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Rapid thermomechanical tempering of iron–carbon martensite

Krste Cvetkovski (Institutionen för material- och tillverkningsteknik, Materialteknologi) ; Johan Ahlström (Institutionen för material- och tillverkningsteknik, Materialteknologi) ; Christer Persson (Institutionen för material- och tillverkningsteknik, Materialteknologi)
Materials Science and Technology (0267-0836). Vol. 30 (2014), 14, p. 1832-1834.
[Artikel, refereegranskad vetenskaplig]

Tempering of martensite under simultaneous compressive stress has been studied within the temperature range of 20–400 deg C. Resistive heating was utilised to obtain rapid heating and cooling cycles of a few seconds. Material was obtained from a medium carbon pearlitic railway wheel steel, quench hardened to obtain martensitic structure. Above approx 150 deg C dilatation effects were observed below the global yielding point of the material. Microstraining around dislocations in the body centred tetragonal crystallographic structure or viscous flow at higher temperatures was a probable explanation to this material behaviour. Hence, external stress may have an important influence on the tempering progression of martensitic steel. The trials also showed that tempering of martensite progresses fast, is near instantaneous and is independent of the presence of external stress or not.

Nyckelord: Martensite, Tempering, Prestress, Resistive flash heating, Railway

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Denna post skapades 2014-11-26. Senast ändrad 2015-02-26.
CPL Pubid: 206623


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