Effect of heat treatment on the structure and mechanical properties of 0.08%C–17.0%Cr–0.8%Ti steel after “internal” nitriding

Nikulin, S.; Рогачев, С. О.; Хаткевич, В. М.; Рожнов, А. Б.; Nechaykina, T.A.

doi:10.1016/j.jallcom.2013.02.162

Cited by 12 publications

(6 citation statements)

References 4 publications

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“…In this case, the substantial increase in the static and cyclic strength and high relative elongation at test temperatures of from room temperature to 700 ºС take place. However, the internal nitriding of steel products more than 0.5 mm in thickness is related to the substantial increase in the process time and nonuniform saturation of material with nitrogen [7]. In the present study, a method for the internal nitriding of 0.08C-17Cr-0.5Ti corrosion-resistant steel sheets more than 2.5 mm thick has been suggested.…”

Section: Introductionmentioning

confidence: 92%

“…The structure of a material subjected to internal nitriding contains disperse particles distributed over the entire volume of the material, which are thermodynamically stable nitrides of alloying elements and ensure the efficient hardening of the material [1][2][3][4]. The internal nitriding is successfully used to uniformly harden thin-wall products, over their volume, made from ferritic corrosion resistant steels [5][6][7][8]. In this case, the substantial increase in the static and cyclic strength and high relative elongation at test temperatures of from room temperature to 700 ºС take place.…”

Section: Introductionmentioning

confidence: 99%

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High-temperature internal nitriding of heavy-section steel products

Хаткевич

Nikulin

Рогачев

et al. 2017

J. Phys.: Conf. Ser.

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View the article online for updates and enhancements. Related contentNon-self-sustained low-pressure glow discharge for nitriding steels and alloys E V Ostroverkhov, V V Denisov, Yu A Denisova et al. A method for the internal nitriding of 0.08C-17Cr-0.5Ti corrosion-resistant steel sheets more than 2.5 mm thick has been suggested. The procedure includes the hightemperature nitriding of thin sheets, their hot pressing, and annealings. After such a treatment, the microhardness magnitude demonstrates the uniform distribution across the sheet section and reaches 280 HV. The formed structure of the material is characterized by a grain size of 0.5 µm and the presence of chromium-nitride particle precipitates. Compression tests showed that the prepared samples are deformed as a monolithic material; no cracks and laminations are formed on the surface.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

High-temperature internal nitriding of heavy-section steel products

Хаткевич

Nikulin

Рогачев

et al. 2017

J. Phys.: Conf. Ser.

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“…However, the solubility of nitrogen in austenitic molten steel is only approximately 0.4% at atmospheric pressure and approximately 0.08% in ferritic molten steel [ 9 ]. Common methods of the production of high-nitrogen stainless steel include [ 10 ] nitrogen pressure melting, powder metallurgy, surface nitriding, and high-temperature bulk nitriding [ 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Nitriding Behaviour and Microstructure of High-Nitrogen Stainless Steel during Selective Laser Melting

et al. 2023

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High-nitrogen stainless steels are widely used due to their excellent comprehensive performance. In this study, the effects of process parameters (laser power, scanning speed, and cavity pressure) on the formation of high-nitrogen stainless steels were studied by using conventional selective laser melting and high-pressure selective laser melting (HPSLM). The nitrogen content, nitrogen emission, phase composition, microstructure, and microhardness of the high-nitrogen stainless steel samples obtained through selective laser melting (SLM) were analysed by using an oxygen/nitrogen/hydrogen analyser, X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and electron backscatter diffraction. The results showed that the maximum nitrogen emission in the SLM sample was 0.175 wt.%, the emission rate reached up to 54.7%, and the maximum nitrogen content in the HPSLM sample was 1.07 wt.%. There was no significant difference between the phase peak positions of the SLM samples with different laser powers and the original powder. The main phase of the HPSLM sample changed at 0.3 MPa (from α-Fe to γ-Fe phase); the microstructure of the SLM sample was mainly composed of columnar and cellular crystals, and columnar crystal bands formed along the direction of heat flow. The HPSLM sample was mainly composed of equiaxed crystals with a grain size of 10–15 μm. At an energy density of 136 J/mm3, the microhardness and relative density reached their peak values of 409 HV and 98.85%, respectively.

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“…The mean size of the fragments is 47 ± 12 mm, which is much greater than the mean grain size (7 ± 2 mm). The cracks separating the fragments seem to pass either over grain boundaries or over the nitride plates with orientation within several grains [13]. At the macrolevel the specimens fracture by cleavage.…”

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confidence: 99%

Mechanical Properties and Fracture of Ferritic Corrosion-Resistant Steels After High-Temperature Nitriding

Хаткевич¹,

Nikulin²,

Рожнов³

et al. 2015

Met Sci Heat Treat

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The effect of high-temperature "internal" nitriding (at a temperature of 1075°C) and subsequent heat treatment on the mechanical properties and fracture behavior of thin-sheet specimens of ferritic corrosion-resistant steels 08Kh17T and 15Kh25T under static tension is studied. A thermochemical treatment providing effective uniform hardening of the whole of the volume of the material at enough ductility margin at testing temperatures from 20 to 700°C is suggested.A promising method for raising the properties of the whole of the volume of thin-walled steel articles is the process of volume "internal" nitriding in which the formation of a continuous layer of nitrides on the surface is suppressed [1,2]. The process yields fine particles of thermodynamically stable nitrides of the alloying elements distributed in the matrix and stabilizing the structure at high temperatures thus providing effective hardening of the steel [3 -7].The method of "internal" nitriding is used for hardening refractory metals and alloys and chromium-nickel austenitic steels [6,8,9]. The possibility of uniform strengthening of flat specimens from corrosion-resistant chromium steels 08Kh17T and 15Kh25T by the method of high-temperature "internal" nitriding and the main laws of structure formation in such steels under "internal" nitriding have been considered in [10 -13]. It has been shown that the fatigue resistance of the steels is elevated simultaneously with the characteristics of static strength [14].The aim of the present work was to study the effect of high-temperature "internal" nitriding on the mechanical properties and fracture behavior of thin-sheet specimens of steels 08Kh17T and 15Kh25T under static tension. METHODS OF STUDYWe studied flat specimens of steels 08Kh17T and 15Kh25T cut from sheets with a thickness of 0.5 mm. The chemical compositions of the steels determined with the help of a Q4 TASMAN optical emission spectrometer are presented in Table 1.We performed "internal" nitriding in a quartz reactor in a medium of pure nitrogen at 1075°C. The subsequent heat treatment was conducted in vacuum. The steels were studied in the initial recrystallized condition and after different variants of thermochemical treatment. After the nitriding the specimens were weighed with the help of a GR-200 high-accuracy balance. The content of nitrogen in the chosen samples was determined using a TC-600 Leco analyzer by the method of reduction melting in a graphite crucible in a flow of carrier gas (helium) in a resistance furnace. The gain in the weight of the specimens after the nitriding corresponded to the mass fraction of nitrogen dissolved in the metal. Depending on the duration of the saturation (1 -4 h) it ranged from 0.50 to 0.70% for steel 08Kh17T and from 0.90 to 1.80% for steel 15Kh25T. Before the nitriding the steels contained less than 0.02 wt.% nitrogen.The mechanical properties of the steels were determined under static tension at a temperature of 20 and 700°C using a

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Effect of heat treatment on the structure and mechanical properties of 0.08%C–17.0%Cr–0.8%Ti steel after “internal” nitriding

Cited by 12 publications

References 4 publications

High-temperature internal nitriding of heavy-section steel products

High-temperature internal nitriding of heavy-section steel products

Nitriding Behaviour and Microstructure of High-Nitrogen Stainless Steel during Selective Laser Melting

Mechanical Properties and Fracture of Ferritic Corrosion-Resistant Steels After High-Temperature Nitriding

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