Study of Hot Formability of High Nitrogen Martensitic Stainless Steel

Abstract:

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Alloying high-chromium steels with Nitrogen leads to increase in strength, fatigue life and corrosion resistance, but reduce ductility and could induce cracks formation during forging. In order to address these problems, the hot working response of a high Nitrogen martensitic stainless steel (Fe-16.2%Cr-1.1%Mo-0.33%N-0.34%C) has been investigated by means of hot torsion tests up to rupture, in the temperature and strain rate ranges of 900-1200°C and 0.005-5 s-1 respectively. The peak stresses of the flow curves were related to strain rate (e&) and temperature (T) by the well known sinh equation. The ductility and the safe working conditions were presented in terms of processing map. The microstructure of the steel in the quenched state after deformation was analyzed by means of optical microscopy; the differences in term of morphology and distribution of the various constituents were discussed.

Info:

Periodical:

Materials Science Forum (Volumes 604-605)

Edited by:

Marcello Cabibbo and Stefano Spigarelli

Pages:

279-284

DOI:

10.4028/www.scientific.net/MSF.604-605.279

Citation:

M. El Mehtedi "Study of Hot Formability of High Nitrogen Martensitic Stainless Steel", Materials Science Forum, Vols. 604-605, pp. 279-284, 2009

Online since:

October 2008

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Price:

$35.00

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