Replacement of Ni by Mn in High-Ni-Containing Austenitic Cast Steels used for Turbo-Charger Application |
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Authors: | Seungmun Jung Yong Hee Jo Changwoo Jeon Won-Mi Choi Byeong-Joo Lee Yong-Jun Oh Gi-Yong Kim Seongsik Jang Sunghak Lee |
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Affiliation: | 1.Center for Advanced Aerospace Materials,Pohang University of Science and Technology,Pohang,Korea;2.Department of Advanced Materials Engineering,Hanbat National University,Daejeon,Korea;3.Research and Development Center,Key Yang Precision,Gimcheon,Korea |
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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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