Abstract
High cycle fatigue fracture behavior of three different steel grades used extensively in automotive industry i.e. Microalloyed (MA), Quench and Tempered (QT) and Bainitic steel (BS) were studied using Rotating Bending Fatigue test and were compared. The results indicated that the fatigue strength of BS is higher than that of QT and MA steel in both longitudinal and transverse direction. The Endurance strength obtained for BS is higher than that of QT and MA by 12 and 18.4 % in longitudinal direction and 3.2 and 33.3 % in transverse direction. But, fatigue ratio of MA steel in longitudinal direction is higher as compared to that of BS and QT steel and in transverse direction the same is lower than BS and similar to QT steel. Microstructural analysis revealed the presence of full Bainitic structure in case of BS as against the pearlite–ferrite plus Bainitic structure for QT steel and pearlite with grain boundary ferrite for MA steel. The presence of full Bainitic microstructure in BS may be the reason of its higher fatigue strength.
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