Structure and mechanical properties of chromium nitride/S-phase composite coatings deposited on 304 stainless steel

Fryska, S.; Słowik, Justyna; Baranowska, J.

doi:10.1016/j.tsf.2019.01.046

Cited by 10 publications

(4 citation statements)

References 29 publications

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“…As the test load increased, the density of the buckling cracks increased. In none of the cases were delamination characteristics observed 44 . In most cases, a single sample test was performed; however, in the cases in which repetitions were performed for the scratch tests, the same adherence behavior of the coatings to the substrate was identified, where it was not possible to identify the critical load and no delamination phenomena were observed.…”

Section: Resultsmentioning

confidence: 88%

“…Figure 6 shows the images that correspond to the wear tracks obtained by means of the scratch test technique in the coatings M0, M2, and M4. In general, it was not possible to determine the critical load, because there is no evidence of cohesive or adhesive failure, which is an indication of high adhesion of the coatings to the substrate, as well as a ductile characteristic of the coatings 44 . In the coatings M0 and M2, deformation mechanisms associated with the pile-up phenomena were observed, in which only the formation of burrs around the scratch track is in evidence 45,46 .…”

Section: Resultsmentioning

confidence: 99%

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Tribological Evaluation of Ferritic-Austenitic Stainless Steel Coatings with Different Percentages of Silver

2022

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Stainless steels have been evaluated in the form of coatings or thin films deposited using magnetron sputtering in various investigations. In most of these investigations, mainly the microstructural evaluation of this type of coating has been reported, while the evaluation of wear resistance has not been widely studied. In the present investigation, ferritic-austenitic stainless steel coatings with different percentages of silver were deposited by means of unbalanced DC magnetron sputtering. A stainless steel target doped with different numbers of silver inserts (0, 1, 2, 3, and 4 inserts) was used, obtaining coatings with silver percentages of up to 7.7 at. %, in order to evaluate their tribological properties. During the synthesis, the first layer of the bilayer was deposited with argon and the other in an atmosphere of argon and nitrogen. The structure of the coatings was evaluated by use of X-ray diffraction (XRD), and the morphology and the chemical composition were studied by means of scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), respectively. The hardness was tested through nanoindentation, and the wear test was carried out using the pin-on-disc technique. The wear tracks were evaluated via profilometry, SEM, and EDS. In general, the deposited films exhibited BCC and FCC phases and a compact morphology, as well as good adherence to the substrate. The results of the evaluation of the mechanical properties revealed an increase in the hardness of the coatings when the silver content was augmented, obtaining values of 9.8 GPa and 12.1 GPa for coatings with 0 and 4 silver inserts, respectively. Likewise, it was found that the wear resistance of coatings was higher, up to two orders of magnitude compared to the 316L stainless steel substrate. Finally, the wear rate of the multilayers decreased slightly with an increase in the percentage of silver in the films produced, up to an order of magnitude for the coating with 4 silver inserts relative to the coating with 0 silver inserts.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Tribological Evaluation of Ferritic-Austenitic Stainless Steel Coatings with Different Percentages of Silver

2022

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“…This allows to reduce the internal stresses in the coating by decreasing the difference in hardness between the coating and the coated substrate, and in this way to improve the adhesion of the coating to the substrate. Fryska et al [ 44 ] report that the use of an S-phase as an interlayer during the deposition of a Cr 2 N coating improves its adhesion to austenitic stainless steel substrates. It is also possible to increase the hardness of the AISI 304 substrate-Cr 2 N coating system using the S-phase as an interlayer, since the S-phase, showing properties intermediate between the substrate and the outer coating, supports the latter.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Properties of S-Phase/Cr2N Composite Coatings Deposited on Austenitic Stainless Steel

Fryska

Baranowska

2021

Materials

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In order to study the suitability of the S-phase layers as the interlayer for Cr2N chromium nitride coatings, a number of composite coatings were deposited by the reactive magnetron sputtering (RMS) method on austenitic steel substrates with various initial surface conditions (as delivered and polished) and their corrosion resistance was assessed. Coatings with S-phase interlayer were deposited at three different nitrogen contents in the working atmosphere (15%, 30%, and 50%), which influenced the nitrogen concentration in the S-phase. Coatings with chromium, as a traditional interlayer to improve adhesion, and uncoated austenitic stainless steel were used as reference materials. Detailed microstructural and phase composition studies of the coatings were carried out by means of scanning electron microscopy (SEM), optical microscopy (LM), and X-ray diffraction (XRD) and were discussed in the context of results of corrosion tests carried out with the use of the potentiodynamic polarization method conducted in a 3% aqueous solution of sodium chloride (NaCl). The performed tests showed that the electrochemical potential of the S-phase/Cr2N composite coatings is similar to that of Cr/Cr2N coatings. It was also observed that the increase in the nitrogen content in the S-phase interlayer causes an increase in the polarization resistance of the S-phase/Cr2N composite coating. Moreover, with a higher nitrogen content in the S-phase interlayer, the polarization resistance of the S-phase/Cr2N coating is higher than for the Cr/Cr2N reference coating. All the produced composite coatings showed better corrosion properties in relation to the uncoated austenitic stainless steel.

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“…[1,2]. Complex surface engineering technologies have become widely used when 2-3 methods of hardening are performed sequentially [3][4][5][6]. This approach eliminates drawbacks and mutually reinforces the advantages of each technique.…”

Section: Introductionmentioning

confidence: 99%

Improving the wear resistance of heavy-duty elements in tribomechanical systems by a combined laser-thermochemical processing method

Киндрачук

Духота

Тіsov

et al. 2021

EEJET

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This paper reports an analysis of the state of tribological support in the aviation industry. The use of surface strengthening technologies to extend the resource of friction node parts has been prioritized. Modern combined technologies of nitriding and laser treatment of steel surfaces have been reviewed. The mechanism has been elucidated that damages steel 30H2NVFA in the jackscrew actuator of transport aircraft flaps, which occurs due to insufficient surface hardness of the material after a generally accepted heat treatment. Auger electron spectroscopy analysis revealed a high concentration of oxygen on the surface: up to 41.4 at. %; the friction surface carbonation has been detected, especially significant at the surface of the pitting damage. A comprehensive technology of surface strengthening by nitriding+laser selective hardening has been suggested. The radiation power was 1 KW, the diameter of the focus spot was 2.5 mm, and the pitch between the focus spot centers was 2.5 mm. The total area of laser processing was 70 %. The steel temperature exceeded Ас3 and corresponded to the hardening temperature range. The depth of the nitrided layer increased to 400 µm, the maximum hardness on the surface was 1,350–1,380 HV0.2. The formation of a solid nitrided layer with a thickness of 200‒250 µm was observed, as well as a transition zone composed of column-shaped iron nitrides, which are introduced into the matrix material. As a result, a sharp gradient in the mechanical properties disappears. The tests confirmed that the wear resistance of the comprehensively treated surface was 2.1 times higher under dry friction conditions, and 4.5 times higher when lubricated with the "Era" grease (RF), compared with the 30H2NVFA steel nitrided by the conventional technology. In addition, there was no fragile destruction of the surface; the interaction with oxygen reduced significantly

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Structure and mechanical properties of chromium nitride/S-phase composite coatings deposited on 304 stainless steel

Cited by 10 publications

References 29 publications

Tribological Evaluation of Ferritic-Austenitic Stainless Steel Coatings with Different Percentages of Silver

Tribological Evaluation of Ferritic-Austenitic Stainless Steel Coatings with Different Percentages of Silver

Corrosion Properties of S-Phase/Cr2N Composite Coatings Deposited on Austenitic Stainless Steel

Improving the wear resistance of heavy-duty elements in tribomechanical systems by a combined laser-thermochemical processing method

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