CUI Hua, ZHANG Ji-shan, MURATA Y, MORINAGA M, and YUKAWA N, HOT CORROSION BEHAVIOR OF Ni-BASED SUPERALLOY WITH HIGH Cr CONTENTS—PART Ⅱ. MECHANISM OF HOT CORROSION BEHAVIOR, J. Univ. Sci. Technol. Beijing, 3(1996), No. 2, pp. 91-98.
Cite this article as:
CUI Hua, ZHANG Ji-shan, MURATA Y, MORINAGA M, and YUKAWA N, HOT CORROSION BEHAVIOR OF Ni-BASED SUPERALLOY WITH HIGH Cr CONTENTS—PART Ⅱ. MECHANISM OF HOT CORROSION BEHAVIOR, J. Univ. Sci. Technol. Beijing, 3(1996), No. 2, pp. 91-98.
CUI Hua, ZHANG Ji-shan, MURATA Y, MORINAGA M, and YUKAWA N, HOT CORROSION BEHAVIOR OF Ni-BASED SUPERALLOY WITH HIGH Cr CONTENTS—PART Ⅱ. MECHANISM OF HOT CORROSION BEHAVIOR, J. Univ. Sci. Technol. Beijing, 3(1996), No. 2, pp. 91-98.
Citation:
CUI Hua, ZHANG Ji-shan, MURATA Y, MORINAGA M, and YUKAWA N, HOT CORROSION BEHAVIOR OF Ni-BASED SUPERALLOY WITH HIGH Cr CONTENTS—PART Ⅱ. MECHANISM OF HOT CORROSION BEHAVIOR, J. Univ. Sci. Technol. Beijing, 3(1996), No. 2, pp. 91-98.
Based on the experimental results in the previous paper, the mechanism of the hot corrosion behavior of alloy system Ni-16Cr-9Al-2W-lMo-4Co-(0~4)Ti-(0~4)Ta-(0~4)Nb (in at%) is investigated. In the Ti and Nb-rich comers, hot corrosion is controlled by the basic fluxing mechanism, and a dense and protective surface scale is formed which results in the better hot corrosion resistance for the alloys in these regions. While in the Ta-rich comer, the basic and acidic mechanisms function alternatively, which results in the catastrophic corrosion by forming the porous and non-protective scale, so the alloys in this region show poor hot corrosion resistance. In addition, the concept of "effective chromium content" seeraed to give a correct prediction of the hot corrosion resistance of such alloy systems.
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