Abstract
The thermoelectric power vs. electrical conductivity plot enables us to separate an isothermal ageing process into distinct stages and to evaluate relative magnitude of the lattice strains caused by clustering of solute atoms or the coherency strains induced along precipitate-matrix interfaces. It is suggested that, under the influence of dislocations, the lattice strains caused by clustering of carbon atoms are relaxed, the coherency strains induced around e-carbide particles remain almost unchanged, and those around cementite particles are slightly enhanced. Prestraining before ageing promotes clustering of carbon atoms in place of the precipitation of e-carbide in the early stages of ageing at medium temperatures.
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