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Comparison of measured and calculated thickness of martensite and ledeburite shells around graphite nodules in the hardened layer of nodular iron after laser surface remelting
Grum, Janez (Avtor), Šturm, Roman (Avtor)

URLURL - Predstavitvena datoteka, za dostop obiščite http://www.elsevier.com/gej-ng/29/30/23/114/27/41/abstract.html Povezava se odpre v novem oknu

Izvleček
The application of laser surface remelting to nodular iron 400-12 causes the material to undergo microstructural changes. Because of the rapidity of laser beam action on the surface of the specimen material, melting occurs only in a thin surface layer. After the laser beam has passed along the specimen, thanks to very rapid heat transfer from the surface to the interior of the specimen, we can achieve very rapid solidification of the melted pool and self-hardening of the rest of the modified layer. The process of rapid heating above the melting-point temperature and the temperature of the austenitic transformation creates conditions for the formation of metastable microstructures that can offer important technological properties such as high hardness, good wear and corrosion resistance. A newly created austenite-cementite microstructure with the presence of graphite nodules in the remelted layer and a martensite-ferrite microstructure with graphite nodules in the hardened layer have been observed. Microscopy of the hardened layer was used to analyse the occurrence of martensite shells or ledeburite shells around the graphite nodules in the ferrite matrix. The size of the shells was later supported by simple diffusion calculations.

Jezik:Angleški jezik
Ključne besede:laser surface remelting, nodular iron, microstructure, martensite shell, ledeburite shell
Vrsta gradiva:Delo ni kategorizirano (r6)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Leto izida:2002
Št. strani:str. 116-123
Številčenje:Vol. 187, no. 1/2
UDK:620.1/.2
ISSN pri članku:0169-4332
COBISS.SI-ID:5123355 Povezava se odpre v novem oknu
Število ogledov:530
Število prenosov:176
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Naslov:Applied Surface Science
Skrajšan naslov:Appl. surf. sci.
Založnik:North-Holland
ISSN:0169-4332
COBISS.SI-ID:3283215 Povezava se odpre v novem oknu

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