| 摘要 |
A process for heat treatment of a metal workpiece, such as a casting (steel, aluminum based alloy or white cast iron). The casting is heated in a fluidized particulate bed (sand) to a relatively constant first temperature. Then, the casting is held (e.g., 3 hours) tightly packed against shape changes in the unfluidized bed until internal structural changes have occurred. Next, the casting is cooled in a fluidized particulate bed (sand) to a relatively constant second temperature. Then, the casting is held (e.g., 3 hours) tightly packed in the unfluidized bed until the desired internal structural changes are completed. The casting is removed from the bed for utilization as a heat treated product.
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