This study investigates the influence of the substitution of chromium (-0.8 wt.−%) by manganese (+1.3 wt.−%) in a standard quench and tempering steel and the predictability of property changes through simple simulations, only dependent on the chemical composition. The substitution of chromium by manganese leads to an increased hardness (+50 HV10) and a reduction of the critical cooling speed from 19 K s−1 for the reference alloys to 9 K s−1 for the new alloy and a nearly constant hardness of (600 HV10) after Jominy-test. The commercial software JMATPRO is used to simulate and predict key properties for the industrial production. It is shown that a successful simulation of phase transformation temperatures and the general directions of change can be predicted, but more complex properties like critical cooling rates or hardenability need more sophisticated methods.
A new quenching and tempering steel is presented and compared with reference alloys 42CrMo4 and AISI 4140. Through the substitution of chromium (− 0.7 wt.-%) by manganese (+ 1.3 wt.-%) high hardness could be guaranteed by reduced alloying costs. Hardness gradients are shown in the Jominy-test for the reference alloys, while the new alloy shows nearly a constant hardness of 600 HV10. The inductive hardenability was tested using a dilatometer. The new alloy shows a hardness of 780 HV which is 60 HV10 higher than the reference alloys. The critical cooling rate was reduced from 19 K/s for the reference alloys to 9 K/s for the new alloy.
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