Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 573, Issue -, Pages 84-91Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.02.056
Keywords
Precipitation; HSLA steel; TiC; Molybdenum; HRTEM
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Funding
- National Basic Research Program of China (973 Program) [2010CB630805]
- National Natural Science Foundation of China [51171087]
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The carbide precipitation behavior in austenite of a 0.04%C-0.10%Ti-0.21% Mo micro-alloyed steel was investigated by the stress relaxation method and transmission electron microscopy. Results showed that the precipitation-time-temperature diagram for carbide precipitation exhibited a typical C curve, the nose of which was located at about 925 degrees C The carbide was identified as a (Ti, Mo)C particle with a NaCl-type crystal structure that contains a certain amount of Mo. As compared with TiC particle in Ti steel, (Ti, Mo)C particle in Ti-Mo steel exhibits a superior coarsening resistance during the coarsening stage. The fraction of Mo in (Ti, Mo)C particle decreases with isothermal holding time or particle growing, indicating that the high level replacement of Ti by Mo in TiC lattice is in a metastable state with respect to the equilibrium precipitation of (Ti, Mo)C in austenite. (C) 2013 Elsevier B.V. All rights reserved.
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