Journal article

Replacement of Ni by Mn in High-Ni-Containing Austenitic Cast Steels used for Turbo-Charger Application

Jung S, Jo Y, Jeon C, Choi W, Lee B, Oh Y, Kim G, Jang S, Lee S ...see all

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, vol. 48, issue 2 (2017) pp. 568-574 Published by Springer Boston

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Abstract

Since turbo-chargers require more excellent high-temperature properties to maintain their structures at further higher exhaust gas temperatures up to 1050 ??C, a 20 wt%-Ni-containing austenitic cast steel (N20 steel) has been suggested as a promising candidate cast steel. However, this steel is very expensive because it contains a large amount of expensive Ni. In order to partly replace expensive Ni by inexpensive Mn and to improve high-temperature tensile properties in the N20 steel, three austenitic cast steels were fabricated by replacing 6 wt% of Ni by 6.9 wt% of Mn or by adding 2???4 wt% of Mo. Thermodynamically calculated fractions of equilibrium phases (austenite, ferrite, and M7C3 carbide) were matched with experimentally measured fractions, although they were somewhat overestimated. The N14 steel where 6 wt% Ni was replaced by 6.9 wt% of Mn did not contain any ferrite, and showed comparable or more excellent high-temperature tensile properties than those of the N20 steel, which indicated the successful replacement up to 6 wt% Ni by Mn, together with alloying cost reduction of 10%. The Mo addition also favorably affected high-temperature properties because Mo worked for increasing both M7C3 fraction and austenite matrix hardness. Simultaneously considering mechanical properties and alloying costs, therefore, these Mo-containing N14 steels can be fully adopted for high-performance turbo-chargers requiring excellent high-temperature properties.

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Authors

  • Byeong-Joo LeePohang University of Science and Technology

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  • Seungmun Jung

  • Yong Hee Jo

  • Changwoo Jeon

  • Won Mi Choi

  • Yong Jun Oh

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