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98313 Thermal Stability and Microstructural Changes of Some Ni-Cr-Mo Alloys as Detected by Corrosion Testing

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Product Number: 51300-98313-SG
ISBN: 98313 1998 CP
Author: M.Kohler, D.C.Agarwal
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Wrought Ni-Cr-Mo alloys of the C-family show a sensitivity to intercrystalline attack especially after exposure in the temperature range of 650°C to 950° C. Nevertheless microstructural changes due to precipitation of intermetallic phases can occur up to a temperature level of 1050”C and this can affect the localized corrosion resistance. Thermal stability of wrought Alloy C-276 is a lot lower in comparison to Alloy 59, Sensitized at 870°C for only 1 hour, Alloy C-276 fails in the ASTM-G28B test due to rapid intercrystalline penetration and pitting where as Alloy 59 can be aged up to 3 hours without any increase of the corrosion rate or any pitting attack. The same ranking applies during polythermal cooling cycles. Alloy C-276 requires a cooling rate of 150°C/min, between the solution an nealing temperature and 600”C to avoid any sensitization whereas for Alloy 59, has a relative slow cooling rate of 25°C/min, is acceptable, The critical pitting temperature of Alloy 59 when tested in the Green Death solution, had been determined to be > 125°C. The temperature was not lowered during aging up to 3 hours at 1050°C, or if a cooling speed of 25°C/min, was applied. However, cooling rates of 50°C/min, or less reduced the critical pitting temperature of Alloy C-276 from 115°C in the solution annealed and water quenched condition only 105°C, Keywords: Ni-Cr-Mo alloys, intergranular corrosion, pitting, sensitization, ASTM-G28 A and B, Green Death, thermal stability, Alloy 59- UNSN06059, AlloyC-276- UNSN10276.
Wrought Ni-Cr-Mo alloys of the C-family show a sensitivity to intercrystalline attack especially after exposure in the temperature range of 650°C to 950° C. Nevertheless microstructural changes due to precipitation of intermetallic phases can occur up to a temperature level of 1050”C and this can affect the localized corrosion resistance. Thermal stability of wrought Alloy C-276 is a lot lower in comparison to Alloy 59, Sensitized at 870°C for only 1 hour, Alloy C-276 fails in the ASTM-G28B test due to rapid intercrystalline penetration and pitting where as Alloy 59 can be aged up to 3 hours without any increase of the corrosion rate or any pitting attack. The same ranking applies during polythermal cooling cycles. Alloy C-276 requires a cooling rate of 150°C/min, between the solution an nealing temperature and 600”C to avoid any sensitization whereas for Alloy 59, has a relative slow cooling rate of 25°C/min, is acceptable, The critical pitting temperature of Alloy 59 when tested in the Green Death solution, had been determined to be > 125°C. The temperature was not lowered during aging up to 3 hours at 1050°C, or if a cooling speed of 25°C/min, was applied. However, cooling rates of 50°C/min, or less reduced the critical pitting temperature of Alloy C-276 from 115°C in the solution annealed and water quenched condition only 105°C, Keywords: Ni-Cr-Mo alloys, intergranular corrosion, pitting, sensitization, ASTM-G28 A and B, Green Death, thermal stability, Alloy 59- UNSN06059, AlloyC-276- UNSN10276.
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