共查询到20条相似文献,搜索用时 15 毫秒
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The temperature field of 50CrV4 automobile gear bar steel in continuous rolling is simulated by FEM. The temperature variations of the bar during continuous rolling are obtained. The cross-sectional temperature field for some passes has been solved simultaneously. It is clear that the surface temperature of a bar calculated by FEM accords well with the temperature found in practice. The simulated results in this paper describe the temperature pattern of rolling in great detail. Especially, this paper offers reference data for the TMCP treatment of bar steel. 相似文献
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通过开发用于组织模拟的用户程序,采用有限元软件DEFORM-3D模拟AM50镁合金多道次热轧过程中的组织转变,并通过与实验结果的对比分析证明该用户程序模拟多道次轧制的可行性。结果表明:多道次热轧有助于镁板的晶粒细化及均匀再结晶组织的获得,精轧前的板坯温度对终轧后的晶粒尺寸影响很大,但对晶粒尺寸的分布情况影响不明显。开发的用户程序亦可应用于其他类型多道次热变形过程的模拟研究。 相似文献
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Hongtao DingNinggang Shen Yung C. Shin 《Journal of Materials Processing Technology》2012,212(5):1003-1013
Recently, grain refinement and grain misorientation have been experimentally studied for various materials with ultra-fine grained microstructures, which are achieved by the multi-pass cold rolling process. In this paper, a numerical framework is developed to model the evolution of grain size and grain misorientation based on a dislocation density-based material model. Novel finite element models embedded with the dislocation density-based material subroutine are developed to model the plastic deformation and microstructural evolution during the multi-pass cold rolling process. The multi-pass cold rolling processes of commercially pure titanium (CP Ti) and aluminum (AA 1200) are simulated in order to assess the validity of the numerical solution through comparison with experiments. The dislocation density-based material models are developed for CP Ti and AA 1200, which reproduce the observed material constitutive mechanical behavior under various strains, strain rates and temperatures occurring in the cold rolling process. It is shown that the developed model captures the essential features of the material mechanical behaviors and predicts a minimum grain size of below 100 nm after five-pass cold rolling of CP Ti with equivalent strains up to 2.07 and the average incidental dislocation boundary (IDB) misorientation angle increased to 4.6° after six-pass cold rolling of AA 1200 with equivalent strains accumulated to 5.77. 相似文献
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轧制变形量对连续挤压纯铜板带组织性能的影响 总被引:3,自引:0,他引:3
针对连续挤压-冷轧铜板带工艺,分析14mm×290mm的纯铜板坯及其冷轧轧制变形量分别为70%、89%(含退火)共4种铜板的显微组织结构和力学性能。结果表明,挤出板坯的横纵截面组织均为均匀的等轴晶粒,并存在少量的孪晶。随着轧制变形量的增加,纵截面开始逐渐形成冷轧纤维流线,而横截面则形成变形织构,组织不均匀。当轧制变形量达到89%时,板的延伸率低于5%,不利于后续精轧。经退火后重新形成均匀细小的等轴晶粒,延伸率提高到50%以上。板的抗拉强度随变形量的增加而变大,塑性降低,铜板产生了各向异性。 相似文献
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Simulation of vertical-horizontal rolling process during width reduction by full three-dimensional rigid-plastic finite element method 总被引:12,自引:0,他引:12
S. Xiong X. Liu G. Wang W. Zhang 《Journal of Materials Engineering and Performance》1997,6(6):757-765
Vertical-horizontal (V-H) rolling is an important process during width reduction in the roughing stand of hot strip mill.
A simulation of steady-state V-H rolling was carried out by the full three-dimensional rigid-plastic finite element method
(3D RPFEM). To consider the shear work rate and cope with a singular point, an extremely thin array of elements was attached
before the entry of the roll. The slab shape, the spread, the separating force, and the rolling torque calculated were in
good agreement with the experimental values. 相似文献
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棒线材多道次轧制过程的静力隐式有限元模拟及模型优化 总被引:6,自引:2,他引:6
借助有限元分析软件MSC.Marc,采用三维热机耦合有限元模型和静力隐式算法,对多道次连轧稳态轧制过程进行模拟分析。模型中轧辊间距采用真实尺寸。基于静力隐式算法的特性,在优化模型中引入刚性推动体,实现模型的简化。比较优化前后两种有限元模型的模拟结果及参数,表明该文所建立的优化模型可以在保证较好的计算精度前提下,显著地提高运算效率。应用优化模型模拟粗轧六道次连轧过程,温度变化模拟结果与实际测量结果吻合较好。 相似文献