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Development of Evaluation Technique of High Temperature Creep Characteristics by Small Punch-Creep Test Method (I) - Boiler Superheater Tube -
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 Title & Authors
Development of Evaluation Technique of High Temperature Creep Characteristics by Small Punch-Creep Test Method (I) - Boiler Superheater Tube -
Baek, Seung-Se; Na, Seong-Hun; Na, Ui-Gyun; Yu, Hyo-Seon;
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In this study, a small punch creep(SP-Creep) test using miniaturized specimen(10100.5mm) is described to develop the new creep test method for high temperature structural materials. The SP-Creep test is applied to 2.25Cr-lMo(STBA24) steel which is widely used as boiler tube material. The test temperatures applied for the creep deformation of miniaturized specimens are between 550∼600. The SP-Creep curves depend definitely on applied load and creep temperature, and show the three stages of creep behavior like in conventional uniaxial tensile creep curves. The load exponent of miniaturized specimen decreases with increasing test temperature, and its behavior is similar to stress exponent behavior of uniaxial creep test. The creep activation energy obtained from the relationship between SP-Creep rate and test temperature decreases as the applied load increases. A predicting equation or SP-Creep rate for 2.25Cr-lMo steel is suggested. and a good agreement between experimental and calculated data has been found.
2.25Cr-lMo Steel;Small Punch Test;Miniaturized Specimen;SP-Creep Test;Equivalent Fracture Strain( qfo;SP-Creep Rate( qf-ss;Creep Rupture Life;Load Exponent;Activation Energy(Q SPC;Boiler Superheater tube;Initial Strain( qfo;
 Cited by
Sp-Creep 시험에 의한 고온 크리프 특성 평가 기술 개발(ll) - 보일러 헤더 -,백승세;이동환;하정수;유효선;

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SP-Creep 시험에 의한 고온 크리프 특성 평가 기술 개발(I) - 보일러 과열기 튜브 -,백승세;나성훈;나의균;유효선;

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