PLASMA NITRIDING OF AISI 5140 LOW ALLOY STEEL ASSISTED WITH HOLLOW CATHODE DISCHARGE AT LOW PRESSURE

Enbo Wang, Hao Yang and Liang Wang ()
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Enbo Wang: Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, P. R. China
Hao Yang: Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, P. R. China
Liang Wang: Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, P. R. China

Surface Review and Letters (SRL), 2018, vol. 25, issue 04, 1-5

Abstract: Plasma nitriding of AISI 5140 low alloy steel was carried at pressures ranging from 100Pa–500Pa for 4h with hollow cathode discharge assistance. The treated samples were characterized by optical microscope, microhardness tester, X-ray diffraction and electrochemical workstation. The results show that the compound layer is about 5μm in thickness and the depth of surface hardening layer is about 240μm for the sample nitrided at 100Pa for 4h. The hardness value of nitrided surface is about 830HV0.1, which is about 2.9 times higher than that (290HV0.1) of the substrate. There is no obvious difference in the thickness of compound and diffusion layers, surface microhardness and phase composition of nitrided layers in comparison with that of samples nitrided at pressure 300 and 500Pa used by conventional plasma nitriding. But plasma nitriding with low pressure can effectively reduce the assumption of nitriding gas and amount of exhausted emission.

Keywords: Low pressure; plasma nitriding; hollow cathode discharge (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1142/S0218625X18500865

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