Pulse current assisting titanium-TiAl composite plate non-sheath rolling method
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A pulsed current, composite plate technology, applied in metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of high cost, low strength and plasticity, uneven thickness, etc. control deformation, improve plastic deformation ability, uniform and fine grain effect
Active Publication Date: 2020-01-21
TAIYUAN UNIV OF TECH
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[0004] The present invention overcomes the problems of small size, uneven thickness, large component deviation, low strength and plasticity of the plate prepared by the titanium-TiAl composite plate foil metallurgy method, and the high cost of the sheathed hot rolling method, complicated process, and difficult rolling process. High temperature, the quality and performance of the clad plate need to be further improved, and a pulse current assisted titanium-TiAl clad plate uncoated rolling method is provided
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Embodiment 1
[0043] The preparation method of TC4 / Ti-44Al-8Nb-(B, Y) alloy composite plate is as follows:
[0044] Step 1. Titanium alloy sheet preparation:
[0045] a. Melting TC4 (Ti-6Al-4V) titanium alloy by vacuum induction suspension melting method to obtain a cylindrical ingot with a diameter of 100mm and a height of 180mm;
[0046] b. Cut off the riser of the ingot and remove the surface scale, then place the billet in a box-type vacuum heat treatment furnace at 950°C for 30 minutes, and use a hydraulic forging machine to -1 The strain rate of the titanium alloy billet is thickened, and the total deformation is 70%. After the thickening is completed, the billet is placed in a vacuum heat treatment furnace at 400 ° C for 2 hours, and the furnace is cooled;
[0047] c. Remove scale from the pier-thick billet, smooth the surface, cut the core of the forging cake and process it into a standard rectangular block, process chamfering at the front end of the billet deformation, place it in...
Embodiment 2
[0069] The preparation method of BT16 / Ti-43Al-4Nb-2Mo-2V alloy composite plate is as follows:
[0070] Step 1. Titanium alloy sheet preparation:
[0071] a. Melting BT16 (Ti-3Al-4.5V-5Mo) titanium alloy by vacuum induction suspension melting method to obtain a cylindrical ingot with a diameter of 100mm and a height of 180mm;
[0072] b. Cut off the riser of the ingot and remove the surface oxide skin, then place the billet in a box-type vacuum heat treatment furnace at 1000°C for 60 minutes, and use a hydraulic forging machine for 0.05s -1 The strain rate of the titanium alloy billet is thickened, and the total deformation is 80%. After the thickening is completed, the billet is placed in a vacuum heat treatment furnace at 500 ° C for 2 hours, and the furnace is cooled;
[0073] c. Remove scale from the pier-thick billet, smooth the surface, cut the core of the forging cake and process it into a standard rectangular block, process chamfering at the front end of the billet def...
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Abstract
The invention relates to the field of preparing of alloy materials, in particular to a pulse current assisting titanium-TiAl composite plate non-sheath rolling method. The pulse current assisting titanium-TiAl composite plate non-sheath rolling method aims at solving the problems that a plate prepared through an existing foil metallurgy method for titanium-TiAl composite plates is small in size, not uniform in thickness, large in component deviation and low in strength and plasticity, and the problems that a sheath hot rolling method is high in cost, complex in technology and high in rolling temperature, and the quality and performance of composite plates need to be further improved are solved. The pulse current assisting titanium-TiAl composite plate non-sheath rolling method includes thespecific steps that firstly, a titanium alloy plate is prepared; secondly, a TiAl alloy plate is prepared; thirdly, non-sheath assembling is conducted; fourthly, pulse current auxiliary hot rolling is conducted; and fifthly, separating and subsequent treatment are conducted, and a titanium-TiAl composite plate can be obtained. The composite plate obtained in the pulse current assisting titanium-TiAl composite plate non-sheath rolling method is good in surface quality, free of oxide layer disengagement, free of edge portion and end portion cracking, uniform and small in plate organization, good in bonding interface and good in mechanical performance.
Description
technical field [0001] The invention relates to the field of preparation of alloy materials, in particular to a pulse current assisted rolling method of a titanium-TiAl composite plate without sheathing. Background technique [0002] TiAl alloy (γ-TiAl-based intermetallic compound) is a new type of lightweight high-temperature structural material with high specific strength and specific modulus, good high-temperature creep resistance and oxidation resistance, and its service temperature can reach 850 ° C. Plates have broad application prospects in the aerospace field. However, since TiAl alloy is a difficult thermoplastic deformation material, the thermal processing window is small, the material is prone to instability and cracking during rolling, and the mechanical properties of the sheet at room temperature are poor, and the machining and assembly capabilities are poor, which seriously hinders the development and application of TiAl alloy sheets. Titanium alloy has good h...
Claims
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