Artículos de revistas
Precipitation of Laves phase in a 28%Cr-4%Ni-2%Mo-Nb superferritic stainless steel
Fecha
2008Registro en:
MATERIALS CHARACTERIZATION, v.59, n.5, p.503-507, 2008
1044-5803
10.1016/j.matchar.2007.03.006
Autor
ANDRADE, Thiago Fontoura de
KLIAUGA, Andrea Madeira
PLAUT, Ronald Lesley
PADILHA, Angelo Fernando
Institución
Resumen
The main objective of the present work was to study the precipitation of the Laves phase in the X1 CrNiMoNb 28 4 2 (Werkstoff-Nr. DIN 1.4575) superferritic stainless steel employing several complementary techniques of microstructural analysis. The phase that precipitated in largest quantity in the DIN 1.4575 steel was the sigma (sigma) phase. However, along grain boundaries, after aging at 850 degrees C, a Laves phase of the MgZn2 type, with a hexagonal C14 crystal structure and chemical composition (Fe,Cr,Ni)(2)(Nb,Mo,Si), was also identified. Growth of the Laves phase is curtailed by exhaustion of niobium of the matrix and by the presence of the sigma phase, which also precipitates in the vicinity of the grain boundaries, however in larger amounts. No chi (chi) or austenite phases were detected in the temperature range studied. (C) 2007 Elsevier Inc. All rights reserved.