The invention relates to a method used for forming of
thick plate blanks from high-temperature direct
forging of TiAl
alloy powder, and belongs to the technical field of
hot working of TiAl
alloy. Themethod used for forming of the
thick plate blanks from high-temperature direct
forging of the TiAl
alloy powder comprises the following steps: firstly, filling to-be-machined jackets with the alloy
powder, sequentially conducting treatment of vacuumizing, heating and heat preservation, and vacuumizing to obtain powder
ingot blanks, and conducting
soldering and sealing on air vents; then placing the powder
ingot blanks into a high-temperature furnace, conducting heating to elevate the temperature to 1400-1440 DEG C, and then conducting heat preservation; then conducting
forging by adopting a forging
machine in radial directions of the powder
ingot blanks, and maintaining pressure for 20-30 s after forging is conducted, wherein under the
binding action of an upper die and a lower die of theforging
machine and the jackets, the alloy powder in the powder ingot blanks start to collide with each other, and is subjected to forming after being subjected to plastic deformation; and finally, placing the powder ingot blanks, subjected to forging and pressure maintaining, in air, conducting natural cooling until the temperature drops to a
room temperature, and removing the jackets. Comparedwith a hot isostatic pressure technology, the method used for forming of the
thick plate blanks from high-temperature direct forging of the TiAl alloy powder has the advantages that due to short
heating time, few PPB particles participate, and the plastic deformation amount is large, so that original PPB networks are thoroughly destroyed, and adverse effects of PPB on the mechanical performance ofthe material (TiAl alloy powder) can be reduced.