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Method for improving processing property of FeCrNiAl-based high-entropy alloy

A high-entropy alloy and processing performance technology, applied in the field of metals and alloys, to achieve the effects of eliminating forging stress, reducing deformation dislocations, and improving plasticity and toughness

Active Publication Date: 2019-01-08
ANYANG INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are few reports on the relationship between the microstructure of high-entropy alloys and their processing properties.

Method used

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  • Method for improving processing property of FeCrNiAl-based high-entropy alloy
  • Method for improving processing property of FeCrNiAl-based high-entropy alloy
  • Method for improving processing property of FeCrNiAl-based high-entropy alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The as-cast high-entropy alloy is optimized for machinability. Its nominal chemical composition (at.%) is: 23Fe, 23Cr, 23Ni, 23Al, 8Cu. The as-cast metallographic photo is as follows figure 1 As shown, the average grain size is 30 μm.

[0031] In the first step, keep warm at 1250°C for 12 hours, and then cool to room temperature with water.

[0032] In the second step, at 1200°C, take it out after holding for 3 hours, and then start forging deformation at 1180°C, the final forging temperature is 1050°C, and the forging ratio is 1:6; then air cool to room temperature.

[0033] The third step is to perform periodic annealing treatment on the forged sample. The annealing temperature is 1160°C. After two cycles of annealing, it is air-cooled to room temperature.

[0034]The fourth step is to perform compression deformation on the above-mentioned processed sample (performed on the Gleeble thermal-mechanical simulation testing machine), the deformation temperature ranges fro...

Embodiment 2

[0036] Using the methods (1) to (4) above, the sample was kept at 1200°C for 18 hours, and then water-cooled to room temperature. And keep it warm at 1225°C for 1.5h before forging, and immediately carry out high-temperature forging. The initial forging temperature was 1200°C, the final forging temperature was 1060°C, and the forging ratio was 1:8, followed by three cycles of annealing at 1120°C. After 15% cold deformation at room temperature, observe the microstructure of the deformed alloy and analyze its rheological behavior. The results are as follows Figure 5 shown. Even after deformation at room temperature, no microcracks were observed in the microstructure, and the deformed macroscopic specimens remained intact.

Embodiment 3

[0038] An optimization process for optimizing machinability of a high-entropy alloy of another composition according to the method described above. The nominal chemical composition of the implemented alloy is: 23Fe-23Cr-23Ni-23Al-8Mo (at.%), and the sample is kept at 1280°C for 8 hours to fully homogenize and then cooled to room temperature. Free forging is carried out after holding at 1250°C for 2 hours. The initial forging temperature is 1160°C, the final forging temperature is 1030°C, and the forging ratio is 1:7. This was followed by 2 cycles of high temperature annealing at 1150 °C. Then it was compressed and deformed at 800°C, the deformation amount was 50%, and its structure was observed. The results are as follows: Figure 6 shown.

[0039] Implementation Effect

[0040] The inventors carried out thermal compression deformation with different parameters on the as-cast and treated high-entropy alloys, analyzed and simulated their rheological behavior to obtain their...

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Abstract

The invention belongs to the fields of metal material processing and heat treatment and relates to a method for improving the processing property of FeCrNiAl-based high-entropy alloy. An optimizing treatment process comprises high-temperature homogenization, forging and annealing, and particularly comprises the following steps: maintaining homogenizing treatment at 1200 to 1300 DEG C for 3 to 20 hours; performing forging with the deformation quantity of 1:9 to 1:5, wherein the forging deformation rate is not more than 10 s<-1>; and performing periodic annealing at the temperature of 1100 to 1250 DEG C and performing furnace cooling to room temperature. After the above optimizing treatment, high-entropy alloy avoids crack and cracking phenomena in cold and hot processing, a stable hot processing area is obviously enlarged and the processing property is significantly improved. Through high-temperature long-time heat insulation, high-temperature forging and periodic annealing process, thedefects of bulky arborescent structure, component segregation and micropores in the cast-state high-entropy alloy are effectively eliminated, so that the plasticity and the toughness of the high-entropy alloy are improved and the processing property can be optimized.

Description

technical field [0001] The invention is applicable to FeCrNiAl-based high-entropy alloys, metals and alloys with a face centered cubic (Face Centered Cubic, fcc) structure and a body centered cubic (Body Centered Cubic, bcc) structure. In particular, a technical method is provided for improving the processing performance of high-entropy alloys, and the invention belongs to the technical field of material processing and heat treatment. Background technique [0002] In 1995, Professor Ye Junwei from Tsinghua University in Taiwan Province of China broke through the design concept of traditional alloy systems and proposed a new design concept of alloy systems, which opened up a new era in the field of material research, that is, multi-component high-entropy alloys. The design concept of high-entropy alloys is based on one or two elements. It is composed of five or more elements. The atomic fraction of each element is greater than 5% but not more than 35%. Or it can be alloyed n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/02C22F1/16
CPCC22C30/02C22F1/002C22F1/16
Inventor 孙红英屈文红张勇吕军宋磊张阳明潘维煜
Owner ANYANG INST OF TECH
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