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Tribological properties of the modified layers prepared on 38CrMoAl steel by plasma nitrocarburized and post-sulfurized method.
- Source :
-
Vacuum . Oct2024, Vol. 228, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
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Abstract
- The tribological properties of the different modified layers of plasma nitrocarburized and post-sulfurized on 38CrMoAl steel under oil lubrication were investigated, and the wear mechanism was proposed. The modified layers were prepared by the plasma nitrocarburized at 520 °C for 5 h and post-sulfurized at 160 °C for 1, 3, and 5 h. The morphology, phase structures, and composition were characterized by optical microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, three-dimensional white light interferometry, X-ray diffraction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The sliding-wear characteristics were investigated by ball-on-disk wear tests against GCr15 steel counterparts. The results show that the nitrocarburized layer mainly comprises ε-Fe 2-3 (N, C) and γ ′-Fe 4 (N, C), with a surface hardness of 1250 HV 0.1. The nitrocarburized treatment significantly improved the wear resistance of the 38CrMoAl steel. For the plasma nitrocarburized and post-sulfurized samples, a sulfurized layer mainly consisting of FeS and FeS 2 was formed on the nitrocarburized layer. The wear mass loss and friction coefficient of the duplex samples are significantly reduced due to the thin FeS layer acting as a solid lubricant. A two-step method, plasma nitrocarburized and post-sulfurized duplex treatment, further improves tribological performance, which is crucial for engineering applications. • Plasma nitrocarburized and post-sulfurized duplex treatment can improve tribological performance. • Hollow cathode discharge resolves the main issues present in traditional methods. • The sulfurized layer provides an excellent solid lubrication effect. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0042207X
- Volume :
- 228
- Database :
- Academic Search Index
- Journal :
- Vacuum
- Publication Type :
- Academic Journal
- Accession number :
- 179137916
- Full Text :
- https://doi.org/10.1016/j.vacuum.2024.113473