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US 12,502,708 B2Granted
Method for reducing local defects in a solidified casting
OwnerQingyou Haninventor
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Abstract
A process of reducing internal defects or enhancing mechanical properties in local regions in a solidified casting utilizes the combination effect of compression, high-intensity ultrasound, and heat on improving the local microstructure. The casting is brought to predetermined temperatures where plastic deformation in the local regions of the casting is produced under controlled conditions to close voids, breakup oxide films, and refine solidification structure.
Claims8
A method for reducing local defects or for improving local microstructure in locations in a casting solidified, the method comprising the steps of:
- providing one elongated bar and one driving means for each one of the locations in the casting, the elongated bar comprising a first end and a second end, the first end for contacting the casting and the second end connected to the respective driving means;
- providing at least one anvil;
- placing the casting on the at least one anvil and placing each elongated bar at each one of the locations on the casting, with the elongated bar at one side and the at least one anvil at the opposite side of the casting at each location;
- bringing temperatures at the locations of the casting to predetermined temperatures;
- and
- driving each elongated bar to plastically deform the casting locally at predetermined forces, times, and deformation rates,
- whereby the local microstructure in the casting is improved by closing or reducing porosity and cracks, breaking up oxide films and segregation bands, and refining solidification structure.
4 more elements
Dependencies are inferred from the claim text.