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High-strength heat-resistant high-entropy alloy and forging/rolling forming method

A high-entropy alloy and high-strength technology, applied in the field of high-entropy alloys, can solve the problems of high price of refractory elements, poor oxidation resistance, high room temperature brittleness, etc., and achieve the effect of obvious advantages in high-temperature strength, excellent plasticity, and high-temperature strength

Pending Publication Date: 2022-03-01
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-strength heat-resistant high-entropy alloy and its forging / rolling forming method, which overcomes the defects of high room temperature brittleness, high density, low elastic modulus, poor oxidation resistance, and high price of refractory elements.

Method used

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  • High-strength heat-resistant high-entropy alloy and forging/rolling forming method
  • High-strength heat-resistant high-entropy alloy and forging/rolling forming method
  • High-strength heat-resistant high-entropy alloy and forging/rolling forming method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The heat-resistant high-entropy alloy cast steel ingot of 5 kg is prepared by using a water-cooled copper plate vacuum induction melting furnace, and the specific preparation steps are as follows:

[0031] Step 1, select Al, Co, Cr, Fe, Ni, Mo, Nb, Hf, C raw materials with a purity of 99.9% and above, successively by mass percentage 8.05%, 17.57%, 15.5%, 16.65%, 32.82%, 6.79% %, 1.73%, 0.67%, 0.22% ingredients.

[0032] Step 2, melt the processed high-entropy alloy raw material in a vacuum electromagnetic induction furnace, and pour it into a water-cooled copper mold after melting;

[0033] Step 3, using circulating water cooling to achieve the purpose of rapid cooling.

[0034] figure 1 It is a 5kg grade ingot of the heat-resistant high-entropy alloy, and the ingot is complete without cracking and has few defects.

Embodiment 2

[0036]The sample is prepared by wire cutting, the sample is ground with silicon carbide paper, and then the surface is polished to make the surface of the sample smooth. The chemical etchant used to observe the alloy structure is ferric chloride and cupric chloride solution, and the electrochemical etchant is chromic acid aqueous solution. Chemical corrosion can be used to observe the Cr-rich and Mo-rich phases in the alloy, and can corrode the Ni-rich and Al-rich phases. The Ni-rich and Al-rich phases in the alloy were observed by electrolytic corrosion method. The microstructure of the high entropy alloy was observed by Hitachi S-4300 scanning electron microscope and Hitachi H-800 transmission electron microscope. Phase analysis instruments are German dual-channel scanning inductively coupled plasma atomic emission spectrometer (ICP-AES) and APD-10 X-ray diffractometer (CoKα, 30kV, 25mA). The scanning angle is 20°~100°, and the scanning speed is 4° / min.

[0037] figure ...

Embodiment 3

[0041] Tensile tests were performed using an Instran tensile tester. The room temperature tensile standard is GB / T 228.1-2010, and the high temperature tensile test standard is GB / T 228.2-2015.

[0042] Figure 6 It is the high-temperature performance of the alloy at room temperature. At 700°C, the tensile strength, yield strength, and elongation are 775MPa, 532MPa, and 23% respectively, wherein the tensile strength reaches about 85% of that at room temperature, and the elongation is about 85% at room temperature 700% of.

[0043] Table 1, Figure 7 AlCoCrFeNi is widely studied for the alloy and is currently stretchable and has heat-resistant potential 2.1 Compared with the high-temperature performance of AlCoCrFeNi high-entropy alloy at 700 °C, the high-temperature performance has obvious advantages.

[0044] Table 1 Comparison of the tensile properties of the alloy of the present invention and the existing alloy at 700 °C

[0045] alloy Yield strength / MPa ...

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Abstract

The invention discloses a high-strength heat-resistant high-entropy alloy and a forging / rolling forming method. The high-strength heat-resistant high-entropy alloy comprises the following chemical components in percentage by mass: 7.7%-8.3% of Al, 17.2%-17.8% of Co, 15.2%-15.8% of Cr, 16.3%-16.9% of Fe, 6.4%-6.9% of Mo, 1.4%-1.9% of Nb, 0.19%-0.24% of Hf, 0.51%-0.66% of C and the balance of Ni and other inevitable impurities. The tensile strength of the alloy at the temperature of 700 DEG C is not less than 770 MPa, the percentage elongation after fracture is not less than 20%, after an alloy ingot is annealed at the temperature of 600-800 DEG C, the thermoplasticity can be greatly improved, forging / rolling forming can be achieved, and the alloy has excellent hot working formability and high high-temperature strength and plasticity matching.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloys, in particular to a high-strength heat-resistant high-entropy alloy and a forging / rolling forming method thereof. Background technique [0002] In 2004, Ye Junwei et al proposed the design concept of alloy composition with 5 principal elements and above, which is called high-entropy alloy. High-entropy alloys are considered to have important research value and application prospects in the field of heat-resistant and high-temperature-resistant materials due to their high mixing entropy, which can inhibit the formation of intermetallic compounds at high temperatures, and have strong solid solution strengthening and hysteretic diffusion effects. At present, the research direction of heat-resistant high-entropy alloys is mainly divided into two aspects. On the one hand, adding an appropriate amount of alloying elements such as Ti, Hf, Nb, Mo, and W to the AlCoCrFeNi system to improve high-...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C22F1/00B21J5/00
CPCC22C30/00C22C19/056C22C1/02C22F1/10B21J5/002B21B2201/06
Inventor 赵吉庆杨钢包汉生何西扣刘正东叶奇鲁王立民程杰锋
Owner CENT IRON & STEEL RES INST
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