Cyclic deformation behavior of austenitic steels in the temperature range -60°C <= T <= 550°C

摘要

In this investigation specimens of the austenitic steels AlSI 304, AlSI 321 and AlSI 348 were investigated in fatigue tests in the temperature range -60°C <= T <= 550°C. A detailed microstructure-based characterization of the cyclic deformation behavior of austenitic steels was performed by means of stress-strain hysteresis, electrical resistance and magnetic measurements. Up to ambient temperature the occurring deformation induced martensite formation was measured in-situ with a ferritescope during cyclic loading. The temperature range for dynamic strain aging was reliably identified by means of a temperature increase fatigue test with one single specimen.