<正> 18Ni(350)马氏体时效钢是在18Ni(250)马氏体时效钢的基础上提高Co,Ti含量而形成的。对18Ni(250)钢的组织结构已经进行了较为系统的研究。提高Co,Ti含量使18Ni(350)钢时效后的强度明显高于18Ni(250)钢。关于18Ni(350)马氏体时效钢时效强化相的研究,已有很多报道,本文从时效结构的观察和分析入手,探讨18Ni(350)的强化机理并提出了合适的时效热处理制度。 试验用钢的化学成分(Wt-％)为:C0.007,Si0.005,Mn0.01,S0.005,P0.004,Co12.17,Ni17.99,Mo4.90,Ti1.31,A10.10,Fe余量。经双真空冶炼的钢锭,在
The aging structure and deformation structure of the 18Ni(350) maraging steel have been studied The dominant age strengthening phases are Ni_3Mo and Ni_3Ti, or Ni_3Ti and reverse austenite in the specimens after heat treating at 820℃ for 1 h, A.C.+480℃ for 3 h A.C., or at 820℃ for lh, A C+510℃ for 3 h, A.C. respectively A brittle zone is found in the specimen of under aging at 820℃, 1 h, A.C. +400—450℃, 3 h, A. C., This is, perhaps, resulted from an ordered or short range ordered martensite Imatrix The proper regime of aging at 510℃ for 3 h, A C. is available on the basis of structural analysis and property examination.
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