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Title: The use of X-ray diffraction, microscopy, and magnetic measurements for analysing microstructural features of a duplex stainless steel

X-ray diffraction, light optical microscopy, and magnetization saturation measurements were employed to analyse the microstructural features of a UNS S31803 duplex stainless steel modified by high-temperature treatments. The samples were heated to 1300 deg. C and cooled by different ways to produce five different microstructures. Solution treatments at 1000 deg. C were also employed to produce another five conditions. Three methods were employed to determine the austenite/ferrite proportions. X-ray diffraction gave higher austenite values than the other methods, due to the influence of texture, but can be successfully used to determine the microstrain level in each phase. Magnetic saturation measurement is a very simple and precise method for quantification of austenite and ferrite volume fractions in samples that were fast-cooled and slow-cooled. Light microscopy can give a fast and precise measurement of the phase proportions and reveals important features related to the morphology of the phases, but in the samples where the austenite content is low, quantification becomes difficult and imprecise.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Instituto de Fisica, Universidade Federal do Ceara, Campus do Pici, Caixa Postal 6030, CEP 60455-760 Fortaleza/CE (Brazil). E-mail: marcus@fisica.ufc.br
  2. Instituto de Fisica, Universidade Federal do Ceara, Campus do Pici, Caixa Postal 6030, CEP 60455-760 Fortaleza/CE (Brazil)
  3. PGMEC/TEM, Universidade Federal Fluminense, Rua Passo da Patria, 156, CEP 24210-240, Niteroi/RJ (Brazil)
  4. Depto. Engenharia Meca-hat nica, Universidade Federal do Ceara (Brazil)
  5. Instituto de Fisica, Universidade Federal do Rio de Janeiro (Brazil)
Publication Date:
OSTI Identifier:
20748750
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 54; Journal Issue: 4-5; Other Information: DOI: 10.1016/j.matchar.2004.12.009; PII: S1044-5803(05)00011-2; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AUSTENITE; FERRITE; MAGNETIZATION; MICROSTRUCTURE; MORPHOLOGY; OPTICAL MICROSCOPY; SATURATION; SOLUTIONS; STAINLESS STEELS; TEMPERATURE RANGE 1000-4000 K; TEXTURE; X-RAY DIFFRACTION