HASTELLOY C-22HS Alloy

Alloy name: HASTELLOY C-22HS
Diagram No.: 1104
Type of diagram: TTT
Chemical composition in weight %: max. 0.01% C, max. 0.08% Si, 21% Cr, 17% Mo, max. 1% W, max. 2% Fe, 0.006% B, balance is Ni
Alloy group: Nickel-based alloys
Note: Time-Temperature-Transformation diagram of grain boundary precipitates in C-22HS.
To understand the grain boundary phase precipitation in C-22HS alloy, isothermal exposures have been also conducted in a wide temperature range (600-1050 C) with different times as shown in Table III. A super-solvus temperature of 1120 C was conducted for full dissolution of Mu and M6C phase at mill annealed condition. A T-T-T curve of grain-boundary precipitation was determined by SEM observation as shown in Figure.
Grain boundary precipitation is accelerated by increasing temperature as shown in Figure 12 from 600 C to 750 C. Above 800 C, the grain-boundary precipitation develops very fast and a certain amount of grain-boundary precipitates can be formed at very short time such as only after 10min in the temperature range from 800 C to 1050 C. An EDX spectrum of grain-boundary precipitates in this temperature range (for example 900 C/96h) shows very high molybdenum content. It reminds us that the grain boundary precipitates in the temperature range of 600 C-1050 C might be high molybdenum containing phase and M6C carbide. The detail work on grainboundary precipitation will be studied further.
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