Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 626, Issue -, Pages 352-361Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.12.074
Keywords
Offshore platform steel; M-A constituent; Tempering; Low temperature toughness; Granular bainite
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Funding
- Fundamental Research Funds for the Central Universities [N120807001, N120407008]
- High Technology Research and Development Program of China [2007AA03Z504]
- Scientific Research Fund of Liaoning Provincial Education Department [L2013112]
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Granular bainite, where M-A constituents dispersed in bainitic ferrite matrix usually presents at the half thickness region in thermo-mechanically processed heavy gauge offshore platform steel. In the present work, the decomposition of M-A constituents during tempering at 600 degrees C was firstly revealed by transmission electron microscopy (TEM) analysis, which primarily involves the precipitation of cementite, recovery and recrystallization of highly dislocated ferrite matrix. Then, the effect of tempering on mechanical properties was investigated by tempering at different temperature for 60 min. Results indicated that, at tempering temperature of 500-600 degrees C, large quantity of microalloying carbides precipitated and partially compensated the loss of strength mainly due to the decomposition of M-A constituents. Compared with the as-rolled state, the decomposition of M-A constituents and softening of bainitic ferrite matrix after tempering have resulted in higher density of microvoids and substantial plastic deformation before impact failure. (C) 2014 Elsevier B.V. All rights reserved.
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