Solidification microstructure and mechanical properties of corrosion-resistant ultrahigh strength steel AerMet 100 fabricated by laser melting deposition

The corrosion resistant ultrahigh strength steel AerMet 100 with thin plate form was fabricated by laser melting deposition manufacturing. The laser as-deposited plate-like sample has a rapidly solidified zig-zag full cellular structure and excellent room-temperature mechanical properties. The longitudinal and transverse tensile strengths of the sample reached 1464 and 1402 MPa, and elongations 20.3% and 29.7%, respectively. The solidification mechanism was discussed and a physical model based on selective epitaxial cell growth was proposed for explaining the formation of the zig-zag structure.