Microstructure of nitrided and nitrocarburized layers produced on a superaustenitic stainless steel

Fernandes, Frederico Augusto Pires; Casteletti, Luíz Carlos; Gallego, Juno

doi:10.1016/j.jmrt.2013.01.007

Cited by 27 publications

(10 citation statements)

References 19 publications

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“…Despite the extensive work was carried out on some aspects, such as phase transformation, welding and Nitrocarburizing [2,17,18], very few studies have been reported on the hot deformation and DRX behavior for this material. Therefore, the aims of the present work are to systematically investigate the flow behavior, kinetic analysis and DRX characteristics in as-cast 254SMO SASS under high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Constitutive equation and dynamic recrystallization behavior of as-cast 254SMO super-austenitic stainless steel

Han

Zhang

et al. 2015

Materials & Design

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Section: Introductionmentioning

confidence: 99%

Constitutive equation and dynamic recrystallization behavior of as-cast 254SMO super-austenitic stainless steel

Han

Zhang

et al. 2015

Materials & Design

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“…The nitriding of steel UNS S31254 between 400 and 500 • C resulted in expanded austenite with a lattice expansion of 5-10% [16]. At a treatment time of 5 h, the layer thickness after nitriding increased from 5 to 20 µm, with nitrocarburizing producing thicker layers [17]. At the same time, CrN precipitates have been identified with TEM even at 400 • C. Using the same steel alloy, nitriding at lower temperatures between 300 and 400 • C resulted in an expanded phase [18].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Nitriding Behavior for Austenitic Stainless Steel 316Ti and Super Austenitic Stainless Steel 904L

Mändl,

Manova

2024

Metals

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In situ X-ray diffraction (XRD) was used to compare nitrogen low-energy ion implantation (LEII) into austenitic stainless steel 316Ti and super austenitic stainless steel 904L. While the diffusion and layer growth were very similar, as derived from the decreasing intensity of the substrate reflection, strong variations in the observed lattice expansion—as a function of orientation, the steel alloy, and nitriding temperature—were observed. Nevertheless, a similar resulting nitrogen content was measured using time-of-flight secondary ion mass spectrometry (ToF-SIMS). Furthermore, for some conditions, the formation of a double layer with two distinct lattice expansions was observed, especially for steel 904L. Regarding the stability of expanded austenite, 316Ti had already decayed in CrN during nitriding at 500 °C, while no such effect was observed for 904L. Thus, the alloy composition has a strong influence only on the lattice expansion and the stability of expanded austenite—but not the diffusion and nitrogen content.

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“…The right content of chromium and molybdenum as well as the heterogeneity and stability of austenite contributes to increased durability of the passive layer [ 1 ]. Apart from the aforementioned elements, the austenite structure is further stabilised by light elements, which include nitrogen and carbon [ 2 , 3 ]. Recently, superaustenitic steels have drawn increased attention.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Corrosion Resistance of Austenitic Steel Using Active Screen Plasma Nitriding and Nitrocarburising

Borowski

2021

Materials

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AISI 316L steel was subjected to active screen plasma nitriding and nitrocarburising. The processes were carried out at 440 °C for 6 h. The nitriding process employed an atmosphere of nitrogen and hydrogen, while nitrocarburising was carried out in nitrogen, hydrogen and methane. The processes yielded structures consisting of nitrogen and nitro-carbon expanded austenite, respectively. Microhardness was measured via the Vickers method, surface roughness using an optical profilometer, microstructure by means of light microscopy, while a scanning electron microscope (SEM) served to determine surface topography. Phase composition, lattice parameter and lattice deformation tests were carried out using the X-ray diffraction (XRD) method. Corrosion resistance measurements were performed in a 0.5 M NaCl solution using the potentiodynamic method. The produced layers showed very high resistance to pitting corrosion, while the pitting potential reached 1.5 V, a value that has not yet been recorded in a chloride environment. After the passive layer was broken down, there was a clear deceleration of pitting in the nitrocarburised layer. It was found that in the case of nitro-carbon expanded austenite, pits are formed much slower compared to the nitrogen austenite layer.

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Microstructure of nitrided and nitrocarburized layers produced on a superaustenitic stainless steel

Cited by 27 publications

References 19 publications

Constitutive equation and dynamic recrystallization behavior of as-cast 254SMO super-austenitic stainless steel

Constitutive equation and dynamic recrystallization behavior of as-cast 254SMO super-austenitic stainless steel

Comparison of Nitriding Behavior for Austenitic Stainless Steel 316Ti and Super Austenitic Stainless Steel 904L

Enhancing the Corrosion Resistance of Austenitic Steel Using Active Screen Plasma Nitriding and Nitrocarburising

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