Studies on Cladding

Two kinds of light metal having different flow resistance were bonded by hot-rolling, hot-extrusion and cold-rolling. In the case of cladding by cold-rolling, the combination of titanium and aluminium alloy (24S) were bonded for the investigation of some defects such as ripple and crack. The satisfactory conditions were obtained under which the bonding without defects could be made

Secular Change after Cold-Working and Anneal-Hardening of α Brass

The secular change after cold-working and anneal-hardening of 70/30 brass was measured by the hardness and the spring test. An increase in hardness and a decrease in bending deflection were observed at room temperature after cold-working, especially in high reduction specimens. As in the previous work on 60/40 brass, the change after anneal-hardening of 70/30 brass was influenced by the length of time from final cold-rolling to heat-treatment, and by the heating time of anneal-hardening. In general, the longer the times, the less the change. Heat-treatment was carried out at 200℃ for 15 min～3 hrs after the speciments had been allowed to remain at 40℃ for various durations following the final cold-rolling

Grain Behaviour in 70/30 Brass Plate Heat-Treated Rapidly at High Temperatures

The grain behaviour in 70/30 brass plate at high temperatures was investigated by means of the rapid-heating method, and its applicability to controlling the grain size was also considered. It was observed that the effects of impurities, rolling reduction and ready-to-finish grain size were much reduced than in the case of the ordinary batch-annealing method at lower temperatures. The non-uniform mixed grain size observable sometimes at lower temperatures could be avoided, and the scale formation by oxidation was comparatively slight. However, it should be noted that the material slightly cold-rolled showed a grain growth although no recrystallization could be observed

Study on the Rolling of Metals and Alloys with Sendzimir Reversing Cold Strip Mill. I : Pattern of Waves Appearing on the Metal Foils

In the rolling of metal foils with Sendzimir reversing cold strip mill of ZR 32-4 type, the regularly spaced waves inclining to the rolling direction were sometimes observed on the foil surface. The occurrence of the waves was dependent on the front tension, but not essentially on the back tension. These waves were thought to be a kind of the center buckling of strip, but not to be the stretcher strains produced in aluminium alloys and mild steels, nor to be the herring-bone markings observed in copper alloys