| Strategy | Modification | Result | |----------|--------------|--------| | Reduce Mn | 12% → 9% | Freezing range 190°C → 150°C; no cracks | | Add grain refiner | 0.05% Zr | Finer equiaxed grains; crack length reduced 70% | | Reduce cooling rate | 5°C/s → 1°C/s from 950°C | Eliminated cracks in original composition | | Eliminate P | <0.005% | Reduced intergranular embrittlement |
Turn off "Mutual Heating" or "External Heat Sources" temporarily. cymcap hot crack
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