室温および高温下における2.25Cr-1Mo鋼の超高サイクル疲労寿命特性(<特集>高温強度)

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An ultrasonic fatigue testing machine was developed to obtain the very high cycle fatigue life at elevated temperature forsafety and reliability of structural components in the faster breeder reactor (FBR). This testing machine consists of anamplifier, booster, horn and equipments such as a system controller and data acquisition. The test specimen is attached atthe end of the horn. The electric power generated in the amplifier is transformed into the mechanical vibration in theconverter and is magnified in the booster and horn. The developed ultrasonic fatigue testing machine enables to carry outthe fatigue test at 20kHz so that it can perform the very high cycle fatigue test within a very shorter time as compared with theregular fatigue testing machines such as a hydraulic fatigue testing machine. This study carried out very high cycle fatiguetests using type STBA 24, the steel for tube in boiler and heat exchanger, at room and elevated (673K) temperatures by thedeveloped testing and conventional hydraulic testing machines, and obtained the fatigue lives. This paper also described thecracks observed on specimen surface of fatigued specimen and discussed the very high cycle fatigue strength properties. Itwas confirmed that the fatigue data obtained by the ultrasonic fatigue testing machine are continuous and compatible with theresults obtained by the hydraulic tension-compression testing machine. Fatigue lives more than 106 cycles at room and hightemperatures can be predicted conservatively by the best fit design curve employed in the nuclear power plant design.
社団法人日本材料学会の論文
2005-02-15

室温および高温下における2.25Cr-1Mo鋼の超高サイクル疲労寿命特性(<特集>高温強度)

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