激光熔化沉积AerMet 100耐蚀超高强度钢的凝固组织及力学性能

利用激光熔化沉积技术制备了AerMet 100耐蚀超高强度钢薄壁板状试样.结果表明,试样具有细小均匀、无侧向分枝的快速凝固胞状组织及优异的力学性能,其室温下的纵向和横向抗拉强度分别达到1464和1402 MPa,延伸率分别达到20.3%和29.7%.讨论了往复式扫描激光熔化沉积过程中"之"字形胞状组织的凝固过程,并建立了基于胞晶择优外延生长的物理模型.

Solidification microstructure and mechanical properties of laser melting deposited Corrosion-Resistant ultrahigh strength steel AerMet100

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 sampl e 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 .