Abstract
In this study, FGH 98 superalloy parts were fabricated by laser solid forming (LSF) and the microstructure and defects of the LSF part were revealed using optical microscope and scanning electron microscope. It was found that the main defect in the LSF part was cracks. In order to analyze the phase transition process and crack mechanism, the temperature and stress fields were simulated. Based on the simulated result, Ni-Al phase diagram and morphologies of cracks, it can be concluded that the micro segregation caused by the rapid heating and cooling rates was the main reason for the crack defect.
Highlights
With the development of aeroengines, the increase of the working temperature demands more superior hightemperature mechanical properties for the material of aeroengine components
Laser solid forming (LSF), known as laser metal deposition (LMD) or laser engineered net shaping (LENS), is a typical additive manufacturing technology that combines the advantages of rapid prototyping and laser cladding
The main conclusions of this study are as follows: 1) FGH 98 superalloy parts were fabricated by LSF
Summary
With the development of aeroengines, the increase of the working temperature demands more superior hightemperature mechanical properties for the material of aeroengine components. Due to the high concentration of refractory elements and the inherent interaction capabilities among the complex precipitation strengthening phases in the FGH 98 superalloy, it is difficult to fabricate components with complex shapes using traditional processing methods [2,3]. Additive manufacturing (AM) technologies have been developed to produce complex-shaped parts due to its advantages in low production cost, low waste ratio of material and short production cycle. Laser solid forming (LSF), known as laser metal deposition (LMD) or laser engineered net shaping (LENS), is a typical additive manufacturing technology that combines the advantages of rapid prototyping and laser cladding. Compared to the traditional processing method, LSF can achieve near net shape forming of components without die. Based on the characteristics of simulation results and phase diagram of FGH98 superalloy, the microstructure evolution and crack mechanism in the LSF FGH98 superalloy part were explained
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