Plasma post oxidation of nitrocarburized hot work steel samples

Zlatanović, M.; Popović, N.; Bogdanov, Ž.; Zlatanovic, Sanja

doi:10.1016/j.surfcoat.2003.09.012

Cited by 26 publications

(7 citation statements)

References 6 publications

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“…The frictional behaviour is different for all the three tool steel materials, TS 1 and TS 2 show unsteady and higher friction values in the range of 0.9 to 1 whereas TS 3 shows steadier and lower friction values ranging from 0.7 to 0.8. The higher and more unsteady friction in case of TS 1 and TS 2 is caused by the presence of a different surface layer composition as seen from XRD analysis and it is known that the composition of the oxide layer is affected by the substrate [ 6 ]. TS 3, postoxidized at 500 °C (PO1), shows a lower friction coefficient in the beginning and at the end of the test compared to TS 1 and TS 2 with PO1.…”

Section: Resultsmentioning

confidence: 99%

“…Sun concluded that at higher post-oxidizing temperatures, a more porous and less adherent oxide film is formed, which leads to poor tribological behaviour. Zlatanović et al [ 6 ] investigated oxide films, created on salt bath nitrocarburized and plasma nitrocarburized steel samples, respectively. They found that a well adherent Fe 3 O 4 layer was formed on the nitrided samples whereas a Fe 2 O 3 layer was formed on an untreated reference sample, indicating that the substrate plays an important role in determining the final oxide composition.…”

Section: Introductionmentioning

confidence: 99%

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Tribological behaviour of surface-treated and post-oxidized tool steels at room temperature and 400 °C

Syed¹,

Hardell

Prakash³

2010

Estonian J. Eng.

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The primary focus of this investigation is on tribological properties of plasma nitrided and post-oxidized tool steels during sliding against ultra-high-strength boron steel. The experimental work has been carried out at room temperature and at 400 °C by using a high-temperature pin on disc tribometer. The experimental materials were tool steels of three different compositions, which were plasma nitrided and post-oxidized at 500 °C. One of the tool steels was also postoxidized at 480 and 520 °C. The results have shown that the friction and wear characteristics are influenced by the test temperature and the post-oxidizing temperature. The tool steel, post-oxidized at 500 °C, resulted in better friction and wear performance at room temperature and also improved wear resistance at elevated temperature. The observed wear mechanisms are mainly adhesive at room temperature and a combination of adhesive and abrasive at elevated temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tribological behaviour of surface-treated and post-oxidized tool steels at room temperature and 400 °C

Syed¹,

Hardell

Prakash³

2010

Estonian J. Eng.

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“…Figure 4a,b highlights the EBSD results for phase analysis of the microstructure for the surface hardened layer in the air and steam-specimens. In Figure 4a,b, the red, green, and yellow colors represent magnetite(Fe 3 O 4 ) with a face-centered cubic (FCC) structure, ε-phase(Fe 2-3 N) with a hexagonal close-packed (HCP) structure, and γ -phase(Fe 4 N) with FCC structure, respectively [14,15]. For the air-specimen, an oxide layer with a thickness of 2 µm covered the porous ε-phase, similar to the results shown in Figure 3.…”

Section: Microstructure and Phase Analysismentioning

confidence: 99%

Investigation of Microstructure, Nanohardness and Corrosion Resistance for Oxi-Nitrocarburized Low Carbon Steel

Cho

Kang

Baek

et al. 2019

Metals

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A role of oxi-nitrocarburizing technique for low-carbon steel was intensively evaluated as a means of reducing the problem of corrosion in gas nitrocarburizing, which is a vital disadvantage of gas nitrocarburizing. Oxi-nitrocarburizing was carried out by a two-step process: Gas nitrocarburizing at 560 °C and oxidation. In order to characterize two different methods of oxi-nitrocarburizing, oxidation was performed under two different conditions: Air and steam as oxygen sources. To analyze the microstructural, physical, and chemical properties of the thin oxide layer and nitride layer, which are the surface hardened layers formed on low-carbon steel by oxi-nitrocarburizing, several methods, such as electron probe microanalysis (EPMA), electron backscattered diffraction (EBSD), scanning electron microscopy (SEM), nanoindentation tests, and potentiodynamic polarization tests were applied. The results indicated that the EPMA and EBSD methods are powerful techniques for the analysis of microstructure, such as phase analysis and metallic element distribution in the oxide layer of magnetite and compound layer of ε-phase and γ'-phase, for oxi-nitrocarburized low-carbon steel. Additionally, the nanohardness using the nanoindentation test and corrosion resistance using the potentiodynamic polarization test for the oxi-nitrocarburized specimens are useful methods to understand the mechanical and corrosion properties of the surface hardened layer.

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“…The latter can be achieved through the formation of an inner compound layer consisting of ε-Fe 2−3 N, γ -Fe 4 N and other nitrides [2]; the former through an outer layer which should essentially contain magnetite, a very low content of hematite and probably FeO as well. The hematite phase layer is porous, brittle and a little adherent [3] while the magnetite one denser and more homogeneous so with a higher corrosion performance and a lower friction coefficient [4].…”

Section: Introductionmentioning

confidence: 99%

The Corrosion Enhancement due to Plasma Post-Oxidation Subsequent to Plasma Nitriding of a Steel AISI 4140

et al. 2015

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The corrosion enhancement due to plasma post-oxidation subsequent to plasma nitriding of the samples of low alloy annealed steel AISI 4140 was evaluated. The plasma nitriding was carried out at ≈570• C for 1-3 h in an atmosphere of 75% H2 and 25% N2. After this process post-oxidation at ≈450• C in a gas mixture, air and dry air-like was conducted for an hour. The treated samples were characterized using the XRD, SEM, AFM, potentiodynamic polarization and Vickers microhardness tests. The outcome of combined processes showed the presence of ε and γ nitrided phases in the inner compound layer and in the outer one mostly of magnetite phase and barely visible of hematite one without using H2 in the post-oxidation process. Also in these processes, the corrosion potential proved to be lower in the treated specimens than the untreated ones, and the corrosion current decreased up to one order of magnitude when treated in environment air and air-like ambient.

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Plasma post oxidation of nitrocarburized hot work steel samples

Cited by 26 publications

References 6 publications

Tribological behaviour of surface-treated and post-oxidized tool steels at room temperature and 400 °C

Tribological behaviour of surface-treated and post-oxidized tool steels at room temperature and 400 °C

Investigation of Microstructure, Nanohardness and Corrosion Resistance for Oxi-Nitrocarburized Low Carbon Steel

The Corrosion Enhancement due to Plasma Post-Oxidation Subsequent to Plasma Nitriding of a Steel AISI 4140

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