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Calculation of accelerated stationary creep rate activation energy for a steel microstructure with a uniform distribution of carbide particles = Izračun aktivacijske energije za stacionarno hitrost lezenja za jeklo z mikrostrukturo z enakomerno porazdelitvijo karbidnih izločkov
Žužek, Borut ...
Recent research has shown a dependence of the accelerated creep rate on the carbide particle distribution in martensite, with the creep rate depending on the number of carbide particles per unit of ...surface and their mutual distance. The aim of our work was to calculate the activation energy for different carbide particle sizes and particle spacings, using a modified equation for the creep rate calculation. For creep-resistant steel with a microstructure of ferrite matrix and a uniform distribution of M23C6 carbide particles the creep rate was calculated in the temperature range 540 °C to 630°C and a carbide particle size between 0.1 [mu]m and 0.4 [mu]m. An equal effect on the creep rate increase was found for all four carbide particle sizes. From the calculated creep rates a creep activation energy of 248.7 kJ/mol was calculated, independent of the particles size. The calculated creep activationenergy was found to be close to the self-diffusion activation energy in [alpha]-iron.
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