共查询到19条相似文献,搜索用时 62 毫秒
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分析了型钢厂试制热轧美标H型钢低温冲击韧性偏低的原因,并在此基础上提出了对生产工艺的优化与改进。 相似文献
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针对厚重热轧H型钢压缩比受限而难以通过“应变诱发相变”机制细化组织的技术难题,提出了利用超细奥氏体晶界促进相变而实现组织细化的新技术。理论分析表明,由于厚重热轧H型钢的压缩比不足以达到“应变诱发相变”所要求的应变积累,如何利用粗轧过程中稳定的第二相粒子抑制奥氏体晶粒长大,并调控精轧过程中奥氏体动态再结晶发生的临界应变,是厚重热轧H型钢微合金化设计中需重点考虑的问题之一。试验结果表明,采用Ti/N微合金化设计可有效抑制加热和粗轧过程中奥氏体晶粒长大,进而达到调控精轧过程奥氏体动态再结晶临界应变、促进有限应变量下的奥氏体动态再结晶而实现组织细化的目的。同时,Ti/N微合金化设计为NbC粒子依附TiN粒子的形核析出提供条件,形成了更为细小和弥散分布的第二相粒子,有利于抑制道次间奥氏体的静态再结晶并有效提升热轧厚重H型钢的强韧性。 相似文献
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针对日型钢轧后冷却过程中存在着翼缘强度性能不足、残余应力分布不均等质量问题,设计并建成了H型钢控制冷却试验装置,进行控制冷却试验研究,取得了一定的研究成果,为H型钢在线控制冷却装置的建设做好了必要的技术准备。 相似文献
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本文比较全面地阐述了在350mm三机架可逆万能实验轧机上开展H型钢轧制技术研究的有关工艺技术问题,如万能粗轧机、轧边机、万能精轧机的轧辊孔型设计;按欧洲万能钢梁标准轧制H80×46mm型钢的轧制规程及轧制的H型钢样品尺寸精度;轧机调整;H形轧件在万能孔型中轧制时腿部宽展的变形研究,并给出了计算腿部宽展的公式;测定并分析了在万能孔型中轧制时的力能参数。 相似文献
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控轧技术在H型钢生产中的应用 总被引:2,自引:0,他引:2
根据钢板的控轧经验,结合H型钢轧制的特点分析控轧在轧制中运用的具体问题,制定H型钢控轧工艺方案。介绍了实际应用情况,并提出改进的措施。 相似文献
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《钢铁研究学报(英文版)》2016,(10):1012-1019
The microstructure models were integrated into finite element (FE)code,and a three-dimensional (3D) FE analysis on the entire hot forging processes of 300M steel large components was performed to predict the distri-butions of effective strain,temperature field and austenite grain size.The simulated results show that the finest grains distribute in the maximum effective strain region because large strain induces the occurrence of dynamic re-crystallization.However,coarse macro-grains appear in the minimum effective strain region.Then,300M steel forg-ing test was performed to validate the results of FE simulation,and microstructure observations and quantitative analysis were implemented.The average relative difference between the calculated and experimental austenite grain size is 7.5 6%,implying that the present microstructure models are reasonable and can be used to analyze the hot forging processes of 300M steel. 相似文献
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Thin slab casting and direct rolling technologies became important for hot strip production to increase the productivity, to lower the investment costs and to increase the energy efficiency. The main objective of our investigation is to gain a better understanding of the microstructural evolution starting from solidification through to the final hot rolled sheet. Small ingots were cast and direct rolled and reheated and rolled, using a thermomechanical testing machine. The differences in the recrystallization kinetics during both production routes were measured using double hit hot compression tests. In addition, multipass deformation trials were performed to reveal differences in the resulting microstructure and the grain size homogeneity. It was found, that the coarse initial microstructure before rolling become negligible after three rolling passes. This means that despite the simple and economical direct rolling similar mechanical strip properties can be obtained in comparison to conventional strip production routes. 相似文献
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Numerical Simulation of Austenite Recrystallization in CSP Hot Rolled C-Mn Steel Strip 总被引:2,自引:0,他引:2
TANG Guang-bo LIU Zheng-dong DONG Han GAN Yong KANG Yong-lin LI Lie-jun MAO Xin-ping 《钢铁研究学报(英文版)》2007,14(4):49-55,60
An integrated mathematical model is developed to predict the microstructure evolution of C-Mn steel during multipass hot rolling on the CSP production line,and the thermal evolution,the temperature distribution,the deformation,and the austenite recrystallization are simulated.The characteristics of austenite recrystallization of hot rolled C-Mn steel in the CSP process are also discussed.The simulation of the microstructure evolution of C-Mn steel ZJ510L during CSP multipass hot rolling indicates that dynamic recrystallization and metadynamic recrystallization may easily occur in the first few passes,where nonuniform recrystallization and inhomogeneous grain size microstructure may readily occur;during the last few passes,static recrystallization may occur dominantly,and the microstructure will become more homogeneous and partial recrystallization may occur at relatively low temperature. 相似文献
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板带轧制数学模型是实现自动控制的基础,高精度的数学模型是提升产品质量和市场竞争力的重要保障。在热连轧粗轧过程控制中,轧制力和宽展是关键参数,其模型精度不仅会影响粗轧轧制规程的设定,而且会影响最终热连轧带钢产品凸度。以矩形板坯热连轧粗轧过程为研究对象,针对轧制变形区建立了三维运动许可加权速度场,在此基础上充分考虑自然宽展效应,基于刚塑性材料的第一变分原理,采用可变上限积分法对塑性变形、剪切功率和摩擦功率进行积分获得变形区总功率泛函。利用Matlab优化工具箱对总功率泛函进行最小化,得到了轧制力、宽度分布的理论解。最后利用理论模型计算数据回归得到了板坯宽展及速度场中的加权系数模型。将基于所提出模型的轧制力和宽展预测值与现场实测值及部分有关学者所建立模型的预测值进行了对比,结果验证了所建立模型的准确性。研究得到的宽展模型和速度场加权系数表达式可以方便、灵活、快速地应用到粗轧现场中,为更高质量热连轧带钢产品的生产奠定了坚实基础。 相似文献
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