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Vol.43, No.11, 735 ~ 740, 2005
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| Title |
| Special Edition : Symposium on Mechanical Behavior of Materials(1) ; Fatigue Characteristic of the Bucket Material for USC Power Plant |
| 김국철 Kuk Cheol Kim , 석진익 Jin Ik Suk , 김병훈 Byung Hoon Kim , 김정태 Jeong Tae Kim |
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| Abstract |
| Low and high cycle fatigue characteristics were investigated for bucket materials of USC fossil power plant, DS2B2 steel (11Cr1Mo1WCo) and commercial material, COST B2 steel at room and service temperature of 593℃. Both DS2B2 and COST B2 materials were refined by vacuum induction melting(VIM) and electro slag remelting(ESR) process. DS2B2 material was superior to COST B2 for LCF and RCF life. TEM analysis showed that the Wadded DS2B2 steel had finer M23C6 precipitates than COST B2 steel. The LCF characteristics of DS2B2 material manufactured by VIM and ESR processes was improved as compared with that by VIM process. It can be seen that the harmful elements such as sulfur and non-metallic inclusions were reduced and the grain size was finer through the ESR refining process. |
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| Key Words |
| Low cycle fatigue, High cycle fatigue, Bucket, 9-12% Cr steel, Ultrasupercritical power plant |
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