Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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High-temperature Oxidation of Turbocharger Steels Manufactured by Powder Metallurgy and Casting

분말야금법과 주조법으로 제조한 자동차 터보차져강의 고온산화

  • Park, Soon Yong (School of Advanced Materials Science & Engineering, Sungkyunkwan University) ;
  • Lee, Dong Bok (School of Advanced Materials Science & Engineering, Sungkyunkwan University)
  • 박순용 (성균관대학교 신소재공학부) ;
  • 이동복 (성균관대학교 신소재공학부)
  • Received : 2015.01.20
  • Accepted : 2015.06.26
  • Published : 2015.06.30
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Abstract

Turbocharger steels were manufactured by the powder metallurgical and casting method. They consisted primarily of a large amount of ${\gamma}$-Fe, a small amount of ${\alpha}$-Fe, and fine $Nb_6C_5$ precipitates. The casting method was better than the powder metallurgical method, because a sound matrix with little oxides were obtained. When turbocharger steels were oxidized at $900^{\circ}C$ for 50 h, $Mn_2VO_4$ and (Mn,Si)-oxides were formed along grain boundaries, while $Mn_2O_3$ and $CrMn_2O_4$ were formed intragranularly. Fe, Nb, and Ni were depleted in the oxide scale.

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References

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