激光与光电子学进展, 2017, 54 (10): 101409, 网络出版: 2017-10-09
选区激光熔化SRR99高温合金的定向凝固组织及偏析 下载: 502次
Directional Solidification Microstructure and Segregation of SRR99 Superalloys by Selective Laser Melting
激光技术 选区激光熔化 定向凝固组织 偏析 laser technique selective laser melting directional solidification microstructure segregation
摘要
采用选区激光熔化(SLM)成形方法, 对SRR99镍基高温合金进行了定向凝固实验, 测试了试样的显微组织、相组成及元素偏析情况。结果表明, 沉积层与铸态基板间能形成良好的冶金结合, 沉积试样组织由γ相和γ′相组成, 沉积层与铸态基板组织在衍射角为50.78°时均有一个最强衍射峰, 基板的生长取向在SLM沉积组织中得到了很好的延续, 且试样的一次枝晶间距仅为1~2 μm, 二次臂退化甚至消失。各合金元素的偏析比均接近1, 元素在枝晶间和枝晶干的分布较均匀。
Abstract
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.
潘爱琼, 张莉, 王泽敏. 选区激光熔化SRR99高温合金的定向凝固组织及偏析[J]. 激光与光电子学进展, 2017, 54(10): 101409. 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.