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- Title
FAILURE ANALYSIS OF HYDROGEN EMBRITTLEMENT IN SHIP GEARBOX HEX BOLTS.
- Authors
Muhammad, Mohd Moesli; Bakar, Sayed Roslee Sayd; Din Yati, Mohd Subhi; Yusoff, Nik Hassanuddin Nik; Che Isa, Mahdi
- Abstract
This paper presents the results of a failure investigation of hex bolts in a ship gearbox that failed during cruising. Failure analysis procedures were employed in this investigation. The results showed that the fracture occurred due to brittle failure. Voids were found on the fracture surface with intergranular cracks along with on metal grain boundaries. Hydrogen measurement was carried out and discovered that all the failed samples contained hydrogen in the range of 0.5 to 1.5 ppm. The chemical composition obtained showed that the bolts are low alloy steel with hardness greater than 30 HRC. It was concluded that the brittle failure of the hex bolts was due to hydrogen embrittlement. Hydrogen was produced during the corrosion process of the bolts and diffused into the voids. As a result, during mechanical loading, bolt strength and ductility both decreased.
- Subjects
HYDROGEN analysis; HYDROGEN embrittlement of metals; FAILURE analysis; LOW alloy steel; GEARBOXES; SURFACE cracks
- Publication
Defence S&T Technical Bulletin, 2022, Vol 15, Issue 2, p102
- ISSN
1985-6571
- Publication type
Article