Comparative assessment of the fracture behaviour of micro-alloyed and API-5L X65 steels in simulated fuel grade ethanol environment

Joseph, O. O and Loto, C. A. and Sivaprasad, S. and Ajayi, J.A. and Tarafder, S. (2018) Comparative assessment of the fracture behaviour of micro-alloyed and API-5L X65 steels in simulated fuel grade ethanol environment. Engineering Fracture Mechanics. pp. 1-12.

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Abstract

In order to fully realize the benefit of pipeline and automotive materials in fuel ethanol applications, a comprehensive understanding of their fracture behaviour is essential. Very few studies have been undertaken on fracture of materials in stress corrosion environments. This paper presents a comparative assessment of the fracture toughness, tearing modulus and widths of stretch zones for API-5L X65 steel and micro-alloyed steel (MAS). The results show that MAS exhibits a better fracture resistance than API-5L X65 steel in air and in solution. API-5L X65 in solution shows a faster crack extension than MAS-in solution. It is found that Jstr (fracture toughness derived from stretch zone geometry) obtained for the two steels exhibits a similar trend with Ji (initiation fracture toughness) which is obtained at the departure of the blunting line on their J-R curves and thus suitable for representing the initiation toughness of the two steels in solution. In general, fuel ethanol reduces fracture resistance in X65 and micro-alloyed steels.

Item Type:	Article
Uncontrolled Keywords:	Steels Fracture mechanics Ductile fracture Fuel ethanol
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TP Chemical technology
Divisions:	Faculty of Law, Arts and Social Sciences > School of Education
Depositing User:	Mrs Patricia Nwokealisi
Date Deposited:	07 Nov 2018 11:37
Last Modified:	07 Nov 2018 11:37
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/12079

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