Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 669, Issue -, Pages 387-395Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.05.106
Keywords
Quenching and partitioning steel; Fast-heating; Microstructure; Retained austenite; Mechanical property
Categories
Funding
- National Twelfth Five-year Science and Technology Support Program of China [2011BAE13B01, 2011BAE13B03]
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In this study, fast-heating (300 degrees C/s) was applied to achieve the intercritical annealing of a cold-rolled quenching and partitioning (Q&P) steel with a wide range of soaking temperature (770-850 degrees C) and soaking time (0-120 s) for austenitization. The dilatometry and microstructural analysis revealed that in contrast to the conventional heating rate (5 degrees C/s), a fast-heating rate led to an accelerated transformation and grain refinement of the prior austenite in the Q&P samples. The microstructures of the Q&P treated samples subjected to different intercritical annealing conditions were studied in detail by various material characterization techniques including electron microscopy, electron probe micro-analysis, and X-ray diffraction. The working hardening behavior and the mechanical stability of the retained austenite were discussed on the basis of the typical stress-strain curves. The statistics of the ultimate tensile strength vs. total elongation of each sample under the orthogonal annealing conditions suggest that, for the investigated steel, the fast-heating process improved the strength with approximately 90 MPa on average within the elongation ranged from 17 to 27%. (C) 2016 Elsevier B.V. All rights reserved.
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