【摘要】 对25Si Mn NIV钢亚温淬火组织观察分析表明:慢速加热有利于获得针状γ,条状α组成的纤维状复合组织,但晶粒遗传现象严重.中速加热时虽然只能获得部分纤维状复合组织,却可使晶粒细化。采用亚温淬火工艺时,要注意组织形态遗传和晶粒遗传的不同影响,以便充分发挥(α+M)复方组织的强韧化作用.更多还原

【Abstract】 The structures of 25 Si Mn Ni V steel after intercritical hardening are observed and analised. The results show that by heating at slow rate it can obtain the fibrous dual-phase microstructures composed of acicular and lamellar α, however, the phenomenon of grain inheritance is serious. On the other hand, the grains can be refined by heating at medial rate though only part of fibrous dual-phase structures are obtained.In order to bring the strenchening and toughening effect of the dual-phase structures (α+M) into full play, different effects of the structural inheritance and grain inheritance should be cared while intercritical hardening technology is being adopted.更多还原