Mechanism and kinetics of solid-state transformation in high-temperature processed linepipe steel
P. Yan and H.K.D.H. Bhadeshia
Abstract
A relatively new class of linepipe steels with yield strength above 500 MPa created for thermomechanical processing at temperatures in excess of 1200°C has established a firm foothold in the market for modern, large diameter, and high pressure gas transmission systems. The design concept for the steels takes advantage of the enhanced role which higher levels of niobium can play in very low carbon steels, during the plate manufacturing process. The transformation products observed after cooling have been interpreted in conflicting ways in the literature, using ambiguous terms which are not established rigorously. Revealing characterisation-experiments have therefore been conducted to establish that the principal transformation product grows by a displacive transformation mechanism, and that it is properly identified as bainite. The implications of this, both on the interpretation of microstructure and on the processing of the steel, are discussed.
Metallurgical and Materials Transactions A 44 (2013) 5468-5477.
Download paper
Download data
Download image archive
Related papers
- "Prediction of the Microstructure of Submerged-Arc Linepipe Welds"
Proceedings of the Third International Conference on Welding
and Performance of Pipelines, 1986,
published by the Welding Institute, Abington, U.K.
H.K.D.H. Bhadeshia, L.-E. Svensson and B. Gretoft
- "Crystallographic Texture of Induction-welded and Heat-treated Pipeline Steel"
Advanced Materials Research, 89-91 (2009) 651-656.
P. Yan, Ö. E. Güngör, P. Thibaux and H. K. D. H. Bhadeshia
- "Induction welding and heat treatment of steel pipes: evolution of crystallographic texture detrimental to toughness"
Science and Technology of Welding and Joining, 15 (2010) 137-141.
P. Yan, Ö. E. Güngör, P. Thibaux and H. K. D. H. Bhadeshia
- "Air-Cooled Bainitic Steels for Strong, Seamless Pipes Part 1: Alloy Design, Kinetics and Microstructure"
Materials Science and Technology, 25 (2009) 1502-1507.
G. Gomez, T. Pérez and H. K. D. H. Bhadeshia
- "Air-Cooled Air-Cooled Bainitic Steels for Strong, Seamless Pipes
Part 2: Properties and Microstructure of Rolled Material"
Materials Science and Technology, 25 (2009) 1508-1512.
G. Gomez, T. Pérez and H. K. D. H. Bhadeshia
- "Investigations into the Microstructure-Toughness Relation in High-Frequency Induction-Welded Pipes"
8th International Pipeline Conference, 2010, published by the American Society of Mechanical Engineers, Alberta, Canada, IPC2010-31372, 1-9.
Ö. E. Güngör, P. Yan, P. Thibaux, M. Liebeherr, H. K. D. H. Bhadeshia and D. Quidort
- "Tackling the toughness of steel pipes produced by high frequency induction welding and heat-treatment"
Materials Science and Engineering A, 528 (2011) 8492-8499.
P. Yan, Ö. E. Güngör, P. Thibaux, M. Liebeherr and H. K. D. H. Bhadeshia
- "Experiments to Separate the Effect of Texture on Aniostropy of Pipeline Steel"
Materials Science and Engineering A 556 (2012) 601-606
M. S. Joo, D.-W. Suh, J. H. Bae, N. Sanchez Morino, R. Petrov, L. A. I. Kestens and H. K. D. H. Bhadeshia
- "Mechanical anisotropy of linepipe steels"
ISIJ International 53 (2013) 1305-1314
M. S. Joo, D.-W. Suh and H. K. D. H. Bhadeshia