Preparation method of gh5188 engine heat shield by laser selective melting technology

Abstract

The invention discloses a method for preparing a GH5188 engine heat shield by laser selective melting technology, which belongs to the technical field of metal material additive manufacturing; the technical solution of this patent includes model processing; the raw material GH5188 alloy powder is taken and dried; after drying, it is loaded into the laser In the powder cabin of the selective melting and forming equipment, select the substrate, fix the substrate on the workbench, scrape the GH5188 alloy powder with a scraper, spread the powder on the substrate repeatedly, completely cover the entire substrate, lock the forming cabin, and place the powder in the forming cabin. Vacuumize and fill with inert gas for protection, and preheat the substrate at the same time; heat shield parts are printed; the formed heat shield parts are subjected to stress relief annealing, support removal, hot isostatic pressing and heat treatment; sample performance testing. The method of the invention realizes the integrated molding of heat shield parts, reduces the number of welding seams, and avoids welding cracks caused by welding.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing of metal materials, in particular to a method for preparing a GH5188 engine heat shield by laser selective melting technology. Background technique [0002] Laser selective melting technology (SLM) has the advantages of rapid response, complex structure integration, and mold-free forming. In terms of aerospace, it can significantly solve the development needs of "urgent, difficult, dangerous, and new" parts in the aerospace field; "Vertical" structural constraints to achieve high-performance, high-degree-of-freedom structural manufacturing, and promote the development of aero-engines to high thrust-to-weight ratios from the perspective of components. [0003] GH5188 is a Co-Ni-Cr based solid solution strengthened deformed superalloy, the alloy can be used at a temperature of 950°C-1100°C; the addition of tungsten element for solid solution strengthening makes the alloy have good cr...

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Problems solved by technology

[0003] GH5188 is a Co-Ni-Cr based solid solution strengthened deformed superalloy, the alloy can be used at a temperature of 950°C-1100°C; the addition of tungsten element for solid solution strengthening makes the alloy have good creep resistance, thermal fatigue resistance and High-temperature strength; at the same time, a relatively high content of chromium and a trace amount of lanthanum are added to make the alloy have good high-temperature oxidation resistance; it is widely used in the manufacture of aero-engine parts, such as heat shields, side walls, flame guides and other high-temperature components; However, in the production process, the GH5188 alloy ingot has obvious micro-segregation, and the subsequent heat treatment process cannot eliminate the micro-segregation, resulting in poor processing plasticity and welding cracking; GH5188 material uses laser selective melting technology, and there are few domestic and foreign studies. Documents explain its formability and performance

[0004] The heat shield parts of the engine are key components working in the high-temperature environment of the engine. They are assembled on the inner wall of the high-temperature area of ​​the engine and play a role in heat insulation; the quality of the heat shield parts determines the overall life of the engine. With the continuous development and maturity of engine technology, high-performance , The demand for high thrust-to-weight ratio engines is becoming more and more significant, resulting in the structure of heat shield parts becoming more complex and lightweight; the heat shield tends to be thinner and space-shaped, and it is difficult to adopt traditional manufacturing processes, and the number of welds is large. The processing process is long; at the same time, GH5188 alloy is a difficult-to-process material, which is prone to cracks during welding and has a high scrap rate

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