On the Grain Growth Kinetics of a Low Density Steel

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 °C) to obtain a range of grain sizes from 30 to 475 μm. It was found that grain growth was negligible at 1173 K (900 °C) for times up to 15 h....

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Bibliographic Details
Published in:Metals (Basel ) 2019-09, Vol.9 (9), p.997
Main Authors: Field, Daniel M., Limmer, Krista R., Hornbuckle, Billy C.
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Annealing
austenitic steel
Carbon
Cold
Ductility
Grain boundaries
Grain growth
Grain size
Hot rolling
Investigations
Iron
Kinetics
low density steel
Manganese
Mechanical properties
Precipitation hardening steels
Quench hardenability
Solution heat treatment
Steel
Temperature
Tensile properties
Tensile strength
Water quenching
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Summary: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 °C) to obtain a range of grain sizes from 30 to 475 μm. It was found that grain growth was negligible at 1173 K (900 °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 μm to 30 μm as grain coarsening was mitigated by lowering the solution treatment temperature.
ISSN:2075-4701
2075-4701
DOI:10.3390/met9090997