Effect of different vanadium and nitrogen contents on microstructure and properties of Nb-V microalloyed high-strength seismic reinforcement
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摘要: 钒和氮可有效提高Nb-V微合金化高强抗震钢筋的综合性能。采用金相显微镜、扫描电镜、透射电镜、力学试验机等对三种不同钒、氮含量的Nb-V微合金化高强抗震钢筋的显微组织进行表征和测试。结果表明，三种试验钢的最终显微组织均为铁素体+珠光体+少量贝氏体。随着试验钢中钒、氮含量增加，其铁素体晶粒尺寸减小，珠光体片层间距逐渐细化。析出相NbV（C，N）随钒、氮含量的增加，沉淀析出的第二相颗粒体积分数增大，颗粒尺寸减小。试验钢断口形貌均为韧窝断裂，随着钒、氮含量增加，其韧窝加深，口径变大。在力学性能方面，抗拉强度逐渐升高，屈服强度和硬度略微下降而后增强。Abstract: Vanadium and nitrogen can effectively improve the comprehensive performance of Nb-V microalloyed high strength seismic reinforcement. The microstructure of three kinds of Nb-V microalloyed high-strength seismic reinforcement bars with different vanadium and nitrogen contents was characterized and tested by metallographic microscope, scanning electron microscope, transmission electron microscope and mechanical testing machine. The results show that the final microstructure of the three test steels is composed of ferrite, pearlite and small amount of bainite. As vanadium and nitrogen contents in test steel increases, the ferrite grain size is reduced, pearlite lamellar spacing is gradually thinning. With the increase of vanadium and nitrogen contents in precipitated phase NbV (C, N), the volume fraction of precipitated second phase particles increases and the particle size decreases. The fracture morphology of the tested steels is dimple fracture, and the dimple deepens and the diameter increases with the increase of vanadium and nitrogen contents. In terms of mechanical properties, tensile strength increases, yield strength and hardness slightly decrease and then increases.
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图 1 三种钢筋不同区域的金相组织
F-铁素体； P-珠光体； B-贝氏体(a)1#心部；(b)2#心部；(c)3#心部；(d)1#边部；(e)2#边部；(f)3#边部
Figure 1. Metallographic structure of different areas of three kinds of reinforcement
图 3 三种试验钢不同组织心部、边部占比
Figure 3. The proportion of core and edge of different tissues of three test steels
图 4 三种钢筋不同区域的SEM形貌
(a)1#心部；(b)2#心部；(c)3#心部；(d)1#边部；(e)2#边部；(f)3#边部
Figure 4. SEM morphology of different areas of three kinds of reinforcement
图 5 三种钢筋的析出相形貌
(a)1#心部；(b)2#心部；(c)3#心部
Figure 5. Microstructure of precipitated phase of three kinds of reinforcement
图 6 试验钢析出相的形貌及能谱分析
(a)析出相形貌；(b)析出相能谱
Figure 6. Morphology and energy spectrum of precipitation phase in test steel
图 7 三种试验钢分布的 TEM 暗场像
(a)1#心部；(b)2#心部；(c)3#心部
Figure 7. TEM dark field image of three kinds of test steels
图 9 三种试验钢拉伸断口形貌
(a)1#心部；(b)2#心部；(c)3#心部；(d)1#边部；(e)2#边部；(f)3#边部
Figure 9. Tensile fracture morphology of three test steels
图 10 三种试验钢强化机制计算结果
Figure 10. Calculation results of strengthening mechanism of three test steels
表 1 三种试验钢的主要化学成分
Table 1. Main chemical composition of three experimental steels
% 编号 C Si Mn P S V Nb N 1# 0.23 0.49 1.44 0.028 0.018 0.066 0.012 0.0169 2# 0.23 0.53 1.50 0.022 0.020 0.078 0.012 0.0186 3# 0.26 0.72 1.52 0.021 0.006 0.149 0.012 0.0223 
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表 2 三种试验钢的力学性能
Table 2. Mechanical properties of three experimental steels
编号 Rm/MPa ReL/MPa Rm/ReL A/% Agt/% 心部硬度（HV） 1# 725 570 1.27 21.53 16.40 285 2# 770 565 1.36 21.63 12.50 282 3# 825 650 1.27 25.16 14.20 286
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