A high-throughput method for powder alloy preparation and thermal consolidation forming process development

Abstract

The invention relates to a high-throughput method for powder alloy preparation and thermal consolidation process development, covering the entire process of powder alloy composition design, preparation, thermal consolidation forming process development and performance testing, and provides a rapid process for powder alloy development . The alloy powder is prepared by the ball milling method. During the process, different elements and different contents of alloy powder or element powder can be added to realize the preparation of alloy powder with different components. The powder thermal consolidation forming sheath is disclosed. The alloy powder is contained in the sheath, and vacuum is used after vibration Electron beam or laser sealing and welding, the powder sheath is thermally consolidated and formed under different process conditions, followed by hardness testing, establishing alloy composition-thermal consolidation process-performance relationship, screening optimal composition and process data, and designing for alloy composition And thermal consolidation forming process development to provide experimental basis. The invention aims to solve the problems of long development period, high cost and unreasonable thermal consolidation process of the existing powder alloys.

Description

technical field [0001] The invention discloses a high-throughput method for powder alloy preparation and thermal consolidation forming process development, which belongs to the technical field of powder metallurgy material preparation. Background technique [0002] At present, methods such as hot extrusion, hot isostatic pressing, and sintering are usually used to prepare the alloy powder to the alloy block. When the powder is hot-extruded and consolidated, the selection of process parameters is unreasonable, which will cause the microstructure of the material to be deformed. Uniform, if the temperature is too high, it will lead to coarse grains and second phases, resulting in a decrease in alloy performance; when the temperature is too low, the deformation resistance becomes larger, and dislocations are easy to coil at the grain boundary, resulting in an increase in local stress and intergranular cracking , Alloy cracking and scrapping phenomenon. At present, the determina...

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Problems solved by technology

[0002] At present, methods such as hot extrusion, hot isostatic pressing, and sintering are usually used to prepare the alloy powder to the alloy block. When the powder is hot-extruded and consolidated, the selection of process parameters is unreasonable, which will cause the microstructure of the material to be deformed. Uniform, if the temperature is too high, it will lead to coarse grains and second phases, resulting in a decrease in alloy performance; when the temperature is too low, the deformation resistance becomes larger, and dislocations are easy to coil at the grain boundary, resulting in an increase in local stress and intergranular cracking , the alloy is cracked and scrapped

At present, the determination of the powder alloy thermal consolidation forming process is still mainly based on the trial and error method. The thermal consolidation forming often requires the cooperation of multiple large-scale equipment to complete, so the cost of a test is tens of thousands or even tens of millions of yuan, which is high. It takes several weeks or months to complete a test, the cycle is long, and the amount of powder used in a test needs several kilograms, which further increases the test cycle and cost. The high test cost and long cycle eventually lead to a very wide choice of test process parameters, resulting in alloy heat The development of the consolidation forming process is not accurate, and the optimal thermal consolidation forming process of the alloy cannot be accurately obtained

At the same time, different alloy powders have different optimal thermal consolidation forming processes, which add great difficulties to the development of powder alloys

[0003] Traditional powder alloy preparation and process development have problems such as long process development cycle and high cost

In recent years, some new powder metallurgy rapid prototyping methods have emerged, such as 3D printing (Chinese patent 201310011857.9), but there are still many problems in the production process, such as difficult to control the structure, easy to crack, and continuous expansion of available materials. It is difficult to replace traditional methods

The development of computers has promoted the research and development of materials in some aspects, and some forming simulation software has played a certain role in process development. For example, DEFORM software can simulate the thermal consolidation forming process by computer, which reduces the cost of expensive field tests to a certain extent. , which shortens the development cycle of the powder thermal consolidation forming process, but there are problems such as high software cost and the accuracy of simulation to be verified, and it cannot cover the whole process from composition design to performance extraction

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