Microstructures and mechanical properties of surface-hardened layer produced on SKD 61 steel by plasma radical nitriding

Lee, Insup; Park, Ikmin

doi:10.1016/j.msea.2006.02.412

Cited by 18 publications

(9 citation statements)

References 5 publications

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“…11 shows Vickers type of micro-hardness measurements for the coated samples starting from coating surface to inner substrate. As reported from the previous studies [23,24] and experienced in this study, radical nitriding process resulted in higher coating hardness value when the Samples (II) and (III) are examined. Contrary to expectations, sample (II), with the highest coating hardness, did not perform the best.…”

Section: Resultssupporting

confidence: 73%

Wear performance assessment of alternative stamping die materials utilizing a novel test system

Cora

Namiki

Koç

2009

Wear

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Section: Resultssupporting

confidence: 73%

Wear performance assessment of alternative stamping die materials utilizing a novel test system

Cora

Namiki

Koç

2009

Wear

View full text Add to dashboard Cite

“…The surface hardness of the plasma nitrided layer is approximately three times higher than that of the non-nitrided surface. 27 . The case depth increases with increasing time, temperature and nitrogen concentration as expected for diffusion-controlled growth 16,17 .…”

Section: Modification Of Surface Properties After Plasma Nitridingmentioning

confidence: 99%

Response of a DIN 18MnCrSiMo6-4 Continuous Cooling Bainitic Steel to Different Plasma Nitriding Gas Mixtures

et al. 2020

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Continuous cooling bainitic steels has been widely used in industrial processes owing to its excellent mechanical properties and toughness. Although the surface properties of them are acceptable for many purposes, for their use in mechanical components like gears, it is necessary to improve their surface properties. Plasma nitriding treatments was carried out of a DIN 18MnCrSiMo6-4 steel at 500 °C, with three different nitrogen gas composition: 76, 24 and 5 vol.% nitrogen in hydrogen, for 3, 6 and 9 hours. The surfaces were characterized concerning the microstructure, microhardness, fracture toughness, nitrogen concentration and carbon composition, phase composition and residual stress states. Based on the results presented, layer growth constants (k) for different nitrogen gas composition was determined. The carbon profiles of samples indicate that there was decarburization during the plasma nitriding. The nitrided samples with thicker compound layers presented a fracture behavior dominated by the formation of Palmqvist cracks. X-ray phase analysis indicated the formation of biphasic compound layer on the surface of all nitrided samples with 76 and 24 vol.% nitrogen, while the nitrided samples with 5 vol.% nitrogen indicated the formation of monophasic compound layer. The diffusion zone presented compressive residual stresses with highest values near the surface.

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“…The effective hardening depth was approximately 50 μm at the maximum; this value is smaller than that of plasma nitriding in a vacuum for the same material, treatment temperature, and treatment time. 17,18) It is concluded that the reduction of the depth of the diffusion layer was caused by the oxidation film and the recombination loss of nitrogen species. Figure 6 shows the XRD patterns of the untreated sample and the samples nitrided with 5 slm of nitrogen.…”

Section: Experimental Methods and Conditionsmentioning

confidence: 99%

Effect of Oxidation on Surface Properties of AISI H13 Tool Steel Nitrided by Atmospheric-Pressure Plasma

2021

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Atmospheric-pressure plasma nitriding of AISI H13 tool steel is performed using a dielectric barrier discharge method. As the surface of the sample nitrided by atmospheric-pressure plasma is oxidized, the surface characteristics are considered to be different from those of conventional plasma nitriding in a vacuum. In this study, the surface properties of the nitrided layer such as tribological properties generated by atmospheric-pressure plasma nitriding are investigated. The results show that the surface and crosssectional hardness of the nitrided sample increase as the amount of nitrogen gas increases. By contrast, the surface and cross-sectional hardness of the nitrided sample increase as the amount of hydrogen gas decreases. Moreover, the surface luster of the nitrided samples changes unlike the untreated samples; however, the surface roughness of all the nitrided samples is similar to that of the untreated samples. When compared with an untreated sample, the friction coefficient and wear resistance of the nitrided sample are improved. For this reason, we consider that the nitriding in this research also causes oxidation by oxygen, similar to oxynitriding. Samples with oxidation film formed by atmospheric-pressure plasma nitriding have excellent wear resistance and friction coefficient, demonstrating the superiority of atmospheric-pressure plasma nitriding for treating small components.

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Microstructures and mechanical properties of surface-hardened layer produced on SKD 61 steel by plasma radical nitriding

Cited by 18 publications

References 5 publications

Wear performance assessment of alternative stamping die materials utilizing a novel test system

Wear performance assessment of alternative stamping die materials utilizing a novel test system

Response of a DIN 18MnCrSiMo6-4 Continuous Cooling Bainitic Steel to Different Plasma Nitriding Gas Mixtures

Effect of Oxidation on Surface Properties of AISI H13 Tool Steel Nitrided by Atmospheric-Pressure Plasma

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