Method for reducing local defects in a solidified casting

A method for reducing local defects or for improving local microstructure in locations with a solidified casting, the method comprising the steps of:

• preparing an elongated bar for each one of the identified locations, the bar comprising a first end and a second end, the first end for contacting the casting and the second end connected to a driving means;
• preparing at least one anvil;
• preparing a driving means for each elongated bar;
• placing the casting on at least one anvil and placing a bar at each identified location on the casting, with the bar at one side and the anvil at the opposite side of the casting at that location;
• bringing the temperatures in the locations of the casting to predetermined temperatures;
• and
• driving each bar to plastically deform the casting locally to improve the local microstructure in each identified location in the casting at predetermined forces, times, and deformation rates,
• whereby the local microstructure in each identified location in the casting is improved by closing or reducing porosity and cracks, breaking up oxide films and segregation bands, and refining solidification structure.