Effects of Surface Morphology on the Wear and Corrosion Resistance of Post-Treated Nitrided and Nitrocarburized 42CrMo4 Steel

Sola, Ramona; Poli, Giorgio; Veronesi, Paolo; Giovanardi, Roberto

doi:10.1007/s11661-014-2219-z

Cited by 25 publications

(14 citation statements)

References 18 publications

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“…comprising of a N-enriched layer with a high nitrogen content on top of a C-enriched layer with a high carbon content 6,14 . This is explained by the presence of the ɛ-Fe 3 N and γ'-Fe 4 N phases found in the compound layer for all nitrocarburized samples treated at both temperatures 18,31,32 .…”

Section: Resultsmentioning

confidence: 83%

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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: Resultsmentioning

confidence: 83%

“…The most desirable phase to comprise the microstructure of the compound layer is the single ɛ-Fe 2-3 N phase. However, it has been found that the compound layer formed by plasma nitrocarburizing usually consists of a heterogeneous mixture of ɛ-Fe 2-3 N and γ'-Fe 4 N phases 16,[17][18][19] .…”

Section: Introductionmentioning

confidence: 99%

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

Fontes¹,

Scheid

Machado

et al. 2019

Mat. Res.

View full text Add to dashboard Cite

show abstract

“…Comparing with other surface treatment technologies, the surface of the UNSMed specimen is controllable. The surface morphology plays an important role in the wear and corrosion resistance [28,29]. Thus, it is necessary to search for an optimal arameter combination.…”

Section: Hardness and Residual Stress Distrubutionsmentioning

confidence: 99%

Fatigue Fracture Characteristics of Ti6Al4V Subjected to Ultrasonic Nanocrystal Surface Modification

Cao

et al. 2018

Metals

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Abstract:The influence of ultrasonic nanocrystal surface modification (UNSM) on the fatigue fracture characteristics of Ti6Al4V was investigated. Two groups of specimens were separated due to different heat treatment conditions. Group one was stress-relief annealed at 650 • C, and group two was then treated with solid solution-aging. UNSM with the conditions of a static load of 25 N, vibration amplitude of 30 µm, and 36,000 strikes per unit produced about 40 µm surface severe plastic deformation (SPD) layers on both groups of specimens. UNSM improved the microhardness and the compressive residual stress. UNSM also helped achieve a neat surface, almost without changing the surface roughness. The fatigue strengths of these two groups were improved by 7% and 11.7%, respectively. After UNSM, fatigue cracks mainly initiated from the surface of the specimen before the fatigue life of 10 6 cycles, while they appeared at the internal compress deformed α-phase at the zone between the SPD layer and the core after the fatigue life of 106 cycles. The cracks usually extended along the deformation overflow bands and the process traces on the surface. Through the change of micro-dimples in the fatigue final rupture region, nanocrystals were achieved in the SPD layer. The crystal slip and the surface remodeling together influenced the energy field of crack evolution.

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“…are not so critical for the results. However, the FIMEC technique has failed in testing materials with thin coatings or surface layers (e.g., kolsterized stainless steels [29][30][31], nitrided and nitrocarburized steels [32,33]), where the penetration depth is larger than the 100 µm thicknesses of the surface layers. Failure has also been reported in testing welding seams made through such high energy sources as laser and electron beam, where the diameter of the imprint is larger than the MZ widths [34].…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Flat-Top Cylinder Indenter Examination of Duplex Stainless Steel 2205 after Different Heat Treatments

Angella

Fava

Montanari

et al. 2017

Metals

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Abstract:The duplex stainless steel 2205 was heat treated at 750 • C, 850 • C, and 900 • C for increasing durations of up to 10 h. The samples were investigated through light microscopy (LM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) to characterize the volume fraction and morphology of the precipitated secondary phases. The samples were then tested via flat-top cylinder indenter for mechanical characterization (FIMEC) testing to determine the yield stresses that were found to be significantly affected by the different heat treatments. The yield stress evolution with heat treatments resulted in being correlated to both the relative volumes of the secondary phases and the morphology of the σ phase. The FIMEC test proved to be capable of detecting the effects of small amounts of secondary phases on yield stress in DSS 2205 and seems to be a promising technique for industrial applications.

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Effects of Surface Morphology on the Wear and Corrosion Resistance of Post-Treated Nitrided and Nitrocarburized 42CrMo4 Steel

Cited by 25 publications

References 18 publications

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

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

Fatigue Fracture Characteristics of Ti6Al4V Subjected to Ultrasonic Nanocrystal Surface Modification

Flat-Top Cylinder Indenter Examination of Duplex Stainless Steel 2205 after Different Heat Treatments

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