Microstructures and Texture Development of the Cross-Roll Rolled AZ31 Alloy Sheet at High Temperature

Abstract

The texture development and microstructural evolution have been investigated for the AZ31 alloys rolled by cross-roll rolling at 823 K. After the AZ31 magnesium sheets were rolled by cross-roll rolling at 823 K, the total reduction in thickness of 65% were achieved after two pass rolling. The resultant microstructures are homogeneous and refined for the surface and center layers. The (0002) basal texture is significantly weakened after annealing at 623 K for 1 h for the cross-roll rolled sheets.

Valorisation of steelmaking slag by microwave treatment

“…For comparison, T. Fe in our previous investigation employing a synthetic slag and T. Fe in the investigation by Morita et al employing both synthetic and industrial slag were plotted together. 8,9 In the present study, T. Fe in the slag decreased with increasing C eq. and showed a minimum at around C eq.…”

“…The experimental procedure was the same as our previous studies. 6,9 Figure 1 shows a schematic diagram of the microwave furnace (MM-344 L, 2?45 GHz, 1?7 kW, LG). A well mixed slag-graphite powder mixture sample was charged in an alumina crucible (outer diameter, 39 mm; inner diameter, 36 mm; height, 29 mm).…”

“…The crucible was placed in a unit of refractory bricks which was then placed at the centre of the microwave furnace and irradiated for 15 min, which was optimised in the previous study. 9 During the experiments, the temperature was monitored using a two-colour pyrometer (IR-HQH2, 873-2273K, CHINO) through a hole on the upper part of the refractory block. Temperature increased rapidly up to y1800 K in 6 min, keeping at this temperature for 9 min.…”

“…As a reducing agent and a heating axillary, graphite powder was used, which was shown to be a very efficient heat generator under microwave treatment. 9 The average diameter of the graphite powders was 2?260 mm.…”

“…Morita et al have found in their microwave treatment of steelmaking slag (1?6 kW, 2?45 GHz) that both Fe and P could be quickly recovered as a form of Fe-C-P alloy; thus, they suggested the use of microwave heating for steelmaking slag recycling. 7,8 Recently, Kim and Lee carried out similar experiments with a synthetic CaO-SiO 2 -FeO-P 2 O 5 slag and found a way to increase the recovery ratio of P. 9 They found that the heating of a carbon-slag mixture was dominated by carbon heating, and a maximum recovery rate was obtained by 900 s microwave treatment (1?7 kW, 2?45 GHz) when 15 g of the synthetic slag and 0?816 g of graphite mixture were used. They found that the T. Fe in the slag after microwave treatment showed a strong effect on the partition ratio of P between slag and metal (L p ), namely, as T. Fe decreased, the L p value decreased considerably.…”