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Incremental permeability as a function of the amplitude of centered minor loops for power plant steels P9 and T22 in the as-normalised (N), service-entry (T) and ex-service (ES) conditions

 

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COMSOL Multi-physics model for a laboratory H-sensor and modelled and measured inductance vs frequency results and predicted permeability.

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Figures showing the magnetic flux penetrating through a dual phase (ferrite + second phase) microstructure. Pearlite is a ferromagnetic phase at room temperature, and in this structure the magnetic flux can more readily pass through pearlitic regions, whereas the austenite phase (paramagnetic) is less favourable hence a more complex route occurs between ferrite regions, with a correspondingly lower relative permeability value.

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Schematic mechanism of micro-cracking of Zn coated HPF Boron Steel

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Plan view of sample arrangement in a Gleeble 3500 machine showing samples of 10 mm diameter that are melted in a quartz tube using resistance heating through tungsten electrodes. Cooling is achieved through the electrodes, which are in contact with water-cooled copper grips. A cooling rate of 100 °C/s has been achieved using this approach.

6

phase-field_modelling_of_a_b2_intermetallic_precipitates_in_a_low_density_steel.jpg

Phase-field modelling of a B2 intermetallic precipitates in a low density steel