Characterization of inclusions in steel: When not only size matters

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Mots clés : Metallurgy;Steel;Inclusions in steel
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Sommaire: The functional role of inclusions at low cutting speeds is to promote ductile fracture in chip formation process, whereas the role of inclusions at high cutting speeds is to prevent tool crater wear by surpressing the tribological phenomenon of seizure at the tool-chip interface at high cutting speeds. The viscous layer lubricates the tool-chip interface to prevent the seizure. In comparison with the large volume fraction of inclusions needed for promoting ductile fracture at low cutting...
Publication: CIM Bulletin
Auteur(s): S.V. Subramanian, H.O. Gekonde, X.Zhang, J.Gao
Mots clés: Metallurgy, Steel, Inclusion engineering, High speed machining
Numéro: 1021
Volume: 91
Année: 1998
Texte
Sommaire: In western Canada, many new wells contain a significant fraction of H2S. As well, many older wells become increasingly sour over their operating lifetime. For these reasons, there has been increased demand for linepipe and casing for sour service applications in recent years. This paper will review the metallurgical factors which must be cosidered in designing steels for such applications. IPCOÕs development of linepipe and casing, and experience in fabricating products to meet test standards...
Publication: CIM Bulletin
Auteur(s): L.E. Collins, R. Kruger
Mots clés: Metallurgy, Sour service applications, Steel
Numéro: 1021
Volume: 91
Année: 1998
Texte
Sommaire: Over the past twenty years, steel makers have introduced improved practices for reducing the inclusion content of steels. The success of these practice changes can be monitored in a variety of ways. Chemical analysis of the bulk sulphur and oxygen contents provides a relatively simple means to assess the impact of these changes. However, microscopical test methods are still needed to assess the nature of the inclusions present. Traditional chart-based measuremnet methods have wide acceptabili...
Publication: CIM Bulletin
Auteur(s): G.F. Vander Voor
Mots clés: Metallurgy, Inclusion measurement, Steel
Numéro: 1021
Volume: 91
Année: 1998
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