Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 596, Issue -, Pages 9-14Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.11.097
Keywords
Steel; Thermomechanical processing; Martensitic transformations; Microstructure; Hardness
Categories
Funding
- National Natural Science Foundations [51071137, 50925522]
- Natural Science Foundation-Steel and Iron Foundation of Hebei Province, PR China [E2011203136]
- National High Technology Research and Development Program of China (863 Program) [2012AA03A504]
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Deformation behavior of austenite/supercooled austenite in a medium-carbon Si-Al-rich alloy steel is investigated on a thermomechanical simulator and an optical microscope. Effects of ausforming temperature, strain rate and strain on martensite start temperature (M-S) and ausformed martensite microstructure are studied in detail. Results show that power-law-type work hardening is caused during supercooled austenite deformation at 300 degrees C; and the work hardening followed by steady-state flow is caused during the deformation at 600 and 900 degrees C. The ausforming can decrease M-S, refined lath martensitic microstructure and slightly enhanced hardness. With decreasing the ausforming temperature the M-S and martensite lath thickness decrease markedly. The strain and strain rate do not have strong effects on the M-S and lath thickness. In addition, the ausforming can decrease the tetragonality of martensite and facilitate the formation of dislocation substructured martensite. (C) 2013 Elsevier B.V. All rights reserved.
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