Martensitic Stainless Steels Low-temperature Nitriding: Dependence of Substrate Composition

Ferreira, Lauro Mariano; Brunatto, Sílvio Francisco; Cardoso, Rodrigo Perito

doi:10.1590/1516-1439.015215

Cited by 41 publications

(23 citation statements)

References 16 publications

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“…7,11,21) All average grain sizes for all specimens are calculated according to ASTM standard as listed in Table 3. 27) In Fig.…”

Section: Resultsmentioning

confidence: 99%

“…5,7,9,11,21,28,33,34) In case of the nitrogen ion implantation, the nitrided layer thickness was only 5 μm with the anisotropic lattice expansion up to 3.5%. High energetic implantation of nitrogen ions at 25 kV induced this high lattice strain.…”

Section: Discussionmentioning

confidence: 99%

“…5,6) Among various parameters such as the alloying elements, 7) the cathode setups, 8) the gas mixtures, 9) the nitriding times, 10) and the nitriding temperatures, 11,12) the holding temperature has the most significant impact on the nitriding processes as well as the mechanical and chemical properties of nitrided stainless steels.…”

Section: -4)mentioning

confidence: 99%

“…7,11,21) The expanded phases are supersaturated with nitrogen interstitials; e.g., much lattice expansion was observed up to 10%. 22) These phases are considered to be metastable to drive the hardening process and to improve the corrosion resistance.…”

Section: Nitrogen Supersaturation Process In the Aisi420 Martensitic mentioning

confidence: 99%

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Nitrogen Supersaturation Process in the AISI420 Martensitic Stainless Steels by Low Temperature Plasma Nitriding

Farghali

Aizawa

2018

ISIJ International

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“…7,11,21) All average grain sizes for all specimens are calculated according to ASTM standard as listed in Table 3. 27) In Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: -4)mentioning

confidence: 99%

Section: Nitrogen Supersaturation Process In the Aisi420 Martensitic mentioning

confidence: 99%

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Nitrogen Supersaturation Process in the AISI420 Martensitic Stainless Steels by Low Temperature Plasma Nitriding

Farghali

Aizawa

2018

ISIJ International

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“…Regarding the short nitriding treatments, Scheuer et.al performed nitriding treatments at different temperatures for 4 and 8 hours. They made a detailed study of microstructure and detected chromium nitrides precipitation when the process was carried out at 450 ºC for 4 hours [14][15][16] ; however, they did not evaluate the corrosion behaviour. Li et al analyzed the wear and corrosion behaviour of AISI 420 martensitic stainless steels that were nitrided at different temperatures for 6 hours using the anodic potential active screen plasma nitriding technique.…”

Section: Introductionmentioning

confidence: 99%

Short Time Ion Nitriding of AISI 420 Martensitic Stainless Steel to Improve Wear and Corrosion Resistance

Dalibón

Charadía

Cabo³

et al. 2019

Mat. Res.

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Plasma nitriding has become a powerful tool to improve wear resistance of stainless steels and sustain or improve corrosion resistance with an adequate selection of process parameters. In this work, the short treatment route with temperatures above 400°C was selected for AISI 420 stainless steel. After the nitriding process, a wide nitrided layer, with good wear and corrosion properties was simultaneously obtained with selected parameters. A 5 hours treatment at 420 °C resulted in a 10 μm nitrided layer. XRD revealed an expanded Fe-α layer with Fe nitrides but no signal of CrN was found. Wear resistance was improved three and four times in erosion and sliding tests compared to the non-nitrided material. Corrosion resistance was tested in anodic polarization experiments in a NaCl solution. In this test, the samples treated in the short time process presented the best results.

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A Novel Concept of Hybrid Treatment for High‐Hardenability Steels: Concomitant Hardening and Paraequilibrium Thermochemical Treatment to Produce Interstitially Hardened/Stabilized Austenite Surfaces

Toscano

Cardoso

Brunatto

2020

steel research int.

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Steel components' performance requirements are being strongly increased due to the technological evolution of machines. In most of the cases, surface and bulk material requirements are extremely different, so, an optimised component should present different surface and bulk properties. In such a context, the application of surface engineering processes becomes unavoidable and, to achieve the desired performance at acceptable cost, frequently, new materials and/or processing routes are necessary. The novel concept of hybrid treatment proposed here makes possible to obtain components with such characteristics in a single thermal cycle. So it should be a powerful tool helping to overcome the challenges imposed to the metallurgical industry to produce components that present simultaneously high strength and wear and corrosion resistances at lower costs. This process is the subject of a pending patent BR1020180150758 [1] and this communication has the objective of presenting the new hybrid treatment concept, proving its feasibility by means of a case study. The hybrid process, applicable to highhardenability steels, consists in carrying out a thermochemical treatment during the isothermal step of the martempering or austempering hardening treatment (see Figure 1), above the martensite start temperature and so in the metastable austenite field. Thus, this process combines a surface treatment and a substrate bulk treatment, in a same thermal cycle, probably leading to the reduction of the treatment costs as a whole (hardening plus thermochemical treatment). In addition, it enables to produce a hard interstitially hardened/stabilized austenite treated surface, supposedly presenting higher wear and corrosion resistances than the substrate bulk material. In this concept, depending on the steel hardenability and the chosen processing parameters, the bulk material can be either martensitic or bainitic. The stabilized austenite surface can be produced by paraequilibrium nitriding or carburizing thermochemical treatment. The new concept of hybrid treatment is schematically shown in Figure 1. The first step consists in heating a high-hardenability steel component until the austenitizing temperature, waiting for its complete transformation to stable austenite, and this is the "zero" time point in the Figure 1 scheme. In the sequence, the component/part is cooled down to a temperature that enables the paraequilibrium thermochemical treatment to be conducted, in the metastable austenite field, avoiding the martensitic transformation. The paraequilibrium thermochemical treatment step, in the present case nitriding, is successfully performed at temperatures usually below 420 C for austenitic steels. [2-4] As soon as the paraequilibrium thermochemical treatment step is concluded, the component/part can be cooled down to the room temperature. The last cooling step can produce different microstructure in the component bulk (see Figure 1): 1) for the process ending in "A", a martensitic bulk material will be produced;

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Martensitic Stainless Steels Low-temperature Nitriding: Dependence of Substrate Composition

Cited by 41 publications

References 16 publications

Nitrogen Supersaturation Process in the AISI420 Martensitic Stainless Steels by Low Temperature Plasma Nitriding

Nitrogen Supersaturation Process in the AISI420 Martensitic Stainless Steels by Low Temperature Plasma Nitriding

Short Time Ion Nitriding of AISI 420 Martensitic Stainless Steel to Improve Wear and Corrosion Resistance

A Novel Concept of Hybrid Treatment for High‐Hardenability Steels: Concomitant Hardening and Paraequilibrium Thermochemical Treatment to Produce Interstitially Hardened/Stabilized Austenite Surfaces

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