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Failure Analysis of High-Strength Friction-Grip (HSFG) Bolt Used in the Thermal Power Plant

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Abstract

This work discusses the failure analysis of high-strength friction-grip (HSFG) bolt used at the connection between the roof girder plate and column plate at the main powerhouse of 660 MW thermal power plant. During the commissioning work, a few number of bolts have failed on tightening with power torque wrench. The fracture has been observed to have occurred at the thread portion and propagating at an angle of 45° to the axis of the bolt. The visual examination, chemical composition, fractography, hardness, and micrograph analysis using optical microscopy, scanning electron microscopy and transmission electron microscopy were conducted for analyzing the cause of failure. A tensile test was done on the new bolt from the same batch to evaluate the tensile properties of bolt. The results reveal that the failure is attributed to the presence of high inclusion content in steel particularly oxide and aluminate inclusions.

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Acknowledgements

The authors like to convey the sincere thanks to the Executive Director, Bharat Heavy Electricals Limited (BHEL), Tiruchirappalli, Tamil Nadu, for providing required approval for publication.

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  1. Welding Research Institute, Bharat Heavy Electricals Limited (BHEL), Tiruchirappalli, India

    Vimalan Gurunathan & Senthil Murugan R

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  1. Vimalan Gurunathan
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  2. Senthil Murugan R
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Correspondence to Vimalan Gurunathan.

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Gurunathan, V., R, S. Failure Analysis of High-Strength Friction-Grip (HSFG) Bolt Used in the Thermal Power Plant. Trans Indian Inst Met 76, 1593–1603 (2023). https://doi.org/10.1007/s12666-023-02871-y

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  • DOI: https://doi.org/10.1007/s12666-023-02871-y

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