利用激光熔化沉积制造技术成形出AerMet100耐蚀超高强度钢薄壁板状试样，研究了其凝固组织及力学性能。结果表明，激光熔化沉积AerMet100板状试样具有细小均匀、无侧向分枝的快速凝固胞状组织及优异的力学性能。本文还分析讨论了往复式扫描激光熔化沉积过程中AerMet100钢“之”字形胞状组织的凝固过程并建立该“之”字形胞状组织基于胞晶择优外延生长的凝固过程物理模型。
The corrosion-resistant ultrahigh strength steel AerMet100 was fabricated by the laser melting deposition manufacturing technology. The as-solidification microstructure and mechanical properties of the laser deposited steel were investigated. The laser as-deposited steel has a rapidly solidified “zig-zag” full cellular structure and excellent room-temperature mechanical properties. The solidification mechanism of the zig-zag full cellular structure during the laser melting deposition process was discussed and a physical model based on selective epitaxial cell growth was proposed for the formation of the zig-zag full cellular structure.
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