51313-02196-Effect of Long-Term Exposure on the Hot Corrosion Performance of High-Temperature Alloys

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Product Number: 51313-02196-SG

ISBN: 02196 2013 CP

Author: Vinay Deodeshmukh

Publication Date: 2013

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Recent work by our group has shown that a relatively short-term (200h) hot corrosion exposure using two-zone furnace rig is quite useful in ranking performance of the high-temperature alloys. However certain alloys can be susceptible to catastrophic hot corrosion after long-term exposure; moreover long-term hot corrosion exposure may assist in discerning performance of the alloys that exhibit good hot corrosion resistance after short-term exposure. This paper is focused on the Type I hot corrosion resistance of high-temperature alloys exposed for 1050h at 900oC. The Ni-base alloys selected for this study are N06230 N06017 N07214 N06002 N12160 while Co-base alloys are R30188 R30155 and Co-Ni-Fe-Nb-Ti-rich alloy. Alloy performances were ranked by assessing weight-change behavior and metal recession measurements which includes metal loss average internal penetration and maximum internal penetration. N06230 and N06017 outperformed rest of the alloys; while among Co-base alloys Co-Cr-Fe-Nb-Ti alloy and R30188 performed reasonably well. N07214 and N06002 underwent catastrophic hot corrosion attack and were removed after 250h exposure. R30155 completed 1050h test but underwent heavy hot corrosion attack. The types of corrosion products formed after 1050h exposure were studied using SEM equipped with EDS. The extent of hot corrosion attack in the alloys was compared with 200h: two-zone hot corrosion data and 1000h: burner-rig hot corrosion data for the selected alloys. The long-term hot corrosion testing simulated via two-zone furnace rig was found to be reliable in comparing alloy performance.