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01166 Burner Rig Hot Corrosion of Five Ni-Base Alloys Including Mar-M247

Picture for 01166 Burner Rig Hot Corrosion of Five Ni-Base
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Product Number: 51300-01166-SG
ISBN: 01166 2001 CP
Author: J.A. Nesbitt, K. Harris, R. Helmink and G. Erickson
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The hot corrosion resistance of four new Ni-base superalloys was compared to that of Mar- M247 by testing in a Mach 0.3 burner rig at 900°C for 300 1-hr cycles. While the A1 content was held the same as in the Mar-M247, the Cr and Co levels in the four new alloys were decreased while other strengthening elements (Re, Ta) were increased. Surprisingly, despite their lower Cr and Co contents, the hot corrosion behavior of all four new alloys was superior to that of the Mar-M247 alloy. The Mar-M247 alloy began to lose weight almost immediately whereas the other four alloys appeared to undergo an incubation period of 50-150 1-hr cycles. Examination of the cross-sectional microstructures showed regions of rampant corrosion attack (propagation stage) in all five alloys after 300 1-hr cycles. This rampant corrosion morphology was similar for each of the alloys with Ni and Cr sulfides located in an inner subscale region. The morphology of the attack suggests a classic "Type I", or high temperature, hot corrosion attack.
The hot corrosion resistance of four new Ni-base superalloys was compared to that of Mar- M247 by testing in a Mach 0.3 burner rig at 900°C for 300 1-hr cycles. While the A1 content was held the same as in the Mar-M247, the Cr and Co levels in the four new alloys were decreased while other strengthening elements (Re, Ta) were increased. Surprisingly, despite their lower Cr and Co contents, the hot corrosion behavior of all four new alloys was superior to that of the Mar-M247 alloy. The Mar-M247 alloy began to lose weight almost immediately whereas the other four alloys appeared to undergo an incubation period of 50-150 1-hr cycles. Examination of the cross-sectional microstructures showed regions of rampant corrosion attack (propagation stage) in all five alloys after 300 1-hr cycles. This rampant corrosion morphology was similar for each of the alloys with Ni and Cr sulfides located in an inner subscale region. The morphology of the attack suggests a classic "Type I", or high temperature, hot corrosion attack.
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