Microstructural Aspect of Ageing Process of GP91 Cast Steel

Grzegorz Golański; Joanna Kępa

doi:10.4028/www.scientific.net/SSP.203-204.368

Paper Titles

Computer Investigations of Features of RHEED Oscillations for GaAs and for Ge
p.347

Microstructure Characterization of Superfine WC-Co Powders
p.351

Sigma Phase Precipitations in Duplex Steel SAF 2205
p.355

Microstructure of the Fe-Ni-P Melt-Spun Ribbons Produced from the Single-Chamber and from the Double-Chamber Crucibles
p.361

Microstructural Aspect of Ageing Process of GP91 Cast Steel
p.368

The Microstructure of Quasicrystalline Al-Cu-Fe Alloys Doped with Tungsten
p.372

The Fracture Morphology of Composites with Quasicrystalline Phase
p.376

Structural Studies of the Relaxed Amorphous Phase in the Fe₈₁B₁₄Nb₅ Alloy
p.380

The Study of Local Structure of Amorphous Fe-Co-B-Si-Nb Alloy by Atomic Pair Distribution Function
p.386

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Microstructural Aspect of Ageing Process of GP91 Cast Steel

Abstract:

The microstructure of 9% Cr cast steel for advanced power plants, serviced at around 580 − 600°C, after ageing has been characterized. The investigated cast steel was subject to ageing at the temperature of 600°C for 6000 and 8000 hrs. Quantitative TEM analysis of the cast steel microstructure was performed to describe the dislocation density within subgrains, the width of martensite subgrains and the M₂₃_C6 carbides parameters (shape and mean diameter). Moreover, the phase identification was carried out using electron diffraction. The results have shown that an increase in ageing time at 600°C temperature is the reason for slight increase in the subgrain size, the size of M₂₃C₆ carbides and a decrease in dislocation density within subgrains. The MX particle size was not changed. The Laves phase was identified in the cast steel microstructure after 6000 hrs of ageing.