Precipitation of Laves phase in a 28%Cr-4%Ni-2%Mo-Nb superferritic stainless steel
- Department of Metallurgical and Materials Engineering, University of S. Paulo, Av. Prof. Mello Moraes 2463, CEP 05508-900, S. Paulo (Brazil)
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 deg. C, a Laves phase of the MgZn{sub 2} type, with a hexagonal C14 crystal structure and chemical composition (Fe,Cr,Ni){sub 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.
- OSTI ID:
- 21062221
- Journal Information:
- Materials Characterization, Vol. 59, Issue 5; Other Information: DOI: 10.1016/j.matchar.2007.03.006; PII: S1044-5803(07)00099-X; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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