Authors: Santosh Kumar Atul R Patil Suresh Arangi
Publish Date: 2016/01/04
Volume: 69, Issue: 2, Pages: 425-429
Abstract
High cycle fatigue fracture behavior of three different steel grades used extensively in automotive industry ie 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 184 in longitudinal direction and 32 and 333 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 strengthThe authors gratefully acknowledge the extended support provided to this work by KCTI Kalyani Centre for Technology and Innovation for providing financial funding laboratory and library facilities The authors also acknowledge the support provided by Bharat Forge Ltd Pune and DSIR Department of Scientific and Industrial Research Govt of India Finally the authors would like to express special thanks and gratitude to review committee and top management of Bharat Forge Ltd for granting the permission to publish/present the research work Special thanks to Mr Shreyas Kirwai Manager KCTI for encouragement and support in writing the paper
Keywords: