The effect of sulphide exposure on the mechanical behaviour of OFP copper

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

Abstract

A Japanese research group reported in 2008 susceptibility to stress corrosion cracking of oxygen free phosphorous doped copper (CuOFP) in sulphide containing sea water at T = 80°C and under uniaxial slow dynamical loading conditions. More evidence for stress corrosion cracking has not been found under multiaxial constant loading conditions in sulphide containing groundwater at T = 25°C. Indications of possible sulphur ingress to CuOFP grain boundaries from sulphide containing groundwater were found, which initiated further studies on the possibility of grain boundary embrittlement through such ingress. Further studies were conducted in order to clarify the effect of sulphide exposure on the mechanical behaviour of CuOFP. Tensile and creep tests were performed with specimens exposed to sulphide and reference specimens. In the studies presented in this paper only small con-centrations or no sulphur at all was found on fracture surfaces, in contradiction with earlier studies with precracked compact tension (CT) specimens under constant load. It is suggested that the high concentrations found earlier may have been caused by the method of opening up the fracture surfaces (i.e. post-exposure fatigue in air) and thus be an artefact. The tensile tests performed after the exposure to sulphide containing ground-water indicate a degrading influence of the exposure on mechanical properties of CuOFP. The result is based on adequate number of specimens and a standard test practise. The creep tests performed within the studies presented in this paper seem to indicate a minor degrading influence of the exposure to sulphide containing groundwater. However, when compared with all the publicly available creep data on CuOFP from different heats and laboratories the current finding is still within the scatter band.
Original languageEnglish
Title of host publicationBaltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts
EditorsPertti Auerkari, Juha Veivo
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages58
ISBN (Electronic)978-951-38-8030-9
ISBN (Print)978-951-38-8029-3
Publication statusPublished - 2013
MoE publication typeNot Eligible
EventBALTICA IX - International Conference on Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
Duration: 11 Jun 201313 Jun 2013

Publication series

NameVTT Technology
PublisherVTT
Number107
ISSN (Print)2242-1211
ISSN (Electronic)2242-122X

Conference

ConferenceBALTICA IX - International Conference on Life Management and Maintenance for Power Plants
CountryFinland
CityHelsinki-Stockholm
Period11/06/1313/06/13

Fingerprint

Copper
Groundwater
Creep
Stress corrosion cracking
Grain boundaries
Sulfur
Embrittlement
Sulfides
Fatigue of materials
Mechanical properties
Oxygen
Air
Water

Cite this

Sipilä, K., Arilahti, E., Lehtikuusi, T., Saario, T., & Varis, P. (2013). The effect of sulphide exposure on the mechanical behaviour of OFP copper. In P. Auerkari, & J. Veivo (Eds.), Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts (pp. 58). Espoo: VTT Technical Research Centre of Finland. VTT Technology, No. 107
Sipilä, Konsta ; Arilahti, Esko ; Lehtikuusi, Taru ; Saario, Timo ; Varis, Päivi. / The effect of sulphide exposure on the mechanical behaviour of OFP copper. Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts. editor / Pertti Auerkari ; Juha Veivo. Espoo : VTT Technical Research Centre of Finland, 2013. pp. 58 (VTT Technology; No. 107).
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abstract = "A Japanese research group reported in 2008 susceptibility to stress corrosion cracking of oxygen free phosphorous doped copper (CuOFP) in sulphide containing sea water at T = 80°C and under uniaxial slow dynamical loading conditions. More evidence for stress corrosion cracking has not been found under multiaxial constant loading conditions in sulphide containing groundwater at T = 25°C. Indications of possible sulphur ingress to CuOFP grain boundaries from sulphide containing groundwater were found, which initiated further studies on the possibility of grain boundary embrittlement through such ingress. Further studies were conducted in order to clarify the effect of sulphide exposure on the mechanical behaviour of CuOFP. Tensile and creep tests were performed with specimens exposed to sulphide and reference specimens. In the studies presented in this paper only small con-centrations or no sulphur at all was found on fracture surfaces, in contradiction with earlier studies with precracked compact tension (CT) specimens under constant load. It is suggested that the high concentrations found earlier may have been caused by the method of opening up the fracture surfaces (i.e. post-exposure fatigue in air) and thus be an artefact. The tensile tests performed after the exposure to sulphide containing ground-water indicate a degrading influence of the exposure on mechanical properties of CuOFP. The result is based on adequate number of specimens and a standard test practise. The creep tests performed within the studies presented in this paper seem to indicate a minor degrading influence of the exposure to sulphide containing groundwater. However, when compared with all the publicly available creep data on CuOFP from different heats and laboratories the current finding is still within the scatter band.",
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Sipilä, K, Arilahti, E, Lehtikuusi, T, Saario, T & Varis, P 2013, The effect of sulphide exposure on the mechanical behaviour of OFP copper. in P Auerkari & J Veivo (eds), Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts. VTT Technical Research Centre of Finland, Espoo, VTT Technology, no. 107, pp. 58, BALTICA IX - International Conference on Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 11/06/13.

The effect of sulphide exposure on the mechanical behaviour of OFP copper. / Sipilä, Konsta; Arilahti, Esko; Lehtikuusi, Taru; Saario, Timo; Varis, Päivi.

Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts. ed. / Pertti Auerkari; Juha Veivo. Espoo : VTT Technical Research Centre of Finland, 2013. p. 58 (VTT Technology; No. 107).

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

TY - CHAP

T1 - The effect of sulphide exposure on the mechanical behaviour of OFP copper

AU - Sipilä, Konsta

AU - Arilahti, Esko

AU - Lehtikuusi, Taru

AU - Saario, Timo

AU - Varis, Päivi

PY - 2013

Y1 - 2013

N2 - A Japanese research group reported in 2008 susceptibility to stress corrosion cracking of oxygen free phosphorous doped copper (CuOFP) in sulphide containing sea water at T = 80°C and under uniaxial slow dynamical loading conditions. More evidence for stress corrosion cracking has not been found under multiaxial constant loading conditions in sulphide containing groundwater at T = 25°C. Indications of possible sulphur ingress to CuOFP grain boundaries from sulphide containing groundwater were found, which initiated further studies on the possibility of grain boundary embrittlement through such ingress. Further studies were conducted in order to clarify the effect of sulphide exposure on the mechanical behaviour of CuOFP. Tensile and creep tests were performed with specimens exposed to sulphide and reference specimens. In the studies presented in this paper only small con-centrations or no sulphur at all was found on fracture surfaces, in contradiction with earlier studies with precracked compact tension (CT) specimens under constant load. It is suggested that the high concentrations found earlier may have been caused by the method of opening up the fracture surfaces (i.e. post-exposure fatigue in air) and thus be an artefact. The tensile tests performed after the exposure to sulphide containing ground-water indicate a degrading influence of the exposure on mechanical properties of CuOFP. The result is based on adequate number of specimens and a standard test practise. The creep tests performed within the studies presented in this paper seem to indicate a minor degrading influence of the exposure to sulphide containing groundwater. However, when compared with all the publicly available creep data on CuOFP from different heats and laboratories the current finding is still within the scatter band.

AB - A Japanese research group reported in 2008 susceptibility to stress corrosion cracking of oxygen free phosphorous doped copper (CuOFP) in sulphide containing sea water at T = 80°C and under uniaxial slow dynamical loading conditions. More evidence for stress corrosion cracking has not been found under multiaxial constant loading conditions in sulphide containing groundwater at T = 25°C. Indications of possible sulphur ingress to CuOFP grain boundaries from sulphide containing groundwater were found, which initiated further studies on the possibility of grain boundary embrittlement through such ingress. Further studies were conducted in order to clarify the effect of sulphide exposure on the mechanical behaviour of CuOFP. Tensile and creep tests were performed with specimens exposed to sulphide and reference specimens. In the studies presented in this paper only small con-centrations or no sulphur at all was found on fracture surfaces, in contradiction with earlier studies with precracked compact tension (CT) specimens under constant load. It is suggested that the high concentrations found earlier may have been caused by the method of opening up the fracture surfaces (i.e. post-exposure fatigue in air) and thus be an artefact. The tensile tests performed after the exposure to sulphide containing ground-water indicate a degrading influence of the exposure on mechanical properties of CuOFP. The result is based on adequate number of specimens and a standard test practise. The creep tests performed within the studies presented in this paper seem to indicate a minor degrading influence of the exposure to sulphide containing groundwater. However, when compared with all the publicly available creep data on CuOFP from different heats and laboratories the current finding is still within the scatter band.

M3 - Conference abstract in proceedings

SN - 978-951-38-8029-3

T3 - VTT Technology

SP - 58

BT - Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts

A2 - Auerkari, Pertti

A2 - Veivo, Juha

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Sipilä K, Arilahti E, Lehtikuusi T, Saario T, Varis P. The effect of sulphide exposure on the mechanical behaviour of OFP copper. In Auerkari P, Veivo J, editors, Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts. Espoo: VTT Technical Research Centre of Finland. 2013. p. 58. (VTT Technology; No. 107).