Effect of Methane Addition on Formation of Plasma Nitrocarburized Layers

Silva, Heloisa Regina Turatti; Egert, Paola; Seeber, Allan; Speller, C. V.

doi:10.1007/s13632-016-0324-7

Cited by 4 publications

(2 citation statements)

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“…The compound layers formed under higher amount of CH 4 consists mainly of the ɛ-Fe 2-3 N phase with trace amounts of the γ'-Fe 4 N phase. The addition of methane in the gas mixture increased the amount of carbon in the nitrocarburized atmosphere, and consequently increased the ɛ-Fe 2-3 N phase amount in the modified surface layer, as reported in the literature 22,23,26 .…”

Section: Resultssupporting

confidence: 76%

“…A plasma nitriding without carbon in its treatment atmosphere is able to produce a microstructure in the compound layer composed by only the γ'-Fe 4 N phase 22,23 , with the formation of no ɛ-Fe 2-3 N phase, or only a small amount of it 24 . The stabilization of the ɛ-Fe 2-3 N phase is possible by using, for instance, methane as a carbon source in the nitrocarburizing atmosphere 25,26 .…”

Section: Introductionmentioning

confidence: 99%

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Morphology of the DIN 100Cr6 Case Hardened Steel after Plasma Nitrocarburizing Process

Fontes¹,

Scheid

Machado

et al. 2019

Mat. Res.

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Nitrocarburizing is considered one of the most important thermochemical treatments for surface modification of metallic materials and involves the simultaneous diffusion of nitrogen and carbon onto the surface. Understanding and controlling the formation of the nitrocarburized layer have considerable industrial interest due to the improvements regarding wear, fatigue, and corrosion resistances. DIN 100Cr6 steel samples were treated by plasma nitrocarburizing for two hours, with two treatment temperatures (550 and 600°C) and four methane concentrations in the gas mixture composition (0, 1.0, 1.5, and 2.0%). SEM and XRD analyses, and wear resistance tests were used to characterize the samples. Results showed that the treatment temperature and atmosphere composition had considerable influence on the compound layer morphology. For nitrided samples the compound layer consists of γ'-Fe 4 N phase, and the presence of carbon in the gas mixture helps stabilize the ɛ-Fe 2-3 N phase. Higher CH 4 concentration in the treatment atmosphere improve the sample superficial wear resistance.

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Section: Resultssupporting

confidence: 76%