21/4Cr・1Mo 鋼再現溶接熱影響部のクリープ破断強度

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In the creep rupture test, it has been reported that the probability of heat affected zone fracture increases with increasing rupture time. The authors aimed to study the behavior of weld heat affected zone of 21/4Cr-1Mo steel during creep rupture test. We used simulated heat affected zone specimens, one series of which was in accord with the coarse grained region (peak temperature 1350℃) and the other with the fine grained region (peak temperature 1000℃) of weld heat affected zone. The simulated specimens were post heat treated at various temperatures (690℃∿760℃) and then exposed at 550℃ for 5000hours. The above specimens were rupture tested at 550℃. The results are summarized as follows. 1. The coarse grained specimens showed intergranular fracture independently of the application of post heat treatment as well as of long-time exposure treatment. On the other hand, most of fine grained specimens showed transgranular fracture. 2. The rupture strength was improved by post heat treatment. The optimum post heat treatment temperature was found to be about 725℃. In accordance with the deviation from the above optimum condition, rupture strength decreased. 3. The long-time exposure treatment at 550℃ improved the rupture strength of coarse grained specimens. But for the fine grained specimens, it usually deteriorated the rupture strength. 4. The effects of post heat treatment and long-time exposure treatment were discussed on the basis of the effect of carbide precipitation on the formation of denuded zone around grain boundary and on matrix strengthening.
社団法人溶接学会の論文
1969-02-25

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