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在碳很低的低碳钢中,为了运用带加速冷却的热机械加工(TMP),通过机械性能和显微组织,研究了复合添加硼和一种细化晶粒元素如Nb,Ti或V的作用。发现虽然单独加硼对钢的机械性能几乎没有影响。但复合添加Nb和B却改善了强度和韧性的匹配。钢中单独加入B,轧制后在奥氏体晶界上析出粗大的Fe_(23)(CB)_6,从而消耗了B,使其无法起到抑制γ-α转变的作用。铌加入B钢抑制了Fe_(23)(CB)_6的析出并大大地推迟γ-α转变,从而形成一种细晶粒贝氏体组织。Ti象Nb一样有类似的作用,但V没有这种作用。用复合添加Nb和B,通过合金元素对轧制期间奥氏体的最低再结晶温度的影响试验,还研究了钢的强化和韧化机制以及γ-α转变特性。
In low-carbon, low-carbon steels, in order to use thermo-mechanical processing (TMP) with accelerated cooling, mechanical properties and microstructures were studied for composite addition of boron and a refined grain element such as Nb, Ti or V Role. It was found that while adding boron alone had almost no effect on the mechanical properties of the steel. However, the compound addition of Nb and B improves the matching of strength and toughness. B was added into the steel to separate coarse Fe_ (23) (CB) _6 precipitated on the austenite grain boundaries after rolling, which resulted in the loss of B, which prevented it from inhibiting the γ-α transformation. The addition of niobium to B steel suppresses the precipitation of Fe_ (23) (CB) _6 and greatly delays the γ-α transformation, thus forming a fine-grained bainite structure. Ti has a similar effect as Nb, but V does not have this effect. The effects of alloying elements on the minimum recrystallization temperature of austenite during rolling were tested by compound addition of Nb and B, and the strengthening and toughening mechanisms and γ-α transformation properties of the steel were also studied.