Accession Number : AD0460889


Title :   THERMAL FATIGUE BEHAVIOR OF NIMONIC 80A AND PH 15-7 MO STAINLESS STEEL.


Descriptive Note : Summary rept., Jul 60-Dec 62 on Metallic Materials,


Corporate Author : TECHNISCHE HOCHSCHULE MUNICH (GERMANY F R)


Personal Author(s) : Krempl, E ; Neuber, H


Report Date : Jan 1965


Pagination or Media Count : 63


Abstract : The thermal fatigue behavior of Nimonic 80A and PH 15-7 Mo stainless steel was investigated. An automatic testing apparatus used in this work is described. Thermal stresses are generated by direct resistance heating and constraint of the specimen. Stresses and temperature are measured and recorded as hysteresis loops and the respective amounts of strain are calculated. The interpretation of the results for the stainless steel is complicated by the occurrence of a martensite-austenite transformation during thermal cycling, which changes the coefficient of thermal expansion by about 25%. Below the transformation temperature both materials behave similarly during thermal fatigue loading. The results of the investigation indicate that thermal fatigue life is a function of the width of the first hysteresis loop regardless of test conditions. (Author)


Descriptors :   *STAINLESS STEEL , *NICKEL ALLOYS , FATIGUE(MECHANICS) , FATIGUE(MECHANICS) , TEST EQUIPMENT , AUTOMATIC , THERMAL STRESSES , THERMAL EXPANSION , CHROMIUM ALLOYS , STRAIN(MECHANICS) , HYSTERESIS


Distribution Statement : APPROVED FOR PUBLIC RELEASE