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Effect of change of carbide particle distribution on accelerated creep rate of the steel X20 = Vpliv spremembe porazdelitve karbidnih izločkov na hitrost pospešenega lezenja jekla X20
Vodopivec, Franc, 1931-2021 ; Vojvodič-Tuma, Jelena ; Kmetič, Dimitrij
It was shown that by annealing the steel X20 at 800 [compositum]C for up to 1440 h the accelerated creep rate was increased by aproximately 4.5 times above a critical value of the calculated average ...carbide interparticle distance. In this work the effect of two microstructural parameters; number of carbide stringers at martensite grains and subgrains per unity of surface and of interparticle distance in stringers on accelerated creep rate was determined for the same steel and heat treatment. The number of stringers and the interparticle distance in stringes were manually assessed on micrographies. The interparticle distance in carbide stringers increased proportionally and the number of stringers per unity of surface decreased proportionally to the cubic root of the annealing time. By the longest annealing time, the interparticle distance in stringers increased for 1.46 times, the calculated interparticle increased for 6.2 times, the number of stringers decreased for aproximately 38 times and the accelerated creep rate increased for nearly 2 orders of magnitude. It was found, also, that the accelerated creep rate increased exponentially with the decrease of the density of carbide stringers and proportionally to the interparticle distance in stringers. These experimental findings indicate, that the effect of the change of the number of carbide stringers on accelerated creep rate is stronger than the effect of the calculated interparticle distance and that the acceleration of secondary creep rate is stronger than the effect of the calculated interparticle distance and that the acceleration of secondary creep rate is due mainly to the decomposition of carbide stringers. It is concluded that models that do not account for the distribution of carbide particles, are not a reliable base for equations for the calculation of the creep activation energy.
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