Cr-Mo-V鋼の遷移クリ-プ (耐食・耐熱材料<特集>)

概要

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The relationship between the creep rate and the microstructure was studied in the transient creep stage of a Cr-Mo-V steel and a mechanism of the transient creep was discussed. The transient stage in as tempered Cr-Mo-V steel extended to about a quarter of the rupture life. The creep rate decreased to more than two orders of magnitude in this transient stage. The amount of decreases in hardness and the half value width of an X-ray diffraction peak in the transient stage was larger than that in the accelerating stage. The substantial decrease in the hardness and the half-value width during the transient stage was mainly due to the decrease in the dislocation density. The creep rate and the total creep strain during the transient stage for pre-aged specimen were lower than those for the as-tempered specimen. An estimation of the excess dislocation density corresponding to the total creep strain during the transient stage was carried out. The annihilation of pre-existing dislocations was proposed as a predominant mechanism for an occurrence of the transient creep in Cr-Mo-V steel.
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