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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。
The effects of Nb on microstructure and mechanical properties of high strength wear resistant steel were studied by optical microscope, scanning electron microscopy, transmission electron microscopy and mechanical analysis. The strengthening and toughening mechanism of Nb containing wear resistant steel was also discussed. The results show that the mechanical properties of the experimental steel show good mechanical properties when tempered at 200 ℃ and the mechanical properties of the experimental steel decrease gradually with the increase of the tempering temperature. Adding a small amount of Nb, on the one hand, inhibited the grain growth during heating and on the other hand, precipitated precipitation of NbC inhibited the recrystallization and recrystallization of grains during the rolling process and retained larger dislocations Nb, Nb-containing steel exhibits superior mechanical properties under the combined action of fine grain strengthening, precipitation strengthening and dislocation strengthening, and Nb element can suppress the formation of cementite and prevent the largeness of toughness due to temper embrittlement decline.