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Article
Effect of Heat Treatment Parameters on Microstructure and Mechanical Properties of (Aisi1005) Steel

Authors: Hassanen L. Jaber --- R. k. Salim, --- Ashraf S. Fahad
Journal: University of Thi-Qar Journal for Engineering Sciences مجلة جامعة ذي قار للعلوم الهندسية ISSN: 26645564/26645572 Year: 2016 Volume: 7 Issue: 2 Pages: 46-55
Publisher: Thi-Qar University جامعة ذي قار

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Abstract

This study aims to investigate tensile properties and work hardening behavior of dual phase(DP) steels. A series of DP steels containing ferrite and martensite with different volumefractions of martensite (Vm) were produced by intercritical heat treatment. Microstructuralinvestigations, hardness test, and tensile test were carried out. The experimental results showedthat dual phase steels at 760oc and 10s have excellent mechanical properties in terms of tensilestrength, ductility and fracture energy. A further increase in Vm was found to increase tensilestrengths and ductility. The increasing and then decreasing trend in tensile strength is in contrastto the law of mixture. These unusual behaviors are discussed and explained. Work hardeningbehavior was analyzed in terms of Holloman analysis.


Article
Active Brazing of Tantalum – to – Tantalum
لحام المونه الفعال للتتاليوم

Authors: Nashwa A. A. Sa'ad --- F. A. Hashim --- R. K Salim
Journal: University of Thi-Qar Journal for Engineering Sciences مجلة جامعة ذي قار للعلوم الهندسية ISSN: 26645564/26645572 Year: 2010 Volume: 1 Issue: 1 Pages: 37-47
Publisher: Thi-Qar University جامعة ذي قار

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Abstract

The aim of this study is to start a work about the bonding mechanism of tantalum -to-tantalum brazed by active filler metal alloy which basely stand on using copper or silver with active element such as titanium. Brazing will happen under inert gas (argon). Ag4Wt% Ti,Cu8wt%Ti , and the eutectic Ag 26wt% Cu 4 wt % Ti are the active filler metal which are used , and the bonding phases at the filler metal / tantalum interface line almost contain ( Ti Ta Ta 0.49 O ) . Which means that active element ( titanium ) shares oxygen with tantalum to make this bond as a cheap filler .

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