Abstract
Tensile and creep properties of new austenitic steel Sanicro 25 at room temperature and operating temperature 700 °C were investigated by testing on miniature specimens. The results were correlated with testing on conventional specimens. Very good agreement of results was obtained, namely in yield and ultimate strength, as well as short-term creep properties. Although the creep rupture time was found to be systematically shorter and creep ductility lower in the miniature test, the minimum creep rates were comparable. The analysis of the fracture surfaces revealed similar ductile fracture morphology for both specimen geometries. One exception was found in a small area near the miniature specimen edge that was cut by electro discharge machining, where an influence of the steel fracture behavior at elevated temperature was identified.
Highlights
IntroductionMechanical testing on miniature specimens is becoming increasingly important for several reasons
Mechanical testing on miniature specimens is becoming increasingly important for several reasons.It can be used for testing irradiated materials to minimize the radiation dose, determining the local properties of weld zones or the remaining life of service exposed parts, the development of new materials available in limited amounts, etc
Different specimen geometries have been introduced in the past for tensile, fracture, and creep properties determination [1,2,3,4,5,6], including the well-known small punch test (SPT) and small punch creep test (SPC) [7,8,9,10,11,12,13,14,15,16,17,18,19,20]
Summary
Mechanical testing on miniature specimens is becoming increasingly important for several reasons It can be used for testing irradiated materials to minimize the radiation dose, determining the local properties of weld zones or the remaining life of service exposed parts, the development of new materials available in limited amounts, etc. The application of creep tests to miniature specimens is primarily intended for accelerated testing—mainly remaining life or local properties determination. It would hardly replace conventional long-term creep tests, and a reasonable length of such an experiment is within the 1000 h range
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