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Fracture Failure Analysis on 20MnTiB Steel High-Strength Bolt Used in Bridges

  • Lan Liu
  • Juan WenEmail author
  • Qingcai Liu
  • Lin Chen
Conference paper
  • 483 Downloads
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

The fracture failure of 20MnTiB steel high-strength bolts in some bridges occurred. To reveal the reason for the fracture failure of the high-strength bolts, macroscopic analysis, chemical analysis, phase analysis, microscopic analysis, and metallographic analysis were carried out on one of the failed high-strength bolts. The results show that the corrosion products on the fracture surface of the failed high-strength bolt are mainly composed of SiO2, Fe2O3, and Al2O3 and contain the elements S and Cl by energy spectrum analysis. The fracture analysis of the failed high-strength bolt shows that it had two crack sources, one was outward expansion caused by the notch, and the final fracture turned out tongue pattern, while the other was outward expansion in the form of branches, and the final fracture turned out intergranular fracture morphology. It can be deduced that the main cause of the high-strength bolt fracture is machining defects and stress corrosion.

Keywords

20MnTiB High-strength bolt Fracture failure 

Notes

Acknowledgements

The authors are grateful for the support from Chongqing Key Laboratory of Energy and Environment Engineering and Chongqing Cheng Tou Road and Bridge Administration Co. Ltd.

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Copyright information

© The Minerals, Metals & Materials Society 2020

Authors and Affiliations

  1. 1.College of Material Science and EngineeringChongqing UniversityChongqingPeople’s Republic of China
  2. 2.Chongqing Cheng Tou Road and Bridge Administration Co. LtdChongqingPeople’s Republic of China

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