Cr-Mo-V 鋳鋼再現熱影響部の諸性質

概要

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The influences of various heat cycles and postheating conditions on the notch ductility of simulated heat-affected zones were studied using a heat cycle simulating equipment concerning the Cr-Mo-V cast steel. The results of these test are summarized as follows. (1) According to SH-CCT diagram of the test steel in the case of a maximum heating temperature being 1,200℃, critical cooling time from the A_<c3> point to 500℃ for the starting point of bainite transformation is 10s. (2) In the case of cooling time from the A_<c3> point to 500℃ being 14s (15% bainite) for the V-notch Charpy impact value and 31s (70% bainite) for the U-notch impact value, the highest impact values were obtained. However, when the cooling time exceeded those values the impact value decreases with the increasing the cooling time, and the cooling time was taken to be 114s (100% bainite) then impact values remarkably decrease for both V-notch and U-notch specimens. (3) When postheated at 700∿750℃, the impact value increases for each cooling curve of heat cycle. However, the influence of cooling time of heat cycle which have direct effects upon the extent of bainite transformation on the impact value does not disappear.
社団法人溶接学会の論文
1980-02-05