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Analysis of Failure of a Chassis Long Member Manufactured from E-46 Grade Hot-Rolled Steel Coil

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Abstract

In the present study, failure investigation was performed to find the root cause of the defects that occurred during bending operation for fabrication of a long chassis member. The component was manufactured from E-46 grade hot-rolled coil with ferrite–pearlite microstructure. Several longitudinal cracks were formed on one side of the outer bends of the long member. Detailed microstructural examination revealed occurrence of long unidirectional unbranched cracks with deposits and intermittent stringers of nonmetallic entrapments in the rolling direction. EDS analyses showed majority of these deposits and entrapments were FeO-rich manganese silicate associated with silicomanganese and ferromanganese alloy added to the molten steel for chemistry adjustment. Bending operation of the coil perpendicular to the rolling direction of steel sheet and orientation of the entrapments as well to cold form the chassis long member resulted in high degree of stress concentration around the entrapments. Finally, localized tearing of the outer surface layer of the bend at multiple locations occurred.

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Acknowledgments

The author is thankful to the Management of R & D Centre for Iron & Steel (RDCIS), Steel Authority of India Limited (SAIL), Ranchi, India, for their support and encouragement in pursuing this work. Thanks are due to Mr. John Guria for his assistance in optical and scanning electron microscopy. Efforts provided by Mr. Ram Oraon for metallographic sample preparation job are thankfully acknowledged. The author expresses his sincere gratitude to Dr. S.K. Dhua for rendering valuable technical expertise during the course of this work.

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  1. R & D Centre for Iron and Steel, Steel Authority of India Limited, Ranchi, Jharkhand, 834 002, India

    P. P. Sarkar

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Sarkar, P.P. Analysis of Failure of a Chassis Long Member Manufactured from E-46 Grade Hot-Rolled Steel Coil. J Fail. Anal. and Preven. 20, 819–832 (2020). https://doi.org/10.1007/s11668-020-00881-2

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