NDLI: Hardening of carbonaceous and alloyed steels by low energy nitrogen ions irradiation in arc discharge plasma

Content Provider	IEEE Xplore Digital Library
Author	Belous, V.A. Nosov, G.I.
Copyright Year	2004
Description	Author affiliation: National Science Center, Kharkov Institute of Physics and Technology, Akademicheskaya St. 1, Kharkov 61 108 Ukraine (Belous, V.A.; Nosov, G.I.)
Abstract	Effect of low energy nitrogen ions irradiation in arc discharge plasma on structure and properties of a surface carbonaceous and alloyed steels (U8, St.30, PhVG, Ph12M, 5PhNV) was studied. The ion irradiation of steel specimens was performed vacuum facility with a triode gas plasma source based on thermionic cathode arc discharge ignited in atmosphere of pure nitrogen at low pressure. The nitrogen ions bombarded steel specimens surface carried out an energy 600 eV. The pressure of nitrogen at ion irradiation was 0,9...2 Pa. The temperature of irradiated specimens was not above 520°C. Studies were made into the structure, composition and microhardness of irradiated carbonaceous and alloyed steel specimens. Metallographic, X-ray diffraction and electron-microscope methods were used to investigate the surfaces of irradiated specimens. It is founded that microhardness of irradiated steel specimens surface increases by factors of 1.8 to 3. The thickness of strengthened layer reaches 80 ... 100 microns. Unstrengthening of bulk after nitrogen ions irradiation took place for carbonaceous steels with low heat resistance (U8, St.30). The bulk of material exhibits practically no unstrengthening after ion irradiation of alloyed steels with high heat resistance (PhVG, Ph12M, 5PhNV). The X-ray diffraction analysis performed for irradiated steels by nitrogen ions points presence of Fe 2-3/N (ϵ-phase), $Fe_{4}N$ (γ-phase) and carbide phase in most cases. Wear resistant and life-in-service of steel tools after nitrogen ions irradiation (U8, PhVG) were increased by factors of 2 or 3.
Starting Page	591
Ending Page	594
File Size	333287
Page Count	4
File Format	PDF
ISBN	078038461X
ISSN	10932941
DOI	10.1109/DEIV.2004.1422685
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-09-27
Publisher Place	Crimea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Iron alloys Steel Nitrogen Arc discharges Plasma sources Cathodes Plasma properties Surface discharges Plasma materials processing X-ray diffraction
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Software

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