Slip-rolling resistance and load carrying capacity of 36NiCrMoV1-5-7 steel

The approaching CO2 targets have now forced automotive OEMs to direct R&D efforts in the powertrain to reduce friction and increase lifetime as well as load carrying capacities of running systems. Martensitic steels such as 36NiCrMoV1-5-7 have a great potential to be used in automotive powertrain applications owing to their favorable mechanical properties. In order to realize lightweighting strategies it is essential that steels with improved fracture toughness values, as well as higher annealing temperatures with regard to higher contact pressures and possible thin film coating application, should be considered. State-of-the-art steels, like 16MnCr5, 21NiCrMo2, 30CrMoV9 and 100Cr6, are not able to sustain a further increase in torque or load during use, as well as annealing effects under higher oil or deposition temperatures. Therefore, recent research has explored the slip-rolling resistance, frictional and wear behavior of steels, such as 36NiCrMoV1-5-7, Cronidur 30 (AMS 5898), 20MnCr5 (SAE 5120) and 100Cr6H (SAE E52100), and this has shown that possible lean alloying concept alternatives with promising performance characteristics are already available. (AU) © 2015 Companhia Brasileira de Metalurgia e Mineração (CBMM)