Microstructural degradation in compound tubes

Jorma Salonen, Pertti Auerkari

Research output: Book/ReportReportProfessional

Abstract

In order to quantify microstructural degradation at high temperatures, samples of SA 210 / AISI 304 L compound tube material were annealed in the temperature range 540 - 720°C for 1 to 1 000 hours. The hardness of the annealed material was measured and the microstructure of the samples was investigated with optical and scanning electron microscopy. Microstructural degradation was characterised by the carbide structure in the ferritic-pearlitic base material and by the depth of decarburised and carburised zones of the compound tube interface. The observed changes were quantified in terms of their time and temperature dependence and diffusion coefficients of the process. The results can be used in estimating the extent of thermal exposure of high-temperature components after long-term service or after incidences of overheating.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages29
ISBN (Print)951-38-4937-6
Publication statusPublished - 1996
MoE publication typeNot Eligible

Publication series

NameVTT Publications
PublisherVTT
No.279
ISSN (Print)1235-0621
ISSN (Electronic)1455-0849

Fingerprint

degradation
tubes
carbides
time dependence
estimating
hardness
diffusion coefficient
incidence
temperature dependence
microstructure
scanning electron microscopy
coefficients
temperature

Keywords

  • microstructure
  • degradation
  • thermal degradation
  • tubes
  • temperature
  • materials
  • hardness
  • measurement
  • microscopes
  • carbides
  • carburizing

Cite this

Salonen, J., & Auerkari, P. (1996). Microstructural degradation in compound tubes. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 279
Salonen, Jorma ; Auerkari, Pertti. / Microstructural degradation in compound tubes. Espoo : VTT Technical Research Centre of Finland, 1996. 29 p. (VTT Publications; No. 279).
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abstract = "In order to quantify microstructural degradation at high temperatures, samples of SA 210 / AISI 304 L compound tube material were annealed in the temperature range 540 - 720°C for 1 to 1 000 hours. The hardness of the annealed material was measured and the microstructure of the samples was investigated with optical and scanning electron microscopy. Microstructural degradation was characterised by the carbide structure in the ferritic-pearlitic base material and by the depth of decarburised and carburised zones of the compound tube interface. The observed changes were quantified in terms of their time and temperature dependence and diffusion coefficients of the process. The results can be used in estimating the extent of thermal exposure of high-temperature components after long-term service or after incidences of overheating.",
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Salonen, J & Auerkari, P 1996, Microstructural degradation in compound tubes. VTT Publications, no. 279, VTT Technical Research Centre of Finland, Espoo.

Microstructural degradation in compound tubes. / Salonen, Jorma; Auerkari, Pertti.

Espoo : VTT Technical Research Centre of Finland, 1996. 29 p. (VTT Publications; No. 279).

Research output: Book/ReportReportProfessional

TY - BOOK

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AU - Salonen, Jorma

AU - Auerkari, Pertti

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Y1 - 1996

N2 - In order to quantify microstructural degradation at high temperatures, samples of SA 210 / AISI 304 L compound tube material were annealed in the temperature range 540 - 720°C for 1 to 1 000 hours. The hardness of the annealed material was measured and the microstructure of the samples was investigated with optical and scanning electron microscopy. Microstructural degradation was characterised by the carbide structure in the ferritic-pearlitic base material and by the depth of decarburised and carburised zones of the compound tube interface. The observed changes were quantified in terms of their time and temperature dependence and diffusion coefficients of the process. The results can be used in estimating the extent of thermal exposure of high-temperature components after long-term service or after incidences of overheating.

AB - In order to quantify microstructural degradation at high temperatures, samples of SA 210 / AISI 304 L compound tube material were annealed in the temperature range 540 - 720°C for 1 to 1 000 hours. The hardness of the annealed material was measured and the microstructure of the samples was investigated with optical and scanning electron microscopy. Microstructural degradation was characterised by the carbide structure in the ferritic-pearlitic base material and by the depth of decarburised and carburised zones of the compound tube interface. The observed changes were quantified in terms of their time and temperature dependence and diffusion coefficients of the process. The results can be used in estimating the extent of thermal exposure of high-temperature components after long-term service or after incidences of overheating.

KW - microstructure

KW - degradation

KW - thermal degradation

KW - tubes

KW - temperature

KW - materials

KW - hardness

KW - measurement

KW - microscopes

KW - carbides

KW - carburizing

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BT - Microstructural degradation in compound tubes

PB - VTT Technical Research Centre of Finland

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Salonen J, Auerkari P. Microstructural degradation in compound tubes. Espoo: VTT Technical Research Centre of Finland, 1996. 29 p. (VTT Publications; No. 279).