通过光学显微镜、扫描电子显微镜、透射电子显微镜以及力学分析等方法研究了Nb对高强耐磨钢组织和力学性能的影响,并讨论了含Nb耐磨钢的强韧化机理.结果表明,在200 ℃回火时,实验用钢展示了较好的力学性能;随着回火温度的提高,实验钢的力学性能逐渐下降.加入少量的Nb元素,一方面在加热过程中抑制了晶粒的长大,另一方面在轧制过程中形变诱导析出NbC析出抑制了晶粒的回复和再结晶,保留了较大的位错密度,在细晶强化、析出强化和位错强化的共同作用下,含Nb钢展示了更为优越的力学性能,并且Nb元素能够抑制渗碳体的形成,防止由于回火脆性造成韧性的大幅下降.
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