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为探讨以V代C的可能性及V、N对冷拉过程中渗碳体的影响规律,对传统70级帘线钢进行了V、N微合金化。测量了不同冷拉应变量试样的拉伸及扭转性能;用透射电镜及能谱仪(TEM+EDS)分析了V、N相的析出;通过振动样品磁强仪(VSM)测量饱和磁化强度,预测了渗碳体溶解变化规律。结果表明:加V导致冷拉试样抗拉强度总体上呈升高趋势,延伸率稍微降低,扭转次数降低。加N导致冷拉试样抗拉强度总体上先升高后降低,延伸率升高,扭转次数降低。V部分溶于铁素体,部分溶于渗碳体。N含量较低时,N固溶于铁素体;N含量增加到0.008 2%,开始有V析出相在铁素体中析出。随V、N的增加,冷拉过程渗碳体趋于稳定。(70级+0.086%V)可代替80级帘线钢。
In order to investigate the possibility of V generation C and the influence of V and N on the cementite during cold drawing, V and N microalloying of 70 grade cord steel was carried out. The tensile and torsional properties of specimens with different cold-drawn strain were measured. The precipitation of V and N phases was analyzed by TEM and EDS. The saturation magnetization , Predicted the variation of cementite dissolution. The results show that the tensile strength of cold drawn specimens increases with the increase of V, the elongation decreases slightly and the number of torsion decreases. The tensile strength of cold-drawn samples increases with N and increases first and then decreases, the elongation increases, and the number of torsion decreases. V part soluble in ferrite, partially soluble in cementite. When the content of N is low, N dissolves in the ferrite; when the content of N increases to 0.008 2%, the precipitation of V precipitates in the ferrite. With the increase of V and N, the cementite in the cold drawing process tends to be stable. (70 + 0.086% V) can replace 80 grade cord steel.