Journal
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
Volume 27, Issue 2, Pages 236-243Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2017.02.008
Keywords
Superalloys; Porosity; Withdrawal rate; Microstructure; Quantitative evaluation
Funding
- National Natural Science Foundation of China [51331005, 51501152]
- National High Technology and Development Program of China [2012AA03A511]
- Natural Science Foundation of ShaanXi Province [2014JM622, 2016JQ5093]
- Northwestern Polytechnical University (NPU) Foundation for Fundamental Research [NPU-FFR-3]
- Fund of the State Key Laboratory of Solidification Processing in Northwestern Polytechnical University (NPU) [SKLSP201411]
- Strengthened Industrial Foundation Project of Ministry of Industry and Information Technology of China [TC160A310-12]
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The influence of withdrawal rate on the porosity in a third-generation Ni-based single crystal superalloy was investigated by a quantitative evaluation method. The results showed that the withdrawal rate obviously effected on the average area fraction, number and diameter of porosities except their radius ratios. In consideration of the microstructure observation for dendrite arms, an optimized withdrawal rate was obtained with a minimum porosity level as about 125 mu m s(-1). Simultaneously, a threshold value for the acceptance level of porosities might be set as about 0.1% in order to fulfill the requirements for Ni-based single crystal casting in laboratory scale. Finally, the formation reason of porosity was discussed and it was concluded that the feeding for the volume shrinkage of the last solidified eutectic liquids from the residual liquids and the isolating effect of the morphologies of dendrite arms might be two key factors in controlling the porosities level in Ni-based single crystal superalloy.
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