材料期刊网

在普通Cr-Mo-B系低合金耐磨钢成分基础上，通过添加适量的钒、氮元素，研究钒氮微合金化对轧后直接淬火（DQ）+低温回火耐磨钢板组织及性能的影响。结果表明：无钒氮钢板的微观组织为板条马氏体组织，-20℃冲击功为15 J，布氏硬度为443HBW。分别添加质量分数0.088%V-0.013%N和0.089%V-0.029%N的2种钒氮微合金化的钢板，板条马氏体组织明显细化，在组织中发现存在少量针状铁素体组织。2种钢板的-20℃冲击功分别提高至30和42 J，质量分数0.089%V-0.029%N的钢板强度、硬度与无钒氮钢板基本一致。低温轧制过程中析出的V（C,N）颗粒起到定扎奥氏体晶界、抑制晶粒长大作用。在860℃温度终轧及轧后弛豫过程中析出的V(N，C)粒子可以促进针状铁素体形成，它们起到分割奥氏体晶粒、细化马氏体板条束的作用。含质量分数0.089%V-0.029%N的耐磨钢板的综合性能最好。

The effect of V-N microalloying on microstructure and properties of wear-resistant plate was investigated, with plain low alloy Cr-Mo-B composition and directly quenched (DQ) plus low-temperature tempered process. The results show that the plate without V-N microalloying was with lath martensite microstructure and had the impact energy of 15 J at-20℃and Brinell hardness of 443. Two kinds of V-N microalloying plates with addition of 0.088%V-0.013%N and 0.089%V-0.029%N respectively showed obviously refined lath martensite structure and existing of a small amount of acicular ferrite. Their impact energy at -20 ℃ increased to 30 and 42 J, respectively. Meanwhile, the plate with 0.089%V-0.029%N showed almost the same hardness as the plate without V-N had. During the low temperature deformation in austenite precipitation of fine V (C, N) particles formed could suppress austenite grain growth. The V(N, C) particles precipitated during finish rolling at 860℃and the subsequent relaxation process could promote the formation of acicular ferrites, which played a role in splitting austenite grains and in refinement of martensite microstructure. The plate containing 0.089%V-0.029%N showed the best comprehensive performance.