Al and Ti microalloyed high-strength, high-toughness and medium-entropy alloy and preparation method thereof

A technology of micro-alloying and entropy alloying, which is applied in the field of material processing, can solve the problems of less influence of plastic deformation on the structure and properties of medium-entropy alloys, poor mechanical properties of the workpiece, and high hardness, so as to improve the structure and performance, and improve the strength and toughness , the effect of excellent comprehensive performance

Inactive Publication Date: 2020-07-14

SOUTHEAST UNIV

4 Cites 13 Cited by

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Problems solved by technology

The mechanical properties of the workpiece prepared by rolling are relatively poor, and the hardness is too high, so it must be annealed to restore its mechanical properties

[0006] As a new alloy system, mediu...

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Abstract

The invention discloses an Al and Ti microalloyed high-strength and high-toughness medium-entropy alloy and a preparation method thereof. The alloy comprises (CoNiFe) 95Al5-xTix, wherein Co, Ni and Feare proportioned according to equal atoms, and a value range of x is 1-4. A preparation process route of the alloy comprises the steps of vacuum arc melting, homogenizing annealing, forging (hot forging), homogenizing annealing, rolling (cold rolling) and annealing heat treatment. The preparation method comprises the following steps of firstly, proportioning Co, Ni, Fe, Al and Ti particles/blocksaccording to a ratio, smelting the particles/blocks into ingots by adopting a vacuum arc melting method, and carrying out homogenizing annealing; secondly, after the cast ingots are heated to a certain temperature, carrying out forging forming, and then carrying out homogenizing annealing; and finally, preparing the forged alloy into a plate with the thickness of 1-1.5 mm through rolling (cold rolling), and performing annealing heat treatment at the temperature of 600-1000 DEG C. Through reasonable plastic processing and annealing heat treatment processes, the strength and toughness of the alloy can be improved, and the medium-entropy alloy with excellent comprehensive performance can be prepared.

Technology Topic

ForgingPlastic property +3

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Experimental program(4)

Example Embodiment

[0028] The preparation method includes the following steps:

[0029] 1) Place the Co, Ni, Fe, Al and Ti particles/blocks in a vacuum arc furnace according to the proportions, and vacuum to 1×10 -2 ~1×10 -3 Pa, the protective gas is argon, and the pressure in the furnace is 0.05~0.06MPa. During the smelting process, it is continuously turned over at least 5 times, smelted into an ingot, and the as-cast alloy ingot is homogenized and annealed.

[0030] 2) Forging the as-cast alloy ingot after homogenization annealing, and performing homogenization annealing on the forged alloy ingot.

[0031] 3) The forged alloy block is heated to 800-1000°C for rolling, and the rolled alloy block is subjected to annealing heat treatment.

[0032] The purity of the Co, Ni, Fe, Al and Ti particles/lumps mentioned in step 1) are all 99.97 wt.%.

[0033] The melting in step 1) is vacuum arc melting, and the melting current ranges from 100 to 300A.

[0034] Step 1) The homogenization annealing temperature is 900-1100°C, the holding time is 12-24h, and air cooling.

[0035] The forging process described in step 2) is to heat the as-cast alloy ingot to 800-1000°C, place it on a platform, and use a 20-40kg forging machine to perform multiple forgings, and finally forging to a length, width and height of 60-70mm respectively , 20~30mm, 3~5mm cuboid.

[0036] Step 2) The homogenization annealing temperature range is 900-1100°C, the holding time is 1-12h, and the cooling method is air cooling.

[0037] The rolling process described in step 3) is that, at room temperature, the homogenized and annealed forged blocks are successively subjected to relative reductions of 10, 20, 40, 60, 75, 85, and 90% (relative to the original forging The thickness of the block) is rolled to finally obtain a plate of 1.0 to 1.5 mm.

[0038] In step 3), the annealing temperature range is 600-1100°C, the holding time is 1-12h, and the cooling method is air cooling.

Example Embodiment

[0039] Example 1

[0040] The composition of the Al and Ti microalloyed high strength and toughness mid-entropy alloy of the present invention is (CoNiFe) 95 Al 4 Ti 1.

[0041] The preparation method of the Al and Ti microalloyed high-strength and toughness mid-entropy alloy is as follows:

[0042] 1) Put 16.52g of Co ingot, 16.45g of Ni ingot, 15.65g of Fe ingot, 0.96g of Al ingot and 0.42g of Ti ingot into a vacuum arc melting furnace, and evacuate to 1×10 -3 Pa, the protective gas is argon, the pressure in the furnace is 0.05 MPa, and the smelting is repeated 5 times to form an ingot. The as-cast alloy ingots are homogenized annealed at 1000℃, kept for 12h, and cooled in air.

[0043] 2) Forging the alloy ingot after homogenization annealing, and homogenizing annealing the forged alloy block.

[0044] First, place the forged alloy ingot in a muffle furnace and heat it to 900°C, then place the as-cast alloy ingot on the platform, and use a 40kg forging machine to perform multiple forgings. The final forged shape is 60mm in length, width, and height. 20mm, 4mm cuboid. Subsequently, the annealing temperature is 1000°C, holding for 1 hour, and air cooling.

[0045] 3) Roll the forged alloy block, and perform annealing heat treatment on the rolled alloy block.

[0046] At room temperature, the forged blocks that have been homogenized and annealed are rolled several times at a relative reduction of 10%, 30%, 50%, 65%, 75% (all relative to the original height, 4mm), and finally obtained 1.0mm plate. The annealing heat treatment temperature is 800° C., the temperature is kept for 1 h, and the mid-entropy alloy is obtained after air cooling.

Example Embodiment

[0047] Example 2

[0048] The composition of an Al and Ti microalloyed high-strength and toughness mid-entropy alloy of the present invention is (CoNiFe) 95 Al 3 Ti 2.

[0049] The preparation method of the Al and Ti microalloyed high-strength and toughness mid-entropy alloy is as follows:

[0050] 1) Put 16.46g of Co ingot, 16.39g of Ni ingot, 15.60g of Fe ingot, 0.71g of Al ingot and 0.84g of Ti ingot into a vacuum arc melting furnace, and evacuate to 1×10 -3 Pa, the protective gas is argon, the pressure in the furnace is 0.05 MPa, and the smelting is repeated 5 times to form an ingot. The as-cast alloy ingot is homogenized annealed at 1000℃, kept for 12h, and cooled in air.

[0051] 2) Forging the alloy ingot after homogenization annealing, and homogenizing annealing the forged alloy block.

[0052] First, place the forged alloy ingot in a muffle furnace and heat it to 900°C, then place the as-cast alloy ingot on the platform, and use a 40kg forging machine to perform multiple forgings. The final forged shape is 60mm in length, width, and height. 20mm, 4mm cuboid. Subsequently, the annealing temperature is 1000°C, holding for 1 hour, and air cooling.

[0053] 3) Roll the forged alloy block, and perform annealing heat treatment on the rolled alloy block.

[0054] At room temperature, the forged blocks that have been homogenized and annealed are rolled several times at a relative reduction of 10%, 30%, 50%, 65%, 75% (all relative to the original height, 4mm), and finally obtained 1.0mm sheet. The annealing heat treatment temperature is 800° C., the temperature is kept for 1 h, and the mid-entropy alloy is obtained after air cooling.

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Improve toughness
Improve organization and performance

Al and Ti microalloyed high-strength, high-toughness and medium-entropy alloy and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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