Effect of deformation temperature and cooling rate on microstructure and properties of microalloyed 82B wire rod
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摘要: 利用热模拟仪、金相显微镜、万能试验机等手段对微合金化82B盘条的变形温度及冷却速度进行了研究分析，试验结果表明：较快的冷速会促进钒合金化试样中含钒第二相的析出，提高材料强度的同时降低其塑性，该合金化方式需控制钒含量；钒氮合金化是一种适合82B盘条的强化方式，但材料的钒和氮含量比例关系，以及与冷速的交互作用可显著影响材料的强韧性，需严格控制钢中钒氮配比；铬钒复合微合金化可显著提高82B盘条的强度和韧性，且不受冷速的强烈影响，是理想的微合金化方式，铬钒复合微合金化82B盘条组织均匀，未出现中心元素偏析，适宜终轧温度范围为900～940 ℃。Abstract: The deformation temperature and cooling rate of microalloyed 82B wire rod were studied by means of thermal simulator, metallographic microscope and universal testing machine in this paper. Experiment results show that the rapid cooling rate can promote the precipitation of the second phase containing vanadium in the vanadium alloyed sample, improving the strength of the material and reducing its plasticity, thus the vanadium should be well controlled for this alloying design. V-N alloying was suitable for 82B wire rod, but the ratio of V to N and the interaction with cooling rate could significantly affect the strength and toughness of the material, so it was necessary to control the ratio of V to N in the steel. Cr-V composite microalloying could significantly improve the strength and toughness of 82B wire rod, whichwas not strongly affected by the cooling rate, so it was an ideal microalloying method. The microstructure of 82B wire rod was uniform without element center segregation, and the suitable finishing temperature range was 900 ~ 940 ℃ for experimental steels.
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Key words:
- 82B wire rod /
- deformation temperature /
- cooling rate /
- microalloying /
- mechanical properties
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图 2 冷速对钒微合金化82B钢抗拉强度Rm和断面收缩率Z的影响
Figure 2. Effect of cold speed on tensile strength Rm and area reduction Z of vanadium microalloyed 82B steel
图 3 冷速对钒氮微合金化82B钢抗拉强度Rm和断面收缩率Z的影响
Figure 3. Effect of cold speed on tensile strength Rm and area reduction Z of vanadium nitrogen microalloyed 82B steel
图 4 冷速对含铬82B钢抗拉强度Rm和断面收缩率Z的影响
Figure 4. Influence of cooling rate on tensile strength Rm and area reduction Z of chromium containing 82B steel
图 5 变形温度对钒氮微合金化8#试样拉伸性能的影响
Figure 5. The effect of deformation temperature on the tensile properties of vanadium and nitrogen microalloyed 8# samples
图 6 8#试样经冷速1 ℃/s热模拟后的金相组织
Figure 6. Metallographic structure of 8# specimen after thermal simulation at 1 ℃/s
图 7 微合金化82B热模拟920 ℃变形后以1 ℃/s冷却后的拉伸性能
Figure 7. Tensile properties of microalloyed 82B thermal simulation at 920 ℃after cooling at 1 ℃/s
图 8 微合金化82B钢以1.0 ℃/s冷却后的金相组织
Figure 8. Microstructure of microalloyed 82B steel after cooling at 1.0 ℃/s
表 1 试验钢的主要化学成分
Table 1. Main chemical compositions of steelis
% 序号 C Mn Si V N Cr 备注 1# 0.80 0.75 0.22 0.0074 0.0025 82B 2# 0.83 0.73 0.26 0.044 0.0028 82B+0.044V 3# 0.82 0.74 0.22 0.079 0.0026 82B+0.079V 4# 0.81 0.74 0.28 0.14 0.0022 82B+0.14V 5# 0.83 0.74 0.26 0.096 0.009 82B+0.096V、0.009N 6# 0.83 0.74 0.26 0.095 0.013 82B+0.095V、0.013N 7# 0.81 0.74 0.24 0.014 0.18 82B+0.18Cr 8# 0.83 0.72 0.20 0.075 0.0037 0.19 82B+0.075V、0.19Cr 
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表 2 微合金化82B钢热模拟变形断口硬度
Table 2. Surface hardness of thermal simulated deformation fracture of microalloyed 82B steel
变形温度/℃ 硬度（HRC） 测量值 平均值 820 37.2, 37.9, 37.6, 37.3 37.5 840 37.5, 36.9, 38.3, 38.1 37.7 860 37.1, 37.6, 37.1, 38.5 37.6 880 37.1, 37.4, 37.9, 36.8 37.3 900 35.8, 36.9, 37.3, 35.3 36.3 920 35.7, 36.6, 37.2, 36.6 36.5 940 36.9, 36.3, 36.6, 36.9 36.7
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