Ultrasonic assessment of material degradation by thermal fatigue

Jorma Pitkänen, Pentti Kauppinen, Harri Jeskanen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

Near surface areas can contain many types of defects, material changes and degradation. Materials subjected to thermal fatigue or annealing have been evaluated with a special ultrasonic probe optimised for surface measurements, and with a 0 longitudinal wave probe. Combining measured data from a large area and calculating depths of interest in the sound path (RF-signal) information provides improved estimation of degradation levels. The technique is using a combination of three factors: (1) back-scattered ultrasonic signals and induced leaky Rayleigh wave information), and (2) simple statistical data analysis in combination with (3) an optimised ultrasonic transducer. The back-scattered ultrasonic signal is a measure of the effect of geometrical reflectors such as micro-pores, inclusions, precipitates, segregation, micro-cracks and cracks as well as of back-scattering from phase boundaries during fatigue damaging and increase of degradation inside the material. The leaky Rayleigh wave component is sensitive to surface properties, and especially to cracks. Deep cracks will totally cancel the leaky Rayleigh wave signal.
Original languageEnglish
Title of host publicationBALTICA VI - Life management and maintenance for power plants. Vol. 2
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages681-686
ISBN (Electronic)951-38-6294-1
ISBN (Print)951-38-6293-3
Publication statusPublished - 2004
MoE publication typeB3 Non-refereed article in conference proceedings
EventBALTICA VI - Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
Duration: 8 Jun 200410 Jun 2004

Publication series

SeriesVTT Symposium
Number234
ISSN0357-9387

Conference

ConferenceBALTICA VI - Life Management and Maintenance for Power Plants
CountryFinland
CityHelsinki-Stockholm
Period8/06/0410/06/04

Fingerprint

thermal fatigue
Rayleigh waves
cracks
ultrasonics
degradation
probes
longitudinal waves
surface properties
reflectors
precipitates
transducers
inclusions
porosity
annealing
acoustics
defects
scattering

Cite this

Pitkänen, J., Kauppinen, P., & Jeskanen, H. (2004). Ultrasonic assessment of material degradation by thermal fatigue. In BALTICA VI - Life management and maintenance for power plants. Vol. 2 (pp. 681-686). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 234
Pitkänen, Jorma ; Kauppinen, Pentti ; Jeskanen, Harri. / Ultrasonic assessment of material degradation by thermal fatigue. BALTICA VI - Life management and maintenance for power plants. Vol. 2. Espoo : VTT Technical Research Centre of Finland, 2004. pp. 681-686 (VTT Symposium; No. 234).
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Pitkänen, J, Kauppinen, P & Jeskanen, H 2004, Ultrasonic assessment of material degradation by thermal fatigue. in BALTICA VI - Life management and maintenance for power plants. Vol. 2. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 234, pp. 681-686, BALTICA VI - Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 8/06/04.

Ultrasonic assessment of material degradation by thermal fatigue. / Pitkänen, Jorma; Kauppinen, Pentti; Jeskanen, Harri.

BALTICA VI - Life management and maintenance for power plants. Vol. 2. Espoo : VTT Technical Research Centre of Finland, 2004. p. 681-686 (VTT Symposium; No. 234).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

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AB - Near surface areas can contain many types of defects, material changes and degradation. Materials subjected to thermal fatigue or annealing have been evaluated with a special ultrasonic probe optimised for surface measurements, and with a 0 longitudinal wave probe. Combining measured data from a large area and calculating depths of interest in the sound path (RF-signal) information provides improved estimation of degradation levels. The technique is using a combination of three factors: (1) back-scattered ultrasonic signals and induced leaky Rayleigh wave information), and (2) simple statistical data analysis in combination with (3) an optimised ultrasonic transducer. The back-scattered ultrasonic signal is a measure of the effect of geometrical reflectors such as micro-pores, inclusions, precipitates, segregation, micro-cracks and cracks as well as of back-scattering from phase boundaries during fatigue damaging and increase of degradation inside the material. The leaky Rayleigh wave component is sensitive to surface properties, and especially to cracks. Deep cracks will totally cancel the leaky Rayleigh wave signal.

M3 - Conference article in proceedings

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BT - BALTICA VI - Life management and maintenance for power plants. Vol. 2

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Pitkänen J, Kauppinen P, Jeskanen H. Ultrasonic assessment of material degradation by thermal fatigue. In BALTICA VI - Life management and maintenance for power plants. Vol. 2. Espoo: VTT Technical Research Centre of Finland. 2004. p. 681-686. (VTT Symposium; No. 234).