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- W87409843 abstract "ABSTRACT AT PRESENT, high strength sheet steel is more and more being used as automotive material for improving safety and for reducing fuel consumption by weight reduction. However, as far as thin cold rolled sheets for outer body panels are concerned, there has been few detailed investigations about the influences of processing conditions and microstructures on the forming properties required for those materials [l]. Among these properties, low initial yield strength, high work hardening rate, absence of discontinuous yielding and high R-value can be mentioned as important ones, together with ease of production and low cost. It is now well known that many of these properties can be found in dual-phase steels produced by intercritical annealing [2] except the high R-value which is texture dependent and therefore requires a proper processing for its development [3]. Al-killed steel has traditionally been the high-R-valued material used in autobodies, its texture being obtained by a near-70% cold rolling followed by a low heating rate (~40°C/h) long (~48 h) subcritical (~700°C) box annealing. Recent works [1, 4] have explored the possibility of developing a high R-value dual-phase Al-killed steel with claimed success. In the present work a commercial Al-killed hot rolled steel sheet is used in a similar attempt. Cold rolling reductions between TO and 90% were used followed by several long (~6h) and short (~5 min) annealing cycles reaching temperatures between 760 and 800°C. Work hardening, R and stretching properties are analysed and related to microstructure, second phase volume fraction and distribution and crystallographic texture, the latter being measured quantitatively by Crystallite Orientation Distribution Function (CODF) methods (see figure). In general, the results seem to indicate a marked influence of the second phase on the R-value though the final textures do not differ appreciably. This seems to be mainly due to differences in the heat treatments which influence the recovery and recrystallization behaviour responsible for the texture development in Al-killed steels [5]. The general behaviour is compared to the box annealed material." @default.
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- W87409843 date "1984-01-01" @default.
- W87409843 modified "2023-09-27" @default.
- W87409843 title "THE INFLUENCE OF MICROSTRUCTURE AND TEXTURE ON THE FORMING PROPERTIES OF A DUAL PHASE Al-KILLED STEEL" @default.
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- W87409843 doi "https://doi.org/10.1016/b978-1-4832-8372-2.50077-4" @default.
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