Influence of the grain size on deleterious phase precipitation in superduplex stainless steel UNS S32750

Journal Article · Sun Mar 15 00:00:00 EDT 2009 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2008.08.007· OSTI ID:21192601

Pardal, J M ^[1]; Tavares, S S.M. , ^[1]; Fonseca, M Cindra; Souza, J.A. de; Corte, R R.A. ^[1]; Abreu, H F.G. de ^[2]

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1. Universidade Federal Fluminense, Departamento de Engenharia Mecanica, Rua Passo da Patria, 156-CEP 24210-240, Niteroi/Brazil (Brazil)
2. Universidade Federal do Ceara, Departamento de Engenharia Metalugica e de Materiais, Campus do Pici Bl. 702, Fortaleza, CE, CEP 60.455-760 (Brazil)

In the present work, the effect of grain size on deleterious phase precipitation in a superduplex stainless steel was investigated. The materials studied were heat treated isothermally at 800 deg. C, 850 deg. C and 900 deg. C for times up to 120 min. Hardness tests, light optical microscopy, scanning electron microscopy and X-ray diffraction were carried out to detect sigma and other harmful precipitate phases. The ferritic and austenitic grain sizes in the solution treated condition of the two steels analyzed were measured by electron backscattered diffraction (EBSD). Cyclic polarization corrosion tests were performed to evaluate the effect of grain size on the corrosion resistance. The results presented show that the precipitation of deleterious phases such as {chi}, {sigma} and {gamma}{sub 2}, which can occur during welding and forming operations, is retarded by grain growth.

• OSTI ID: 21192601
• Journal Information: Materials Characterization, Vol. 60, Issue 3; Other Information: DOI: 10.1016/j.matchar.2008.08.007; PII: S1044-5803(08)00239-8; Copyright (c) 2008 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

Related Subjects

36 MATERIALS SCIENCE
AUSTENITIC STEELS
BACKSCATTERING
CORROSION
CORROSION RESISTANCE
ELECTRON DIFFRACTION
FERRITIC STEELS
GRAIN GROWTH
GRAIN SIZE
HARDNESS
HEAT TREATMENTS
OPTICAL MICROSCOPY
POLARIZATION
PRECIPITATION
SCANNING ELECTRON MICROSCOPY
STAINLESS STEELS
TEMPERATURE RANGE 1000-4000 K
WELDING
X-RAY DIFFRACTION