System and method of increasing cooling rate of metal sand casting during solidification

A system for increasing a cooling rate of a metal sand casting, comprising:

• a sand mold defining a mold cavity, and a coolant inlet port extending into the sand mold, wherein the coolant inlet port is operable to receive a cryogenic liquid, wherein the sand mold includes:
• a permeability sufficient for the cryogenic liquid to transform into a gas phase while permeating through the sand mold;
• a myriad of coolant passageways surrounding a portion of the mold cavity, wherein the coolant passageways are in fluid connection with the coolant inlet port and operable to accommodate the cryogenic liquid changing from a liquid phase to the gas phase;
• and
• a coolant gas outlet port in fluid communication with the coolant passageways;
• and
• a coolant vapor extraction system having a collection manifold in fluid connection with the coolant gas outlet port of the sand mold.

A method of increasing a cooling rate of a metal sand casting, comprising:

• pouring molten metal into a mold cavity defined by a manufactured sand mold;
• introducing a liquid nitrogen in the manufactured sand mold such that the liquid nitrogen transforms from a liquid phase to a gas phase as the nitrogen permeates through the manufactured sand mold, thereby increasing a cooling rate of the molten metal;
• 3-D printing the manufactured sand mold, before pouring the molten metal, to define the mold cavity, a passageway surrounding a portion of the mold cavity, and an inlet port in fluid connection with the passageway;
• wherein the inlet port is operable to receive the liquid nitrogen and the passageway is operable to channel the liquid nitrogen as the liquid nitrogen transforms from the liquid phase to the gas phase;
• and
• extracting the gas phase from the manufactured sand mold by applying a vacuum.