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采用计算机对高速线材生产过程进行模拟,开发出具有较高准确度同时具有对不同轧制工艺有较好通用性的高线生产仿真系统。利用有限元方法计算了线材在待轧、轧制、水冷及风冷过程的温度场;通过对再结晶动力学模型的解析,得到了静态再结晶、动态再结晶的分数以及奥氏体晶粒在轧制过程中的变化情况;通过组织演变模型和温度模型的耦合计算,模拟出斯太尔摩风冷线上线材的组织变化过程;建立了利用初始化学成分和组织组成预测高线产品力学性能的BP神经网络模型,通过生产过程数据的训练,实现了对线材力学性能的预测。仿真计算的结果对线材控轧、控冷工艺的改进有一定的指导意义。 相似文献
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本文建立了C-Mn钢在控制轧制和控制冷却生产中微观组织演变和力学性能预测的物理冶金模型。模型包括加热、再结晶、相变和力学性能四部分,分别描述了中厚板热轧度冷却过程中的物理冶金现象。根据现场数据,计算了轧制过程奥氏体晶粒尺寸和再结晶分数的演变,预测了在不同工艺条件下连续冷却转变各相的体积分数和铁素体的晶粒尺寸等显微组织参数和相关的力学性能,预测结果和实测值吻合较好。 相似文献
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建立了C-Mn钢在控制轧制和控制冷却生产中微观组织演变和力学性能预测的物理冶金模型。模型包括加热、再结晶、相变和力学性能四部分,分别描述了中厚板热轧及冷却过程中的物理冶金现象。根据现场数据,计算了轧制过程奥氏体晶粒尺寸和再结晶分数的演变,预测了在不同工艺条件下连续冷却转变各相的体积分数和铁素体的晶粒尺寸等显微组织参数和相关的力学性能,预测结果和实测值吻合较好。 相似文献
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通过热连轧带钢温度场的有限元分析以及带钢热连轧过程的再结晶动力学和应变累积的研究,建立了精轧过程平均流变应力模型:静态再结晶平均流变应力σk=k1 exp{0.126-1.75[C] 0.594[C]^2 (2851 2968[C]-1120[C]^2)/T/ε^0.21ε^0.13,其中T-再结晶温度/K,ε-应变,ε-应变速率/s^-1,k1-系数;动态再结晶平均流变应力σD=9.8σB(1-Xdyn) 1.14σBB Xdyn,其中Xdyn-动态再结晶率,σBB-动态再结晶进入稳态时应力。X46级管线钢(%:0.07C-0.97Mn-0.33Si-0.018Nb)工业轧制时轧制压力的实测数据与该模型预测数据吻合良好。 相似文献
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��ǿ�������գ����Ҳ�����֣�ڣ����պ������� 《钢铁研究学报》2015,27(11):73-76
Billet with cross section of 350mm??2320mm was rolled to Q345E- Z35 with cross section of 100mm??2360mm. Different finishing rolling temperatures and re- reddening temperatures were tested with deformation higher than critical that of dynamic recrystallization and l/h??0. 53 during rough rolling. The results show that when finishing temperature of final finishing stage is about 780?? and re- reddening temperature is about 610??, the produced steel plate has excellent mechanical properties and lamellar tearing resistance. 相似文献
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A. Bodin J. Sietsman S. Van Der Zwaag 《Metallurgical and Materials Transactions A》2002,33(6):1589-1603
Laboratory rolling trials have been performed to investigate the development of microstructure and crystallographic texture
during and after intercritical rolling. The finishing temperature was varied over a wide range, and samples were taken just
prior to the last pass, after quenching following the last pass, after air cooling and coiling, and after accelerated cooling
and coiling. Cooling of the samples to the entry temperature for the last pass does not influence the texture of the sample,
nor do higher cooling rates after austenitic finishing within the range of cooling rates in this study, although it may cause
a refinement of the ferrite grains. Recrystallization after intercritical rolling leads to a decrease in texture intensity.
In the case of recrystallization of low-carbon steels, the nucleation mechanism is strain-induced boundary migration (SIBM),
which leads to unfavorable textures for deep drawing. In the case of recrystallization of interstitial-free (IF) steel after
ferritic rolling, the nucleation mechanism shifts from the SIBM mechanism at high finishing temperatures to subgrain coalescence
at (SGC) low finishing temperatures. The latter mechanism leads to more favorable textures for deep-drawing applications.
Transformation-induced (TI) nucleation explains the occurrence of a sudden increase in ferrite grain size after high-temperature
intercritical deformation of low-carbon (LC) steels. 相似文献
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轧制条件对冷轧无取向硅钢织构的影响 总被引:7,自引:4,他引:3
除钢质的纯净度、夹杂物聚集程度、再结晶组织外 ,织构分布和各组分强度对冷轧无取向硅钢的磁性能 磁感应强度和铁损亦具有显著的影响。从基础理论方面讨论了冷轧无取向硅钢的热轧、终轧温度和层流冷却条件对轧件织构形成的影响及冷轧压下率和冷轧轧制形状参数对其再结晶织构的影响. 相似文献
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The control of the amount of solute carbon in ultra low carbon Ti IF steels during ferrite rolling and subsequent recrystallization is of prime importance for the development of an appropriate recrystallization texture and for the production of thin deep drawable hot strips. In the present work, the effect of the solute carbon content and the rolling conditions on the recrystallization texture after ferrite rolling and on the corresponding Lankford value was quantified. Therefore, ultra low carbon Ti IF steels with different sulphur and titanium contents were rolled in the ferrite region, in order to obtain a variation in solute carbon content (from 0 to about 10 ppm) at the ferritic rolling temperatures. It was shown that a deep drawing grade (rmean> 1.4) can be obtained if the chemical composition of the steel guarantees a complete stabilisation of the solute carbon in the austenitic temperature region and if sufficient strain (85%) is given in the finishing train at temperatures lower than about 800°C. It can be concluded that the sulphur and titanium contents have to be chosen slightly higher in comparison to the conventional Ti IF steel grades used for cold rolling and annealing. 相似文献
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采用数值分析、有限元分析、实验室试验等方法研究了高速线材精轧变形宽展影响因素及宽展模型、模块化精轧机耦合刚度及刚度模型、高速轧制时咬钢速降控制策略。针对某不锈钢高速线材生产线精轧机组长期存在的稳定性差、收放料型不准确导致的产品尺寸精度波动大的问题进行升级改造,通过高适应性孔型系统、高刚度模块化高速轧机、高速轧制速降控制技术实现了模块化精轧技术在不锈钢高线中的应用。针对爬坡段易划伤问题,将滑动摩擦式爬坡导槽优化为滚动摩擦式三辊导槽,并将精轧前侧活套调整为立活套。改造后生产结果表明,模块精轧机运行稳定,锥箱振动值小于2.8 mm/s,精轧机组出口料型尺寸精度较改造前提高20%以上,最终产品尺寸精度及表面质量均得到了明显改善。 相似文献
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