Avesta 654 SMO Steel

Steel name: Avesta 654 SMO
Diagram No.: 7364
Type of diagram: TTT
Chemical composition in weight %: 0.016% C, 0.26% Si, 3.65% Mn, 0.017% P, <0.001% S, 24.40% Cr, 7.26% Mo, 21.90% Ni, 0.503% N
Steel group: Austenitic stainless steels
Note: Calculated diagram. The calculated composition of equilibrium phases for all steels agree reasonably well with experimentally found ones. However, in the AVESTA 254 SMO and 654 SMO steels no Sigma phase was found after annealing at 700 °C for 500 h; a Laves phase was found instead and the Sigma phase subsequently appears only very slowly. The experimentally determined content of Cr, Mo, and Ni in the Sigma phase is also systematically lower than that calculated for both AVESTA steels. Minor amounts of other phases, mainly the Pi phase, is present in all steels after 6170 h of annealing. The presence of residual Laves phase in the AVESTA alloys after 6170 h at 700 C also indicates that equilibrium has still not been achieved after this period. Thermodynamic calculations show that once a metastable Laves phase has precipitated, there is only a very small driving force to convert it to the equilibrium Signa phase.
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