冷却速率及回火对降水的影响.pdfVIP

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冷却速率及回火对降水的影响.pdf

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冷却速率及回火对降水的影响

Materials Design Materials and Design 26 (2005) 486–492 /locate/matdes Inﬂuence of cooling rate and tempering on precipitation and hardness of vanadium microalloyed steel S. Gunduz a,*, R.C. Cochrane b ¨ ¨ a Karabuk Technical Education Faculty, Zonguldak Karaelmas University, 78200 Karabuk, Turkey ¨ ¨ b Department of Materials, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK Received 20 February 2004; accepted 28 July 2004 Available online 16 September 2004 Abstract 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 micro- alloyed steels using transmission electron microscopy revealed quite diﬀerent precipitate distributions. The type and sizes of the pre- cipitate 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