Heating characteristics and hot rolling characteristics of die forged blades and bars used in fastener manufacturing. The batch materials used by the former Soviet Union to manufacture aviation blades were titanium alloy rods such as BT3-1, BT8, BT9, and OT4 with a diameter of 10-60mm. Materials for aviation fasteners generally use BT16 titanium alloy rods with a diameter of 4.0-16mm.
The heating characteristics and hot rolling characteristics of BT3-1, BT8, BT9, and OT4 alloys determine the requirements for bar quality. For example, when hot rolling at the temperature of the ot+p phase zone of the alloy, if the deformation is not less than 40%-50%, then the plasticity and fatigue strength indicators of this material are the highest. However, rolling at this temperature can significantly increase the deformation resistance of the blanking pass and the intermediate pass, increase the unit pressure, and overload the rolling mill's motor. 6al4v titanium bar / Grade 12 Titanium Rod / Grade 2 Titanium Round Bar
In this case, the rolling process should be carried out in two stages:
(1) Pre-milking at a temperature higher than a +p-P transition;
(2) Roll to finished size at the ot +P phase zone temperature of the alloy. In the final rolling stage, the rolled material should be cooled to a temperature below 650T.
Bars with a diameter greater than 8.0mm, and restocked bars with a diameter of 4.0-8.0mm, should be rolled in one pass.
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