Abstract
The multiple step test has been applied to measuring cyclic stress-strain curves in nickel as a function of temperature. One specimen with hour-glass geometry was used. By comparison with results on companion specimens tested isothermally at the same temperatures as used for the step test it is shown that the multiple step test is a poor method of measuring cyclic stress-strain curves in these circumstances. One reason for this is interference from apparent hardening which is an artefact of crack propagation and the diametral method of measuring strain. In addition microtwins were observed to form along the dislocation cell boundaries during temperature step changes. Normally such twins are not observed in continuous cycling.
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