A systematic study of the effects of Ti, Ta and Nb on the hot corrosion behavior of alloy system Ni-16Cr-gAl-2W-1Mo-4Co-(0～4)Ti-(0～4)Ta-(0～4)Nb (at%) was conducted. The results showed that, in certain compositional...A systematic study of the effects of Ti, Ta and Nb on the hot corrosion behavior of alloy system Ni-16Cr-gAl-2W-1Mo-4Co-(0～4)Ti-(0～4)Ta-(0～4)Nb (at%) was conducted. The results showed that, in certain compositional regions, the hot corrosion resistance in 75% NaiSO4+25%NaCl molten salt of the expermental alloys was similar to that of IN738LC alloy. The hot corrosion property balances with other properties, which provides the basis for selecting alloy compositions to develop single crystal superalloys of high performance hot corrosion resistance.展开更多
Based on the experimental results in the previous paper, the mechanism of the hot corrosion behavior of alloy system Ni-16Cr-gAl-2W- 1Mo-4Co-(0～4)Ti-f(0 ～ 4)Ta-(0～4)Nb (in at%) is investigated. In the Ti and Nb-ric...Based on the experimental results in the previous paper, the mechanism of the hot corrosion behavior of alloy system Ni-16Cr-gAl-2W- 1Mo-4Co-(0～4)Ti-f(0 ～ 4)Ta-(0～4)Nb (in at%) is investigated. In the Ti and Nb-rich corners, 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' seemed to give a correct prediction of the hot corrosion resistance of such alloy systems.展开更多
文摘A systematic study of the effects of Ti, Ta and Nb on the hot corrosion behavior of alloy system Ni-16Cr-gAl-2W-1Mo-4Co-(0～4)Ti-(0～4)Ta-(0～4)Nb (at%) was conducted. The results showed that, in certain compositional regions, the hot corrosion resistance in 75% NaiSO4+25%NaCl molten salt of the expermental alloys was similar to that of IN738LC alloy. The hot corrosion property balances with other properties, which provides the basis for selecting alloy compositions to develop single crystal superalloys of high performance hot corrosion resistance.
文摘Based on the experimental results in the previous paper, the mechanism of the hot corrosion behavior of alloy system Ni-16Cr-gAl-2W- 1Mo-4Co-(0～4)Ti-f(0 ～ 4)Ta-(0～4)Nb (in at%) is investigated. In the Ti and Nb-rich corners, 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' seemed to give a correct prediction of the hot corrosion resistance of such alloy systems.
