Initial phase formation during nitriding of austenitic stainless steel

Manova, D.; Mändl, S.

doi:10.1016/j.surfcoat.2023.129258

Cited by 9 publications

(3 citation statements)

References 44 publications

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“…Williamson et al [98] suggested that it may be due to the high residual stress, induced between the expanded austenite layer and the substrate, while Christiansen et al [102] hypothesized that it may be related to the N concentration profile. Recently, in 316Ti steel subjected to N low-energy ion implantation in order to study the initial phase of nitriding, Manova and Mändl [127] observed the formation of a low-expansion f.c.c. phase, that subsequently transformed into expanded austenite when the N content increased.…”

Section: Microstructure and Characteristics Of The Modified Surface L...mentioning

confidence: 99%

The Corrosion Behavior in Different Environments of Austenitic Stainless Steels Subjected to Thermochemical Surface Treatments at Low Temperatures: An Overview

Borgioli

2023

Metals

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Low-temperature thermochemical treatments are particularly suitable for use in the surface hardening of austenitic stainless steels without impairing their corrosion resistance. In fact, when using treatment media rich in nitrogen and/or carbon at relatively low temperatures (<450 °C for nitriding, <550 °C for carburizing), it is possible to inhibit the formation of chromium compounds and obtain modified surface layers that consist mainly of a supersaturated solid solution, known as expanded austenite or S-phase. It has been observed that this hard phase allows the enhancement of corrosion resistance in chloride-ion-containing solutions, while the results were contradictory for chloride-free acidic solutions. This overview aims to discuss the corrosion behavior of low-temperature-treated austenitic stainless steels, taking into account the different microstructures and phase compositions of the modified layers, as well as the different test environments and conditions. In particular, the corrosion behavior in both chloride-ion-containing solutions and chloride-free solutions (sulfuric acid, sulfate and borate solutions) is discussed. The analysis of the international literature presents evidence that the microstructure and phase composition of the modified layers have key roles in corrosion resistance, especially in sulfuric acid solutions.

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Section: Microstructure and Characteristics Of The Modified Surface L...mentioning

confidence: 99%

The Corrosion Behavior in Different Environments of Austenitic Stainless Steels Subjected to Thermochemical Surface Treatments at Low Temperatures: An Overview

Borgioli

2023

Metals

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“…Still, improvements and prospects are expected in the near future, with an observed large activity in the field [ 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 ]. Overall, a more detailed picture of the complex nitriding process could be obtained.…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

Low Temperature Nitriding of Metal Alloys for Surface Mechanical Performance

Drouet

Bourhis

2023

Materials

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Metallic alloys are, by essence, ductile and stiff and can support loads without sudden rupture. This ductility becomes a disadvantage when applications require wear resistance. In this case, the hardening of the surface is required while retaining a core performance. Here, nitriding at low temperatures has proven to be beneficial and has potential. In fact, any phase transitions or unwanted compound precipitations that occur at higher temperatures have to be avoided as they would have a deleterious effect on the chemical homogeneity and mechanical properties. The present contribution summarizes the achievements made with such treatments on metallic alloys. We considered the most popular treatments, namely plasma, implantation, and gas nitridings.

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“…However, their low hardness and low resistance to frictional wear severely limit their industrial application. An increasing number of thermochemical methods have been used to improve the surface of ASSs, including nitriding [4][5][6][7][8][9][10], carburizing [9,[11][12][13][14], nitrocarburizing [13,15,16], oxynitriding [17], and boriding [18]. Of the above technologies, the most widely used and researched is glow discharge nitriding, which, at a low nitriding temperature (below 450 • C) and a short process time (less than 6 h), produces a precipitationfree nitrogen austenite (γN) on the surface, the so-called S phase (expanded austenite), with high corrosion resistance and good wear resistance [15,16,19].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Nitriding Temperature of AISI 316L Steel on Sub-Zero Corrosion Resistance in C2H5OH

Kucharska,

Kamiński,

Kulikowski

et al. 2024

Materials

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In this paper, glow nitriding processes at cathode potential are used at various temperatures to investigate how they affect the corrosion resistance of 316L steel in ethanol at temperatures of 22 °C and −30 °C. Lowering the test temperature reduces the corrosion rate of the nitrided layers. Conversely, glow nitriding at 450 °C improves the corrosion resistance of the tested steel. Increasing the nitriding temperature to 520 °C increases the corrosion rate. It should be noted that the ethyl alcohol solution, due to the lack of aggressive ions, does not cause significant changes in the corrosion rate of the steel. The value of the corrosion current varies in the range of 10−2–10−3 µA/cm2. Nitrided layers increase the contact angle measured for water and are entirely wettable for ethanol. The objective of this study is to evaluate the effect of the nitriding temperature of AISI 316L steel on its corrosion resistance in an ethanol solution at room temperature and at −30 °C.

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Initial phase formation during nitriding of austenitic stainless steel

Cited by 9 publications

References 44 publications

The Corrosion Behavior in Different Environments of Austenitic Stainless Steels Subjected to Thermochemical Surface Treatments at Low Temperatures: An Overview

The Corrosion Behavior in Different Environments of Austenitic Stainless Steels Subjected to Thermochemical Surface Treatments at Low Temperatures: An Overview

Low Temperature Nitriding of Metal Alloys for Surface Mechanical Performance

The Effect of Nitriding Temperature of AISI 316L Steel on Sub-Zero Corrosion Resistance in C2H5OH

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