System and method for grain refinement and general control of grain morphology in laser additive manufacturing

Patent · Tue Jan 12 00:00:00 EST 2021

OSTI ID:1805373

Roehling, Tien; Guss, Gabe; Khairallah, Saad A.; Matthews, Manyalibo Joseph; Wu, Sheldon S.

The present disclosure relates to a system for forming a material layer that may make use of an optical light source for generating an optical beam, and a beam shaping subsystem configured to shape the optical beam to generate a complex beam intensity profile. The complex shaped beam may be used to selectively melt at least portions of a bed of powder particles residing on a substrate during formation of the material layer, as the optical light source is moved. A computer may be used to control the optical light source. The complex beam intensity profile enables control over the microstructure of grains formed during melting of the powder particles as the material layer is formed.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC52-07NA27344
• Assignee: Lawrence Livermore National Security, LLC (Livermore, CA)
• Patent Number(s): 10,888,956
• Application Number: 16/010,111
• OSTI ID: 1805373
• Resource Relation: Patent File Date: 06/15/2018
• Country of Publication: United States
• Language: English