ボイラチューブの経年変化とクリープ損傷評価

概要

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This paper describes the change in mechanical properties of steels after long-term service in power boilers and the evaluation of creep damage for boiler tubing. Interrupted creep tests were carried out for SUS 321HTB, STBA 26, STBA 24 tubes after the service exposure and followed by metallographic studies. The following conclusions were obtained. (1) The change in mechanical properties after the service exposure is related with the change in inherent structure of the steels. In the case of boiler tubing, these changes became very slight at the longer period. (2) For SUS 321HTB, creep voids were observed on the grain boundaries at the end of steady state creep. The density change of the crept specimens had a good relation to the creep strain. (3) It was confirmed that the ferritic steels such as STBA 24 and STBA 26 are very ductile and hard to form voids and cracks even at the accelerated creep. (4) Based on these results, a life evaluation system for boiler tubing was proposed.
社団法人日本材料学会の論文
1988-03-15