報告書番号

E282011

タイトル（和文）

THE CHARACTERISTICS OF THERMAL-MECHANICAL FATIGUE STRENGTH IN SUPERALLOYS FOR GAS TURBINE

タイトル（英文）

THE CHARACTERISTICS OF THERMAL-MECHANICAL FATIGUE STRENGTH IN SUPERALLOYS FOR GAS TURBINE

概要 （図表や脚注は「報告書全文」に掲載しております）

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概要 （英文）

A HIGH-TEMPERATURE GAS-TURBINE IS BEING DEVELOPED FOR A HIGH-EFFICIENCY GAS-STEAM COMBINED-CYCLE POWER PLANT. SUPERALLOYS USED FOR THE GAS-TURBINE ARE REQUIRED TO HAVE EXCELLENT THERMAL FATIGUE STREGHT AS WELL AS GOOD CREEP/CREEP-RUPTURE STRENGTH AND HOT-CORROSION RESISTANCE.IN THIS STUDY,THE THERMAL FATIGUE LIFE CHARACTERISTICS OF SUCH SUPERALLOY WERE EXPERIMENTALLY INVESTIGATED. AS A RESULT,THETHERMAL FATIGUE LIFE WAS FOUND TO DEPEND ON THE STRENGTH AS WELL AS THE DUCTILITY OF THE ALLOY,AND SO,THE BEST RESULT OF THERMAL FATIGUE LIFEPREDICTION WAS GIVEN BY APPLYING THE TOTAL STRAIN RANGE VS.LIFE RELATIONSHIP OBTAINED ISOTHERMALLY AT THE MAXIMUM TEMPERATURE IN THERMAL FATIGUE. IT WAS ALSO FOUND THAT DIRECTIONAL SOLIDIFICATION AND HOT ISOSTATIC PRESSING EXTENDED THE HIGH-TEMPERATURE LOW-CYCLE FATIGUE LIFE OF CASTSUPERALLOYS.

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