Artículos de revistas
Intragranular formation of austenite during delta ferrite decomposition in a duplex stainless steel
Fecha
2010Registro en:
JOURNAL OF MATERIALS SCIENCE, v.45, n.18, p.5089-5093, 2010
0022-2461
10.1007/s10853-010-4468-6
Autor
MONLEVADE, Eduardo Franco de
GOLDENSTEIN, Helio
FALLEIROS, Ivan Gilberto Sandoval
Institución
Resumen
A Fe-22.5%Cr-4.53%Ni-3.0%Mo duplex stainless steel was solution treated at 1,325 A degrees C for 1 h, quenched in water and isothermally treated at 900 A degrees C for 5,000 s. The crystallography of austenite was studied using EBSD technique. Intragranular austenite particles formed from delta ferrite are shown to nucleate on inclusions, and to be subdivided in twin-related sub-particles. Intragranular austenite appears to have planar-only orientation relationships with the ferrite matrix, close to Kurdjumov-Sachs and Nishyiama-Wassermann, but not related to a conjugate direction. Samples treated at 900 A degrees C underwent sparse formation of sigma phase and pronounced growth of elongated austenite particles, very similar to acicular ferrite.