Abstract
Hot rolled non-oriented electrical steel samples were subjected to cold cross-rolling of 80 % reduction in thickness. The cross-rolled samples were then annealed at 650, 750 and 850 oC for 1 hr, 2 hrs and 4 hrs respectively. The role of cross-rolling on microstructure, texture and magnetic properties of the samples after annealing has been investigated. Two different samples were used for the present investigation - one had higher Al content (sample S1) while the other had higher C, Si, Mn, P and S content (sample S2). It was observed that the sample S1 had higher grain size compared to sample S2 after annealing. The cross-rolling was observed to be controlled the texture developments in the samples and it was found that the texture factor was identical in all directions of the sample. The core losses in the samples were found to be decreased with increasing grain size of the samples.
Highlights
To achieve adequate magnetic properties in all directions, both grain size and texture have been controlled through different thermo-mechanical processing of these steels[4,5,6,7]
Multistep cross-rolling (MSCR) has been observed to be an efficient method to randomize the texture of a material[12,13,14,15]
A distinct bimodal distribution of grains was observed during annealing of the sample S1 at lower temperature (650 oC) and at higher temperature of annealing, it had abnormal grain growth
Summary
Non-oriented electrical steels are widely used in electrical generators and motors where the magnetic field is important in all directions[1,2,3]. Texture components like (001) and (111) are considered respectively as good and bad texture components from magnetic properties point of view[9,10]. Multistep cross-rolling (MSCR) has been observed to be an efficient method to randomize the texture of a material[12,13,14,15]. During MSCR, the material is rotated by 90o in the intermittent steps of the rolling[16]. In the present study the effect of MSCR processing and subsequent annealing of hot rolled non-oriented electrical steels on microstructure, texture and magnetic properties of these steels have been investigated
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