Hideo Abe1, Takeshi Suzuki1 and Kentaro Tobimatsu2
1Department of Metallurgy and Materials Science, Faculty of Engineering, The University of Tokyo, Tokyo
For a low-carbon aluminium-killed steel quenched from the solution temperature (973 K) and preliminarily aged at 308 K for 73200 s or 106 s, the reversion and subsequent age-hardening at 348 K, 373 K, 423 K and 448 K are traced by displacement of the data-points on the thermoelectric power vs. electrical conductivity plots. The reversion is represented by reverse displacement of the data-point to the as-quenched state. This indicates that the coherency strain generated by the preageing at 308 K is maintained during the reversion. It is further speculated that the coherency strain induced by the succeeding precipitation of epsilon carbide is nearly the same in magnitude as that in the case of direct ageing at the same temperature. During the growth of epsilon carbide particles, the coherency strain declines gradually.
ageing, reversion, precipitation of carbides, low-carbon aluminium-killed steel, thermoelectric power, electrical conductivity, coherency strain
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