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以双辊薄带连续铸轧工艺凝固过程为基础,基于金属凝固的基本原理,并运用现代计算机仿真技术建立了双辊薄带连铸凝固过程的异质形核、修正的枝晶尖端生长动力学、柱状晶向等轴晶生长转变(CET)的解析模型以及基于元胞自动机(CA)的双辊薄带连续铸轧凝固组织的仿真模型,为双辊薄带连续铸轧凝固组织形成的仿真模拟奠定了基础,同时利用铝合金双辊薄带连续铸轧组织凝固过程验证了数学模拟的可行性。结果表明:可用建立的数学模型模拟预测铸轧工艺参数对双辊连续铸轧薄带凝固组织的影响。 相似文献
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利用自行开发的镁合金双辊铸轧设备,通过镁合金铸轧工艺试验,制备出AZ31镁合金铸轧板坯。研究了双辊铸轧镁合金板坯显微组织特征及铸轧温度对板坯微观组织影响规律。结果表明,镁合金双辊铸轧板坯晶粒细小,均匀圆整,显微组织具有快速凝固和半固态组织特征;铸轧温度对板坯显微组织的影响显著,当铸轧温度为685℃时,镁合金铸轧板坯获得理想的显微组织。 相似文献
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立式双辊铸轧镁合金薄带微观组织分析 总被引:1,自引:0,他引:1
在实验室的立式双辊铸机上进行了AZ31B镁合金薄带的铸轧试验.研究了不同工艺下铸轧薄带微观组织,并对不同冷却方式下铸轧镁合金薄带微观组织进行了分析.结果表明,双辊铸轧镁合金晶粒细小、无共析现象发生.铸轧速度对板带的显微组织影响显著,当铸轧速度达到20 m/min时,镁合金薄带组织为理想等轴晶.对铸轧态镁合金薄带进行油冷,既防止了薄带表面氧化,又阻止了冷却过程晶粒长大. 相似文献
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在研究双辊连铸铝合金薄带工艺凝固过程的基础上,基于金属凝固的基本原理,建立双辊连铸铝合金薄带凝固的异质形核、枝晶尖端的生长动力学(KGT)、柱状晶向等轴晶生长的转变(CET)的解析模型,同时建立基于元胞自动机(CA)的双辊连铸铝合金薄带凝固组织的仿真模型,为双辊连铸薄带凝固组织形成的仿真模拟奠定基础,从而为双辊薄带连铸工艺提供一定的理论指导。同时利用铝合金双辊薄带连续铸轧组织凝固过程验证了数学模拟的可行性。 相似文献
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近终形双辊铸轧镁合金薄带是目前国内外研究的热点之一,本文中以AS系镁合金为研究对象,利用双辊铸轧法成功铸轧出了厚度5mm的AS系镁合金板材,并研究了镁合金铸轧薄带组织和后续热轧工艺对镁合金板材组织性能的影响。研究表明,As系镁合金铸轧薄带组织均匀,铸轧的亚共晶组织(Mg.3%A1-0.75%Si)主要由细小的蔷薇状枝晶组成;而铸轧的共晶与过共晶组织(Mg-5.52%A1-1.4%Si和Mg-6%A1-1.6%Si)主要由蔷薇状枝晶和等轴晶组成。热轧后,再结晶程度、晶粒细化效果和抗拉强度随压下量的增加而提高。 相似文献
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在研究双辊连铸纯铝薄带凝固过程的基础上,基于金属凝固的基本原理,并运用现代计算机仿真技术建立双辊连续铸轧纯铝薄带凝固的异质形核,枝晶尖端的生长动力学(KGT),柱状晶向等轴晶生长的转变(CET)的解析模型;建立基于元胞自动机(CA)的双辊连铸纯铝薄带凝固组织的仿真模型,为双辊连铸薄带凝固组织的仿真模拟奠定基础,从而为双辊薄带连铸工艺提供一定的理论指导。同时,利用双辊薄带连续铸轧纯铝凝固微观组织过程验证数学模拟的可行性。 相似文献
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Microstructural evolution and mechanical properties of twin roll cast (TRC) Mg-3.3 wt.%Al-0.8 wt.%Mn-0.2 wt.%Ca (AM31 + 0.2Ca) alloy strip during warm rolling and subsequent annealing were investigated in this paper. The as-TRC alloy strip shows columnar dendrites in surface and equiaxed dendrites in center regions, as well as finely dispersed primary Al8Mn5 particles on interdendritic boundaries which result in the beneficial effect on microstructural refinement of strip casting. The warm rolled sheets show intensively deformed band or shear band structures, as well as finely and homogeneously dispersed Al-Mn particles. No evident dynamic recrystallization (DRX) takes place during warm rolling process, which is more likely attributed to the finely dispersed particle and high solid solution of Al and Mn atoms in α-Mg matrix. After annealing at 350 °C for 1 h, the warm rolled TRC sheets show fine equiaxed grains around 7.8 μm in average size. It has been shown that the present TRC alloy sheet has superior tensile strength and comparative elongation compared to commercial ingot cast (IC) one, suggesting the possibility of the development of wrought magnesium alloy sheets by twin roll strip casting processing. The microstructural evolution during warm rolling and subsequent annealing as well as the resulting tensile properties were analyzed and discussed. 相似文献
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1 INTRODUCTIONThedevelopmentofmodernmaterialprocessingscienceandtechnologyhasdriventhetransnormaloutfieldsmaterialprocessingtechnologytobeafavor abledevelopingandresearchdirectionoftwinrollcastingprocess[1,2 ] .Asweallknow ,theconven tionaltwinroll casting (CTRC)hasthefollowingdisadvantages :lowrollcastingspeed ;fewkindsofa luminumalloyswhichcouldbeproduced ;segregationandinhomogeneityexistingbothonthesurfaceandinsideofCTRCstrips ,andhardto producehighqualitystripsforhighgradeperforman… 相似文献
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铝带坯铸轧过程轧制压力的建模与仿真研究 总被引:3,自引:0,他引:3
利用切块法分别推导出铸轧过程上述两区的静力平衡微分议程,在所建立的轧制压力模型的基础上,对常规铸轧进行了仿真计算,计算结果与实测数据相吻合,在此基础上,对快速铸轧进行了虚拟仿真研究,研究结果表明,减薄铸轧板坯厚度可提高铸轧速度;随着铸轧速度降低,铸轧区增大与铸轧坯厚度减薄,轧制压力峰值增大,随着铸轧辊径增大,轧制压力增大,因此铸轧机力能的设计参数也要相应增大。 相似文献
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M. J. Bagshaw J. D. Hunt R. M. Jordan 《International Journal of Cast Metals Research》2013,26(1):16-23
The authors show that a steady state two-dimensional finite difference model has been developed to describe the roll casting process, incorporating a variable heat transfer coefficient through the roll bite. The model explains the formation of the speed limiting defects called ‘heat lines’ in terms of this variable strip/roll heat transfer coefficient. The results of subsequent casting speed trials are compared with the predictions made by the numerical model. Approximate values of the heat-transfer coefficients through the roll bite in the various regions proposed for the roll caster model have been determined by matching predicted strip exit temperatures to experimental measurements for various casting speeds. Further evidence for the values of the alloy/mould heat transfer coefficients were obtained from cooling curves. The model has been used to investigate the effect of varying various casting parameters on the strip exit temperature and the critical casting speed above which heat lines form. 相似文献
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SIMULATION OF THE TWIN ROLL STAINLESS STRIP CASTING PROCESS 总被引:3,自引:0,他引:3
1. IntroductionTwin roll stainless strip casting' process which can directly cast a thin strip with thickness less than 10mm from a molten metal pool is being researched by industrious workersall over the world. Compared with the conventional continuous casting, this process caneliminate the expansive and complex hot-rolling facilities, and can reduce both the capitalinvestmellt and the cost of production. Among various processes under development, thetwin-roll strip casting is revealed as the… 相似文献