期刊
METALS
卷 9, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/met9090997
关键词
grain growth; kinetics; austenitic steel; mechanical properties; low density steel
资金
- Congressional support through the Combat Vehicle Weight Reduction Initiative
- U.S. Army Combat Capabilities Development Command Army Research Laboratory [W911NF-18-2-0046]
The grain growth kinetics of an age-hardenable Fe-Mn-Al-C steel were investigated. Kinetics of grain growth were determined between 1173 and 1348 K (900-1075 degrees C) to obtain a range of grain sizes from 30 to 475 mu m. It was found that grain growth was negligible at 1173 K (900 degrees C) for times up to 15 h. The activation energy for grain growth was found to be 467 kJ/mol. The hardness and mean linear intercept (L3) were correlated to follow a traditional Hall-Petch relationship. Tensile properties of the alloy were determined after various solution treatments performed for 2 h followed by water quenching. Tensile strength increased from 810 to 960 MPa and ductility was reduced from 80 to 60% as the grain size decreased from 200 mu m to 30 mu m as grain coarsening was mitigated by lowering the solution treatment temperature.
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