Investigation On The Fracture Toughness Of Welded Pressure Vessel Steel

Suhaily , Mohamad Yusof (2009) Investigation On The Fracture Toughness Of Welded Pressure Vessel Steel. Project Report. UTeM, Melaka,Malaysia. (Submitted)

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Abstract

This report covers the investigation on the fracture toughness of welded pressure vessel steel. Failures occur for many reasons, including uncertainties in the loading or environment, defects in the materials, inadequacies in design, and deficiencies in construction or maintenance. Design against fracture has a technology of its own, and this is a very active area of current research. In this study, fracture toughness test have been conducted for A516 Grade 70 steel and the results has been carried out using K1c calculations for fracture toughness. It is shown that the ductile fracture occurs by the redirection of the crack propagation from the HAZ to the weld metal. Analysis by optical microcopy and SEM has revealed that the improvement in the toughness, and thus the higher resistance to crack propagation in the HAZ, is due to the presence of a large proportion of fine acicular ferrite. Correlation of the result and failure of pressure vessel phenomenon is also analyzed.

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