Grain orientation dependence of microstructures in a warm rolled IF steel
- Center for Fundamental Research: Metal Structures in Four Dimensions, Materials Research Department, Riso National Laboratory, DK-4000 Roskilde (Denmark)
- Department of Materials and Metallurgical Engineering, IIT Kanpur, Kanpur 208 016 (India)
The microstructures of an IF steel warm rolled to 10% and 30% reductions have been characterised by transmission electron microscopy. Individual grains of various orientations, namely {gamma} grains within 15 deg of the {gamma} fibre (<1 1 1>//ND), {alpha} grains within 15 deg of the {alpha} fibre (<1 1 0>//RD) and R grains with orientations other than {gamma} or {alpha} grains, have been analysed. A common microstructural feature observed in all the grains studied is the development of a cell block structure where cell blocks are delineated by extended planar dislocation boundaries. However, the characteristics of the boundaries depend on the grain orientation. The extended dislocation boundaries preferentially form on or close (mostly within 10 deg.) to the {l_brace}1 1 0{r_brace} and {l_brace}1 1 2{r_brace} active slip planes and they also have macroscopic orientation with respect to the sample axes angles. The mean macroscopic angles are found to depend on the grain orientation. The large deviation of measured macroscopic angles (34 deg and -36 deg ) from the maximum shear plane orientations ({+-}45 deg ) observed in the {gamma} and {alpha} grains, and similar observations reported in the literature can be related to a strong correlation between the planes of the extended dislocation boundaries and the active slip planes.
- OSTI ID:
- 20634797
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 18 Vol. 52; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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