Hastelloy X Alloy

Alloy name: Hastelloy X
Diagram No.: 1199
Type of diagram: TTT
Chemical composition in weight %: See the table
Alloy group: Nickel-based alloys
Note: TTT diagram of Hastelloy X produced based on experimental results and literature observations. The TCP phase formation can be seen at longer time intervals [32].
In addition, brittle phases called topologically close-packed (TCP) phases can form during heat treatment and the likelihood of their formation increases as the solute segregation increases. These phases are usually platelike or needlelike phases, known as Sigma, Mu, or Laves phase, and can have negative effects on the mechanical properties (Figure). TCP is intrinsically brittle and it can deplete the matrix from the valuable elements necessary for other properties. Sigma is the most undesirable TCP phase and has a structure similar to the M23C6 carbides. Research has documented Hastelloy X forming TCP phases above 800C, but this often also requires a long heat treatment time.
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