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    Effect of dynamic strain aging on mechanical properties of vanadium microalloyed steel
    (Maney Publishing, 2003) Gündüz, S; Cochrane, RC
    In the present work, the dynamic strain aging behaviour in microalloyed steels has been examined using a C-Mn-Al-V-N steel, which occasionally exhibits low toughness in the subcritical heat affected zone (HAZ). This may be attributed to dynamic strain aging, whereby materials show lower ductility and higher yield strength owing to the interaction between mobile dislocations and diffusing solute atoms. The research has shown that the high temperature tensile behaviour of C-Mn-Al-V-N steel depends on the presence of clusters believed to be of vanadium and carbon atoms. The interaction between dislocations and clusters of vanadium and carbon atoms at 200-450degreesC changes the work hardening rate and contributes to dynamic strain aging as confirmed in the present work. These interactions may also decrease toughness in the subcritical HAZ and lead to the subcritical embrittlement observed in the C - Mn -Al - V - N microalloyed steel.
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    Influence of cooling rate and tempering on precipitation and hardness of vanadium microalloyed steel
    (Elsevier Sci Ltd, 2005) Gündüz, S; Cochrane, RC
    In the present work precipitate distributions in a C-Mn-Al-V-N microalloyed steel and hardness were examined for as-received, heat-treated and heat-treated & tempered samples. Examination of as-received and heat-treated samples from the vanadium microalloyed steels using transmission electron microscopy revealed quite different precipitate distributions. The type and sizes of the precipitate particles and also hardness of the steel samples were markedly affected as the austenitisation time and cooling rates were changed. Tempering steel samples after air cooling produced fine matrix precipitates which are closely spaced, obstruct moving dislocations and hence make the steel harder. (c) 2004 Elsevier Ltd. All rights reserved.