MATEC Web Conf.
Volume 242, 2018International Conference on Advanced Functional Materials and Composites (ICAFMC2018)
|Number of page(s)||5|
|Published online||05 December 2018|
Analysis of crack mechanism in FGH 98 superalloy during the laser solid forming process
1 Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
2 Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control, Tsinghua University, Beijing 100084 China
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.
Key words: FGH 98 superalloy / Microstructure / Defects / Crack mechanism / Laser solid forming
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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