FAILURE ANALYSIS OF HYDROGEN EMBRITTLEMENT IN SHIP GEARBOX HEX BOLTS

Received: 12 Feb 2024, Revised: 2 June 2022, Accepted: 25 July 2022, Available online: 28 Sep 2022, Version of Record: 28 Sep 2022

Mohd Moesli Muhammad1, Sayed Roslee Sayd Bakar2, Mohd Subhi Din Yati1, Nik Hassanuddin Nik Yusoff1 & Mahdi Che Isa1
1Marine Technology Research Group, Maritime Technology Division (BTM) 2Tropical Research Centre (TRC) Science & Technology Research Institute for Defence (STRIDE), Ministry of Defence, Malaysia Email: moesli.muhammad@stride.gov.my

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. Keywords: Failure analysis; brittle; voids; intergranular; hydrogen embrittlement.



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