钒，氮含量对耐磨钢NM400组织及性能的影响

doi:10.13228/j.boyuan.issn0449-749x.20130721

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Abstract 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.

Received: 23 December 2013 Published: 13 October 2014

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TG142.1

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HU Xiao-Xuan. Influence of Vanadium and Nitrogen Content on Microstructure and Properties of NM400 Wear-Resistant Steel[J]. Iron and Steel, 2014, 49(10): 89-94.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20130721 OR http://www.chinamet.cn/Jweb_gt/EN/Y2014/V49/I10/89

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