Laser & Optoelectronics Progress, Volume. 54, Issue 10, 101409(2017)
Directional Solidification Microstructure and Segregation of SRR99 Superalloys by Selective Laser Melting
The directional solidification experiment of SRR99 Ni-based superalloys is conducted by the selective laser melting (SLM) method, and the microstructure, the phase composition, the element segregation of samples are measured. The results show that a good metallurgical combination between the deposition layer and the as-cast substrate is formed, and the deposited samples are composed of the γ and γ′ phases. There is a strongest diffraction peak both in the deposition layer and the as-cast substrate when the diffraction angle is 50.78°, which indicates that the growth orientation of the substrate gets well extended in the SLM deposition structure. The primary dendrite spacing is only 1-2 μm and the secondary dendrite arm degenerates and even disappears. The segregation ratio of each alloy element is close to 1 and the elements are uniformly distributed at the dendrite arms and the interdendritic space.
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Pan Aiqiong, Zhang Li, Wang Zemin. Directional Solidification Microstructure and Segregation of SRR99 Superalloys by Selective Laser Melting[J]. Laser & Optoelectronics Progress, 2017, 54(10): 101409
Category: Lasers and Laser Optics
Received: Apr. 11, 2017
Accepted: --
Published Online: Oct. 9, 2017
The Author Email: Aiqiong Pan (panaiqionga@163.com)