Boundary characterisation of X65 pipeline steel using analytical electron microscopy

Wang, JQ, Atrens, A, Cousens, DR, Nockolds, C and Bulcock, S (1999) Boundary characterisation of X65 pipeline steel using analytical electron microscopy. Journal of Materials Science, 34 8: 1711-1719. doi:10.1023/A:1004530420338


Author Wang, JQ
Atrens, A
Cousens, DR
Nockolds, C
Bulcock, S
Title Boundary characterisation of X65 pipeline steel using analytical electron microscopy
Journal name Journal of Materials Science   Check publisher's open access policy
ISSN 0022-2461
Publication date 1999
Sub-type Article (original research)
DOI 10.1023/A:1004530420338
Volume 34
Issue 8
Start page 1711
End page 1719
Total pages 9
Place of publication Dordrecht
Publisher Kluwer
Collection year 1999
Language eng
Subject C1
291302 Physical Metallurgy
780102 Physical sciences
Abstract Analytical electron microscopy was used to characterise grain boundaries (GBs) and interphase boundaries (IBs) of X65 pipeline steel. There was no segregation of P or S at the proeutectoid ferrite GBs. This indicates that contrary to literature expectations, P and S are unlikely to be involved in the mechanism of SCC of pipeline steels. There was Mn segregation at IBs between pro-eutectoid ferrite and pearlitic cementite, and desegregated from the IBs between pro-eutectoid ferrite and pearlitic ferrite. This pattern of Mn segregation is attributed to diffusion in the process zone ahead of the pearlite during the austenite to pearlite transformation and diffusion in the IBs between the proeutectoid ferrite and pearlite. A new mechanism was proposed for pearlite formation. A GB carbide first forms at an a! : a GB, and then grows along the alpha/gamma interface. Subsequently pearlite initiates from this interface carbide. (C) 1999 Kluwer Academic Publishers.
Keyword Materials Science, Multidisciplinary
Stress-corrosion Cracking
Carbonate-bicarbonate Solution
High-strength Steels
Distilled Water
Initiation
Fracture
Propagation
Carbides
Growth
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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