Figure 6. Macrostructures of 356 ingots: 1—after vibration by 100 Hz; 2—after vibration by 150 Hz; 3—after vibration by 200 Hz; 4—after modification by ultrafine powder modifier; 5—after modification by ultrafine powder modifier followed by 100 Hz vibration; 6—after modification by ultrafine powder modifier followed by 150

Figure 6. Macrostructures of 356 ingots: 1—after vibration by 100 Hz; 2—after vibration by 150 Hz;
3—after vibration by 200 Hz; 4—after modification by ultrafine powder modifier; 5—after
modification by ultrafine powder modifier followed by 100 Hz vibration; 6—after modification by
ultrafine powder modifier followed by 150