Deformation behavior of 42CrMo4 over a wide range of temperatures and strain rates in Split-Hopkinson pressure bar tests

摘要

In this research, Split-Hopkinson pressure bar tests were performed on samples made from the quenched and tempered steel 42CrMo4 in four different heat-treatment conditions. These samples were subjected to four different pressures and five different temperatures while deforming the samples at strain rates in the range of 10~3 s~(-1). Stress-strain curves and the strain rate were computed from the measured signals. The polished cross-sections of the samples were analyzed before and after testing by means of SEM, EBSD, nanoindentation, and microhardness testing. A variety of deformation characteristics were identified and correlated with the pre-test and post-test microstructure. This work focusses on the influence of the microstructure on deformation and provides a detailed understanding on the deformation of the 42CrMo4 steel over a wide range of parameter values.