Abstract
High-temperature tensile properties of austenitic cast steels fabricated by replacing Ni by Mn in a 20 wt pct Ni-containing steel were investigated. In a steel where 8 wt pct Ni was replaced by 9.2 wt pct of Mn, 17.4 and 9.8 pct of ferrite existed in equilibrium phase diagrams and actual microstructures, respectively, because a role of Mn as an austenite stabilizer decreased, and led to deterioration of high-temperature properties. When 2 to 6 wt pct Ni was replaced by 2.3 to 6.9 wt pct Mn, high-temperature properties were comparable to those of the 20 wt pct Ni-containing steel because ferrites were absent, which indicated the successful replacement of 6 wt pct Ni by Mn, with cost reduction of 27 pct.
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This work was supported by the World Class 300 Project R&D Program under a Grant No. 10050290-2013-39, the Future Material Discovery Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT, and Future Planning (MSIP) of Korea under a Grant No. NRF-2016M3D1A1023384, and Brain Korea 21 PLUS Project for Center for Creative Industrial Materials. Authors are grateful to Mr. Hyeungjun Kim of Key Yang Precision for his helpful discussion on the fabrication of austenitic cast steels.
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Jung, S., Jo, Y.H., Jeon, C. et al. Replacement of Ni by Mn in High-Ni-Containing Austenitic Cast Steels used for Turbo-Charger Application. Metall Mater Trans A 48, 568–574 (2017). https://doi.org/10.1007/s11661-016-3878-8
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DOI: https://doi.org/10.1007/s11661-016-3878-8