Grain boundary segregation in austenitic stainless steels

Hannu Hänninen, Erkki Minni

Research output: Book/ReportReportProfessional

Abstract

Impurity segregation in austenitic stainless steels has usually been studied by using surface heating experiments in Auger electron spectrometer. Although direct studies of grain boundary segregation would be preferable, there is a difficulty of achieving intergranular fracture in these ductile materials in the Auger electron spectrometer. After hydrogen charging of the specimens the grain boundaries of sensitized austenitic stainless steels can be broken up. The compositions of grain boundaries in two sensitized austenitic stainless steels (AISI 304 and AISI 321) are obtained. Also the depth distribution of segregated species will be given, depicting the layered segregation profiles of phosphorus and sulfur. An example of impurity segregation at the interdendritic fracture surface of a hot crack in an austenitic stainless steel weld is also presented. Segregations of S, Nb and P are observed.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages25
ISBN (Print)951-38-1315-0
Publication statusPublished - 1981
MoE publication typeD4 Published development or research report or study

Publication series

NameTutkimuksia / Valtion teknillinen tutkimuskeskus
PublisherVTT
Volume32
ISSN (Print)0358-5077

Fingerprint

austenitic stainless steels
grain boundaries
spectrometers
impurities
charging
phosphorus
electrons
sulfur
cracks
heating
hydrogen
profiles

Keywords

  • austenitic stainless steels
  • grain boundaries
  • segregation
  • sensitizing
  • hot cracking
  • intergranular corrosion

Cite this

Hänninen, H., & Minni, E. (1981). Grain boundary segregation in austenitic stainless steels. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 32
Hänninen, Hannu ; Minni, Erkki. / Grain boundary segregation in austenitic stainless steels. Espoo : VTT Technical Research Centre of Finland, 1981. 25 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 32).
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Hänninen, H & Minni, E 1981, Grain boundary segregation in austenitic stainless steels. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 32, VTT Technical Research Centre of Finland, Espoo.

Grain boundary segregation in austenitic stainless steels. / Hänninen, Hannu; Minni, Erkki.

Espoo : VTT Technical Research Centre of Finland, 1981. 25 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 32).

Research output: Book/ReportReportProfessional

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N2 - Impurity segregation in austenitic stainless steels has usually been studied by using surface heating experiments in Auger electron spectrometer. Although direct studies of grain boundary segregation would be preferable, there is a difficulty of achieving intergranular fracture in these ductile materials in the Auger electron spectrometer. After hydrogen charging of the specimens the grain boundaries of sensitized austenitic stainless steels can be broken up. The compositions of grain boundaries in two sensitized austenitic stainless steels (AISI 304 and AISI 321) are obtained. Also the depth distribution of segregated species will be given, depicting the layered segregation profiles of phosphorus and sulfur. An example of impurity segregation at the interdendritic fracture surface of a hot crack in an austenitic stainless steel weld is also presented. Segregations of S, Nb and P are observed.

AB - Impurity segregation in austenitic stainless steels has usually been studied by using surface heating experiments in Auger electron spectrometer. Although direct studies of grain boundary segregation would be preferable, there is a difficulty of achieving intergranular fracture in these ductile materials in the Auger electron spectrometer. After hydrogen charging of the specimens the grain boundaries of sensitized austenitic stainless steels can be broken up. The compositions of grain boundaries in two sensitized austenitic stainless steels (AISI 304 and AISI 321) are obtained. Also the depth distribution of segregated species will be given, depicting the layered segregation profiles of phosphorus and sulfur. An example of impurity segregation at the interdendritic fracture surface of a hot crack in an austenitic stainless steel weld is also presented. Segregations of S, Nb and P are observed.

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Hänninen H, Minni E. Grain boundary segregation in austenitic stainless steels. Espoo: VTT Technical Research Centre of Finland, 1981. 25 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 32).