“…Different precipitation phases have also been identified, including ␥-Ni 3 Mo, [1,3,[6][7][8] -Ni 3 Ti, [1][2][3][4]6,[8][9][10][11] Laves-Fe 2 Mo, [1][2][3]6,9] -FeMo, [1] -Fe 7 Mo 6 , [1,4] FeTi, [1,7] Fe 2 Ti, [1] , [11,12,13] and dispersion austenite, [10] either singly or simultaneously occurring. Moving on to precipitation strengthening mechanisms, there are a dislocation looping mechanism [2,14] and a shearing mechanism. [3,15] Many authors observed reverted austenite of different morphology under overaging or special treatment, its orientation relationship with martensite varying in the range of Nishiyama-Wassermann (N-W) [3,16,17] and Kudjumov-Sachs (K-S) [3,6,17,18] types.…”