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研究15MnMoVN钢淬火后高温回火(500～700℃)铁素体微观结构和合金碳化物析出特征及Mo、V对其钢的组织与性能的影响后表明,铁素体基体在550～700℃回火时仍保持板条状形态而未发生再结晶;合金碳化物Mo_2C、V(C,N)的形成主要是以离位形核方式析出于基体中,在600℃回火时共格析出,其尺寸小于100(?),产生二次硬化,Mo_2C的析出对其硬化起主要作用;回火高于650℃硬度曲线陡降,Mo_2C,V(C、N)粒子均长大100(?)以上,同时因余留的渗碳体均球化长大及基体的回复,钢的韧性达到最佳值(大于120J/cm~2)。
The effects of Mo and V on the microstructure and mechanical properties of 15MnMoVN steel after high temperature tempering (500 ~ 700 ℃) ferrite microstructure and alloy carbides were studied. During tempering, the shape of lath remained without recrystallization. The formation of Mo 2 C and V (C, N) carbides precipitated in the matrix mainly by the ex-situ nucleation and coherently precipitated at 600 ℃ , The size of which is less than 100 (?), Resulting in secondary hardening. The precipitation of Mo_2C plays a major role in its hardening. When the tempering temperature is above 650 ℃, the hardness curve decreases sharply and the particles of Mo_2C and V (C, N) ), And meanwhile the toughness of the steel reached the optimum (more than 120J / cm ~ 2) due to the remaining cementite growing up and the matrix being recovered.