NDLI: Effect of Cooling Rate on the Microstructure and Mechanical Properties of Fe-Mn-Al-C Light-Weight Steels

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Effect of Cooling Rate on the Microstructure and Mechanical Properties of Fe-Mn-Al-C Light-Weight Steels

Content Provider	Semantic Scholar
Author	Park, Jun Young Park, Seongjun Lee, Jae-Hyun Moon, Joonoh Lee, Tae-Ho Jeong, Kyeong Jae Han, Heung Nam Shin, Jong-Ho
Copyright Year	2017
Abstract	The effects of cooling after solution heat treatment on the microstructure and mechanical properties of light-weight steels were investigated using Fe-30Mn-xAl-0.9C alloys containing 9.0–12.8 wt% Al. Lab-scale specimens (thickness: 10 mm) of the alloys were cooled by different cooling rates from -337 to -0.053 °C/s using water, air, and furnace cooling. As the cooling rate decreased, hardness of the alloys increased due to precipitation of κ-carbides. However, reduction of the cooling rate induced the growth of intergranular κ-carbides. This resulted in the decrease of impact absorbed energy of the alloys at room temperature, and exhibited intergranular brittle fracture behavior. The 12.8 wt% Al alloy cooled at the slowest cooling rate in particular showed the formation of β-Mn. To estimate the cooling rates of large-scale slabs of light-weight steels, finite element simulations were conducted. The cooling rates at the center of the slab under air and water cooling (free convection) were calculated to be -0.049 and -0.15 °C/s, respectively. The results indicated that water cooling could prevent the excessive formation of κ-carbides/β-Mn during fabrication of large-scale slabs of alloys containing an Al content lower than 10.5 wt%. †(Received September 1, 2017; Accepted September 20, 2017)
Starting Page	825
Ending Page	835
Page Count	11
File Format	PDF HTM / HTML
DOI	10.3365/kjmm.2017.55.12.825
Volume Number	55
Alternate Webpage(s)	http://kjmm.org/upload/pdf/KJMM-2017-55-12-825.pdf
Alternate Webpage(s)	https://doi.org/10.3365/kjmm.2017.55.12.825
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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