Cyclic deformation behaviour of quenched and tempered AISI 4140 at two-step tensile-compressive-loading

The cyclic deformation behaviour in stress-controlled two-step experiments with one or more changes between two blocks of certain lengths and amplitudes was investigated at the technically important steel AISI 4140 (German grade 42 CrMo 4). In all two-step experiments cyclic worksoftening behaviour is found. The degree of worksoftening is discussed in comparison to single-step experiments. In several cases effects of static strain-ageing can be found.