共查询到18条相似文献,搜索用时 64 毫秒
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钒氮微合金化技术在HSLA钢中的应用 总被引:28,自引:1,他引:27
含钒钢中增氮,促进了碳氧化钒的析出,增强了钒的沉淀强化作用,大幅度提高钢的强度。因此,氮是含钒钢一种经济有效的合金化元素。通过充分利用廉价的氮元素,钒氮微合金化钢在保证相同的强度水平下,可节约钒的用量,降低钢的成本。V-N微合金化技术在高强度钢筋、结构钢板带及型钢、无缝钢管、非调质钢、高碳钢钱棒材以及高速工具钢等产品中获得了广泛应用。 相似文献
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介绍了济钢采用Nb Al或V Al微合金化及控轧技术进行高强度微合金化Q390Eq桥梁钢板的研制情况,并对Nb Al刘成V Al微合金化钢生产工艺及力学性能、焊接性能等进行了分析,摸索出了Q390Eq桥梁钢板的成分设计及控制轧制的工艺参数,对生产高强度、高韧性的微合金化钢板具有参考价值。 相似文献
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在Q460C中厚钢板生产中采用控轧控冷措施:依靠细化晶粒和析出强化,添加微量元素Nb,既保证了钢板的力学性能,又避免了成本的提高。 相似文献
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采用不同V系、V-Ti系微合金化成分设计的Q420C级电力角钢进行工业试制,并进行力学性能检验、金相分析、JMatPro以及电解化学相分析。结果表明,V-Ti微合金系,Ti元素全部析出,Ti先与N结合生成TiN,钢中剩余的N含量较少,降低了V的析出驱动力,导致V元素析出率较低,析出率仅约30%;Ti的加入改变了V的析出形式,部分V在TiN上形核长大,粗化了析出相尺寸,析出物尺寸大多大于20 nm,其析出物基本上不起析出强化作用,V-Ti系角钢的析出强化效果不及V系角钢。通过研究和构建角钢多元纳米相的层次化析出与竞争析出理论基础,为电力角钢成分设计及工艺控制提供理论依据。 相似文献
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为降低传统的Nb-V复合微合金化Q460建筑用钢板中的合金含量及生产成本,利用第3代TMCP技术和V-N微合金化技术,研制出单独V-N微合金化(wV=0.06%~0.08%)、不含铌的合金设计,并通过合理地控轧控冷工艺,在中厚板轧机上成功地生产出厚度40和50mm的V-N微合金化Q460GJC钢板。产品具有良好的综合性能,屈服强度大于470MPa,0℃冲击功超过150J,屈强比仅为80%。分析表明,细晶及析出强化对强度的贡献比例达到66%。 相似文献
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发展钒合金化的低合金高强度热轧钢权,符合我国的资源和人有良好的推广应用前景。合理进行万分微调和控制热轧工艺是提高钢板质量的重要措施。 相似文献
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采用热模拟及透射电子显微镜结合纳米束能谱技术,研究了Mn-Mo-Nb-B系多元微合金钢奥氏体变形后等温过程中(松弛)的析出行为。实验结果表明:经变形后,在850℃和900℃保温过程中,Mn-Mo-Nb-B多元微合金钢析出颗粒尺寸在各个阶段均小于相同工艺下Nb-Ti钢中析出相的尺寸。统计结果显示,析出颗粒的尺寸均复合正态分布,并且峰位尺寸接近平均尺寸。析出相中Nb/Ti比随着松弛时间而增大。松弛阶段后期,Mo进入(Ti,Nb)(C,N)的晶格当中,其含量随着时间的延长而增加。 相似文献
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In this paper, the kinetics of TiN, V(C,N)) and AlN precipitation in microalloyed steel during continuous casting is investigated experimentally and theoretically. The precipitate phase fraction, mean radius, number density and composition are simulated with the thermo‐kinetic software MatCalc and compared with experimental results obtained from transmission electron microscopy analysis. A new methodology for modelling precipitation in cast steel is proposed, which consists of two parts: First, a Scheil – Gulliver simulation, which is carried out to obtain information on the amount of microsegregation during solidification. Then, based on this information, two precipitation kinetics simulations are performed: One with the chemical composition representative for the solute‐poor core of the secondary dendrite arms, the other with the composition of the residual liquid at a fraction of 5%, corresponding to the segregated solute‐rich interdendritic regions. The results of the computer simulations using the new methodology are in good agreement with experimental observation. 相似文献
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The precipitation of niobium carbo‐nitrides in the austenite phase, interphase and ferrite phase of microalloyed steel was assessed by a critical literature review and a round table discussion. This work analyses the contribution of niobium carbide precipitates formed in ferrite in the precipitation hardening of commercially hot rolled strip. Thermodynamics and kinetics of niobium carbo‐nitride precipitation as well as the effect of deformation and temperature on the precipitation kinetics are discussed in various examples to determine the amount of niobium in solid solution that will be available for precipitation hardening after thermomechanical rolling in the austenite phase and successive phase transformation. 相似文献
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在实验室条件下,对一种微合金高强度钢进行热膨胀试验和热轧试验,测定了该试验钢的连续冷却转变动力学(CCT)曲线,并研究了不同温度转变的组织和第二相的体积分数、尺寸对其力学性能的影响。试验结果表明:变形温度的降低,贝氏体转变开始温度与转变结束温度均升高,硬度值也出现不同程度的提高;变形温度的降低,使得不同冷却速度下组织细化程度存在明显差异。利用合理控轧控冷工艺,使得屈服强度均达到690MPa以上,-30℃冲击功均达到230J以上。其中,第二相粒子在整个基体内呈细小弥散分布,起到有效的强化作用并改善钢的冲击韧性。 相似文献
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The precipitation kinetics in a low carbon high strength low alloy (HSLA) steel,microalloyed with V+Nb has been studied by using the stress relaxation method.This technique was carried out in a dynamic dilatometer and allows to determine the onset and finishing precipitation times in hot deformed austenite.The evolution of the precipitates was also observed using field emission scanning electron microscopy (FESEM) on samples quenched at different times at given temperatures.Discussion is completed with the predictions by the thermodynamic software FactSage to identify stable precipitate phases under equilibrium conditions.Results confirm the feasibility of the stress relaxation technique as an efficient method for investigating precipitation kinetics. 相似文献