Articles with multiple grain structures for use in high stress environments

摘要

A method of forming an article includes heating a metal to form a molten metal having a metal temperature, heating the mold to a mold temperature greater than or equal to the metal temperature, introducing the molten metal into the mold, and melting Cooling the first portion of the metal while maintaining the second portion of the molten metal at a metal temperature, the first portion having a first side and a second side; The second side is opposite the first side and is adjacent to the second portion, and the cooling step is such that the solidification interface proceeds from the first side to the second side. Gradually cooling the portion from the first side to the second side, and cooling the remainder of the molten metal from a plurality of directions after the first portion is cooled below the crystallization temperature. Steps. [Selection] Figure 1