Stainless Steel Surface Nitriding in Open Atmosphere Cold Plasma: Improved Mechanical, Corrosion and Wear Resistance Properties

Mateescu, A.O.; Mateescu, Gheorghe D.; Bălan, Adriana; Ceaus, C.; Stamatin, I.; Cristea, Daniel; Samoilă, Cornel; Ursuțiu, Doru

doi:10.3390/ma14174836

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…Instead, in the case of the CrAlN coat, the substrate preparation was found to have no significant impact on its properties. Heat and surface treatments are techniques generally proven to be useful for improving mechanical properties by causing changes to the surface of materials [18]. In summary, steel X39Cr13 is a popular, medical-grade material used for various instruments, including surgical ones [23].…”

Section: Resultsmentioning

confidence: 99%

“…The process was carried out at a temperature of 400-450 • C. The researchers revealed that nitrogen-induced lattice expansion occurs below the nitridecontaining surface layer in Invar 36 alloy after TPN treatment, implying that Cr is not necessary for the nitrogen-interstitial-induced lattice expansion phenomenon to occur also suggesting another type of gamma (N). More and more studies related to nitriding focus on nitriding corrosion-resistant steels [16][17][18][19][20][21]. Lin et al [16] studied plasma-nitrided austenitic stainless steel.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of the Geometric Structure of X39Cr13 Steel upon Thermochemical Treatment Specific to Medical-Grade Steels

2022

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This paper presents the results of the multi-aspect surface characterization of X39Cr13 steel samples subjected to technological processes specific to medical instrumentation, such as heat and thermochemical treatment, as well as sterilization, which are implemented in corrosion resistance measurements. The application of numerical methods of fractal analysis to averaged profiles obtained from SEM images resulted in double-log plots of structure function, from which the determination of the fractal parameters of interest was possible. The discussion was focused on the fractal dimension D, which governs relative height variations upon scaling in length, and corner frequency fc, which separates the scaling behavior of different-order structures (particles and their aggregates). The obtained results show that the heat treatment leaves behind a granular structure of steel (D2 = 2.43; fc2 = 1.97 nm), whereas corrosion tests reveal the appearance of pits (D1 = 2.17; fc1 = 0.303 nm; D2 = 2.59; fc2 = 4.76 nm). In turn, the ion nitriding improves the resistance of steel X39Cr13 to local corrosion. The fractal analysis also shows that the structure of the nitrided layer differs insignificantly from that of the untreated material, seen only as a shortening of the radius of the self-similarity area by a factor of two (fc2 = 1 nm).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolution of the Geometric Structure of X39Cr13 Steel upon Thermochemical Treatment Specific to Medical-Grade Steels

2022

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“…Mateescu A.O. et al [61] used cold plasma surface treatment to improve the mechanical, wear and protective properties of the surface of AISI304 stainless steel. The results showed that the surface friction coefficient of the treated material could be reduced to 0.2, the corrosion resistance was improved, and the surface hardness was higher than that of the untreated surface.…”

Section: Ion Implantation Technologymentioning

confidence: 99%

Surface Protection Technology for Metallic Materials in Marine Environments

Xu,

Lu,

Cai

et al. 2023

Materials

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As the demand for the development and utilization of marine resources continues to strengthen, the service requirements for advanced marine equipment are rapidly increasing. Surface protection technology has become an important way of solving the tribological problems of extreme operating conditions and improving the safety performance of equipment by imparting certain special properties to the surface of the material through physical, chemical or mechanical processes to enhance the ability of the material to withstand external environmental factors. Combined with the extremely complex characteristics of the marine environment, this paper describes the commonly used surface protection technologies for metal materials in the marine environment. Research on surface texture was summarized under different surface reshaping technologies, as well as processes and coating materials under different surface modification technologies. Combined with the existing research progress and development trends of marine metallic materials, the surfaces of metal materials under the marine environment protection technology foreground are prospected and provide a reference for the improvement of equipment performance in extreme marine environments.

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“…As already mentioned, the nitrided sample is characterized by increased surface hardness, increased wear resistance, high fatigue strength, increased corrosion resistance, and high dimensional stability [1,[24][25][26][27][28][29][30][31][32][33][34][35][36][37]. This is possible because a sufficiently high concentration of nitrogen on the steel surface determines the formation of Fe-N phases.…”

Section: Introductionmentioning

confidence: 99%

Effect of Machine Pin-Manufacturing Process Parameters by Plasma Nitriding on Microstructure and Hardness of Working Surfaces

Dudziński,

Medyński,

Sacher

2023

Crystals

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This work concerns two stages of research into plasma nitriding (change of nitriding steel and modification of nitriding parameters). In the first stage, pins obtained from currently used steel were compared with pins made of an alternative material available on the market, using the same nitriding process parameters. As a result of the metallographic tests carried out, in the first case, the presence of a thin, porous, and heterogeneous nitrided layer or its absence was found, with the core in its raw state and not thermally improved. In the second case, the presence of a nitrided layer of small thickness with noticeable porosity on the surface of the sample was found, but with a core after heat treatment (incorrect process parameters). Therefore, modification of the parameters of the nitriding process was proposed, in terms of a mixture of gases, currents, time, and temperature of the nitriding process. As a result, a satisfactory effective thickness of the nitrided layer was obtained, consisting of a white near-surface zone with ε and ε + γ′-type nitrides with a thickness of 8.7 to 10.2 µm, and a dark zone of internal nitriding with γ′ nitrides. The nitrides layer was continuous, compact, and well adhered to the steel surface. In the core of the samples, the presence of a fine-needle tempering sorbite structure with a small amount of fine bainite, which is correct for the steel after heat treatment and nitriding, was found. The most favorable parameters of the ion nitriding process were gas flow rate (1.5 L/min N; 0.4 L/min H; 0.3 L/min Ar); currents (BIAS—410 V 4.0 A, SCREEN—320 V 4.0 A); time (26 h and 35 min); and temperature (550 °C).

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Stainless Steel Surface Nitriding in Open Atmosphere Cold Plasma: Improved Mechanical, Corrosion and Wear Resistance Properties

Cited by 6 publications

References 17 publications

Evolution of the Geometric Structure of X39Cr13 Steel upon Thermochemical Treatment Specific to Medical-Grade Steels

Evolution of the Geometric Structure of X39Cr13 Steel upon Thermochemical Treatment Specific to Medical-Grade Steels

Surface Protection Technology for Metallic Materials in Marine Environments

Effect of Machine Pin-Manufacturing Process Parameters by Plasma Nitriding on Microstructure and Hardness of Working Surfaces

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