Atom probe examination of thermally ages CF8M cast stainless steel

Study of phase transformation and mechanical properties evolution of duplex stainless steels after long term thermal ageing (>20 years)

“…An activation energy value of (243 ± 80) kJ/mol is found which is in very good agreement with the activation energy of Cr diffusion in a-iron [20] and with previous work of Danoix and Auger [2], Brown [19,21] or Leax et al [22]. V and k values are reported in Fig.…”

The two-step nucleation of G-phase in ferrite

“…Their early works made in 1980e1990s focused on cast duplex stainless steels, e.g. CF8 and CF8M, applied to the primary coolant water pipe of the light water reactors [9,10]. Recent studies using three-dimensional atom-probe tomography (APT) revealed that NieMneSi clusters, whose solute concentration ratio is equivalent to the stoichiometric composition of the Gphase, are also produced in another types of duplex steels applied to the weld overlay cladding coated on the inner wall of the reactor pressure vessels (RPVs) for protecting them from water/steam corrosion environments [14e17].…”

Phase stability in thermally-aged CASS CF8 under heavy ion irradiation

“…However, the ferrite is susceptible to embrittlement during thermal aging. The mechanisms of thermal aging embrittlement of CASSs have been studied extensively [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. It is suggested that thermal aging embrittlement at 300-500°C are associated with several microstructural processes in the ferrite phase: (1) the formation of Cr-enriched a 0 phase through spinodal decomposition,…”