Abstract
We investigated microstructures and solidification modes of cast Fe-(13-27)Mn-5.5Si-8.5Cr-5Ni shape memory alloys to clarify whether Mn was an austenite former during solidification. Furthermore, we examined whether the Creq/Nieq equations (Delong, Hull, Hammer and WRC-1992 equations) and Thermo-Calc software® together with database TCFE6 were valid to predict the solidification modes of cast Fe-(13-27)Mn-5.5Si-8.5Cr-5Ni shape memory alloys. The results have shown that the solidification modes of Fe-(13-27)Mn-5.5Si-8.5Cr-5Ni alloys changed from the F mode to the FA mode with increasing the Mn concentration. Mn is an austenite former during the solidification for the cast Fe-Mn-Si-Cr-Ni shape memory alloys. The Delong, Hull, Hammer, and WRC-1992 equations as well as Thermo-Calc software® together with database TCFE6 are invalid to predict the solidification modes of cast Fe-(13-27)Mn-5.5Si-8.5Cr-5Ni SMAs. To predict the solidification modes of cast Fe-Mn-Si-Cr-Ni alloys, a new Creq/Nieq equation should be developed or the thermodynamic database of Thermo-Calc software® should be corrected.
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Acknowledgments
The work was supported by the National Natural Science Foundation of China (Nos. 50871072, 50971095, and 51171123), the Natural Science Foundation for Young Scientists of Sichuan Province in China (No. 2010A01-436), and the Fundamental Research Funds for the Central Universities (No. 2012SCU11068). We are very grateful to Dr. Lijun Zhang of the Interdisciplinary Centre for Advanced Materials Simulation (ICAMS) for supplying the thermodynamic calculation.
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Manuscript submitted March 22, 2013.
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Peng, H., Wen, Y., Du, Y. et al. Effect of Manganese on Microstructures and Solidification Modes of Cast Fe-Mn-Si-Cr-Ni Shape Memory Alloys. Metall Mater Trans B 44, 1137–1143 (2013). https://doi.org/10.1007/s11663-013-9880-2
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DOI: https://doi.org/10.1007/s11663-013-9880-2