maps for such chemical elements as oxygen and copper demonstrated presence in the structure of the PR-BrX brand powder made of bronze with the FСС lattice of oxygen-containing phases, i.e., copper oxides (CuO, Cu2O) located along the grain boundaries and on the powder particle surface. Using these methods demonstrated that annealing in the ammonia at a temperature of 450 °C promoted reduction of the oxide phases to the single-phase structure of the initial solid solution. It was found out that the presence of oxides on the powder particles surface and grain boundaries inside these particles made the oxidized powder unsuitable for use in the selective laser melting technology. This is due to reduction of the oxides, and, consequently, to the outgassing and excessive porosity of objects during the laser 3D printing. It was proved that reductive annealing in ammonia formed a single-phase structure of powder particles based on the FCC copper, which made it possible to grow objects with small porosity not exceeding 2.5 % using various laser processing modes

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Phase Transformations in a Precision 40KhNYu-VI Nickel Alloy during Heat Treatment and Nitriding

Cited by 3 publications

References 6 publications

Modeling of the Nitrogen Saturation of the Alloys Based on Nickel and Chromium in a Glow Discharge

Modeling of the Nitrogen Saturation of the Alloys Based on Nickel and Chromium in a Glow Discharge

The Peculiarities of the Structure of the Ni–40Cr–3.5Al Alloy during Nitriding

Phase Composition and Structure of the BrX Chromium Bronze Powder

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