Coherent and non-coherent nanophase composite reinforced ultra-high-strength maraging steel and manufacturing method thereof

Abstract

The invention discloses coherent and non-coherent nanophase composite reinforced ultrahigh-strength maraging steel and a manufacturing method thereof, and the ultrahigh-strength maraging steel comprises the following chemical components in percentage by weight: 2-10% of Ni, 0.5-2.0% of Al, 0.5-2.5% of Ti, 0.5-2.5% of Cu, 0-10% of Mn, 0-5% of Mo, 0-11% of Cr, 0-0.1% of C, 0.01-0.06% of B, not more than 0.04% of P, not more than 0.04% of S and the balance of Fe and inevitable impurities. N is not higher than 0.04%, and O is not higher than 0.05%; and the balance of Fe and inevitable impurities. The raw materials are subjected to smelting, rolling, solid solution treatment and aging treatment to prepare the coherent NiAl nanophase, coherent Cu-rich nanophase and non-coherent Ni3Ti nanophase composite reinforced ultrahigh-strength maraging steel, and excellent strength and plasticity matching and good welding and corrosion resistance are obtained. 本发明公开一种共格和非共格纳米相复合强化的超高强度马氏体时效钢及其制造方法，按重量百分比计，超高强度马氏体时效钢的化学成分包括：Ni为2‑10％，Al为0.5‑2.0％，Ti为0.5‑2.5％，Cu为0.5‑2.5％，Mn为0‑10％，Mo为0‑5％，Cr为0‑11％，C为0‑0.1％，B为0.01‑0.06％，P不高于0.04％，S不高于0.04％，N不高于0.04％，O不高于0.05％；其余为Fe和不可避免的杂质。原料经熔炼、轧制、固溶和时效处理，制成共格NiAl纳米相、共格富Cu纳米相和非共格Ni3Ti纳米相复合强化的超高强度马氏体时效钢，获得优异的强塑性匹配、良好的焊接和耐腐蚀性能。