Microstructural degradation of boiler tube steels under long term exposure to high temperature

Jorma Salonen, Pertti Auerkari

Research output: Book/ReportReport

1 Citation (Scopus)

Abstract

Thermal microstructural degradation was investigated by isothermal annealing of samples from boiler tube steels St 35.8, 15 Mo 3, 13 CrMo 44, 10 CrMo 9 10 and X20 CrMoV 12 1 in the temperature range 600 - 780°C for up to 2 000 h. Optical and scanning electron microscopy and hardness testing were used for characterising the microstructural changes and their time-temperature dependence. The results suggest a simple and consistent time-temperature dependence for all investigated materials, expected to apply also to long term service beyond the annealing time range of the present work. This would allow assessment of the in-service thermal exposure from the observed microstructure. A collection of micrographs has been prepared for this purpose, to aid in classifying and evaluating the observed microstructural state in terms of isothermal exposure to high temperature.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages69
ISBN (Print)951-38-4938-4
Publication statusPublished - 1996
MoE publication typeNot Eligible

Publication series

SeriesVTT Publications
Number280
ISSN1235-0621

Fingerprint

boilers
time dependence
steels
degradation
tubes
temperature dependence
annealing
thermal degradation
classifying
hardness
microstructure
scanning electron microscopy
temperature

Keywords

  • microstructure
  • hardness
  • tests
  • degradation
  • thermal degradation
  • boilers
  • tubes
  • steels
  • temperature
  • microscopy
  • photomicrographs
  • classifying

Cite this

Salonen, J., & Auerkari, P. (1996). Microstructural degradation of boiler tube steels under long term exposure to high temperature. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 280
Salonen, Jorma ; Auerkari, Pertti. / Microstructural degradation of boiler tube steels under long term exposure to high temperature. Espoo : VTT Technical Research Centre of Finland, 1996. 69 p. (VTT Publications; No. 280).
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abstract = "Thermal microstructural degradation was investigated by isothermal annealing of samples from boiler tube steels St 35.8, 15 Mo 3, 13 CrMo 44, 10 CrMo 9 10 and X20 CrMoV 12 1 in the temperature range 600 - 780°C for up to 2 000 h. Optical and scanning electron microscopy and hardness testing were used for characterising the microstructural changes and their time-temperature dependence. The results suggest a simple and consistent time-temperature dependence for all investigated materials, expected to apply also to long term service beyond the annealing time range of the present work. This would allow assessment of the in-service thermal exposure from the observed microstructure. A collection of micrographs has been prepared for this purpose, to aid in classifying and evaluating the observed microstructural state in terms of isothermal exposure to high temperature.",
keywords = "microstructure, hardness, tests, degradation, thermal degradation, boilers, tubes, steels, temperature, microscopy, photomicrographs, classifying",
author = "Jorma Salonen and Pertti Auerkari",
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year = "1996",
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Salonen, J & Auerkari, P 1996, Microstructural degradation of boiler tube steels under long term exposure to high temperature. VTT Publications, no. 280, VTT Technical Research Centre of Finland, Espoo.

Microstructural degradation of boiler tube steels under long term exposure to high temperature. / Salonen, Jorma; Auerkari, Pertti.

Espoo : VTT Technical Research Centre of Finland, 1996. 69 p. (VTT Publications; No. 280).

Research output: Book/ReportReport

TY - BOOK

T1 - Microstructural degradation of boiler tube steels under long term exposure to high temperature

AU - Salonen, Jorma

AU - Auerkari, Pertti

N1 - Project code: VAL45023

PY - 1996

Y1 - 1996

N2 - Thermal microstructural degradation was investigated by isothermal annealing of samples from boiler tube steels St 35.8, 15 Mo 3, 13 CrMo 44, 10 CrMo 9 10 and X20 CrMoV 12 1 in the temperature range 600 - 780°C for up to 2 000 h. Optical and scanning electron microscopy and hardness testing were used for characterising the microstructural changes and their time-temperature dependence. The results suggest a simple and consistent time-temperature dependence for all investigated materials, expected to apply also to long term service beyond the annealing time range of the present work. This would allow assessment of the in-service thermal exposure from the observed microstructure. A collection of micrographs has been prepared for this purpose, to aid in classifying and evaluating the observed microstructural state in terms of isothermal exposure to high temperature.

AB - Thermal microstructural degradation was investigated by isothermal annealing of samples from boiler tube steels St 35.8, 15 Mo 3, 13 CrMo 44, 10 CrMo 9 10 and X20 CrMoV 12 1 in the temperature range 600 - 780°C for up to 2 000 h. Optical and scanning electron microscopy and hardness testing were used for characterising the microstructural changes and their time-temperature dependence. The results suggest a simple and consistent time-temperature dependence for all investigated materials, expected to apply also to long term service beyond the annealing time range of the present work. This would allow assessment of the in-service thermal exposure from the observed microstructure. A collection of micrographs has been prepared for this purpose, to aid in classifying and evaluating the observed microstructural state in terms of isothermal exposure to high temperature.

KW - microstructure

KW - hardness

KW - tests

KW - degradation

KW - thermal degradation

KW - boilers

KW - tubes

KW - steels

KW - temperature

KW - microscopy

KW - photomicrographs

KW - classifying

M3 - Report

SN - 951-38-4938-4

T3 - VTT Publications

BT - Microstructural degradation of boiler tube steels under long term exposure to high temperature

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Salonen J, Auerkari P. Microstructural degradation of boiler tube steels under long term exposure to high temperature. Espoo: VTT Technical Research Centre of Finland, 1996. 69 p. (VTT Publications; No. 280).