ORNL 3DP lattice structure
“Damage-tolerant metallic composites via melt infiltration of additively manufactured preforms” is a report of the work carried out by Oak Ridge National Laboratory and Rice University.

Combining Casting with 3DP to Customize "Damage Tolerant" Parts

Researchers infiltrate a stainless steel skeleton with molten aluminum

To date, product designers and manufacturers have viewed additive manufacturing as an alternative (or even a competitive threat) to more established forming processes, like molding or machining. And those assumptions are correct: AM or 3D printing can be used in place of casting parts, with advantages to be determined by the scale of production or the needs of a specific design. But, these technologies also can be used to optimize or improve aspects of the casting process, as in printing sand

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