共查询到12条相似文献,搜索用时 62 毫秒
1.
双辊薄带连铸侧封板热应力模拟及试验研究 总被引:1,自引:0,他引:1
采用有限元法模拟了双辊薄带连铸带钢工艺中侧封板的三维温度场和热应力.通过对侧封板的温度和应力的耦合数据模拟,得到在薄带连铸过程中侧封板的温度和应力分布规律,结合试验分析了造成侧封板破损的主要原因. 相似文献
2.
双辊薄带连铸浇铸过程中,熔池内钢液的分布以及熔池液面的波动是影响带钢质量的重要因素之一.布流器对实现稳定的薄带连铸过程和提高薄带质量具有重要的作用.针对实验所采用的布流器内部钢液的流动情况进行了计算,并与实际实验情况相对比,通过分析为优选出满足双辊薄带连铸要求的布流器提供依据. 相似文献
3.
薄带生产过程中,熔池内钢液的分布以及熔池液面的波动是影响带钢质量的重要因素.分配器对实现稳定的薄带连铸过程和保证薄带的质量具有重要的作用.针对所设计的不同结构的分配器,进行了流场、压力场计算,并对其进行分析,为优选出满足双辊薄带连铸要求的分配器提供依据. 相似文献
4.
针对板坯连铸过程,建立了钢液流动、传热、凝固的三维耦合数值计算程序,计算、分析了该过程钢液的流动、凝固特征,以及在浸入式水口区域和结晶器边部等局部区域钢液的流动、温度分布特点.计算结果表明,从浸入式水口出口注入的钢液,在流动的区域内形成2个空同分布的大循环区域,这两个循环区域中心的温度相对较低.上循环流在结晶器窄边附件由于拉坯的作用形成了小的狭长循环,同时有倒钩状温度分布情况.结晶器表面钢液的流动速度、湍动能分布大小以及F数,在一定程度上可以表征结晶器液面波高以及与铸坯质量的关系. 相似文献
5.
采用商业软件Fluent,针对宝?#连铸机结晶器的结构和工艺参数,进行了流动过程的三维数值模拟,分析了浸入式水口的浸入深度、水口侧孔倾角和拉速对结晶器内钢液流动的影响.结果表明,合适的浸入深度、水口侧孔倾角和拉速有利于夹杂物的上浮,减小液面波动. 相似文献
6.
Numerical and physical simulation of a twin-roll strip caster 总被引:6,自引:0,他引:6
Bo Wang Jieyu Zhang Yin Zhang Youduo He Junfei Fan Yuan Fang Shengli An 《北京科技大学学报(英文版)》2006,13(5):393-400
The 1:1 water model of a twin-roll strip caster was set up based on the Froude number and the Reynolds number similarity criteria. A new type metal delivery system was designed for the twin-roll strip caster. The level fluctuation and the fluid flow in the pool of the water model were measured using the level detector and the 3D-LDV (laser Doppler velocimetry) technology. It is shown that a wedged delivery system can produce the desirable level fluctuation and even fluid flow distribution in the pool Numerical simulations for the water model were performed. Comparisons between the numerical and physical simulation results show good agreement near the side dams. 相似文献
7.
The shape, type, content, and dimension of nonmetallic inclusions in SUS304 strip produced by twin-roll strip casting were studied using scanning electron microscopy (SEM). The results show that the inclusions are mainly spherical Al2O3 and complex oxides composed of MnO, Al2O3 , and SiO2. The percentage of fine oxides smaller than 3 μm reaches up to 51.8%. The theoretical calculations show that fine oxides have precipitated during solidification. Therefore, it is concluded that during twin-roll strip casting, because of high cooling rate, the size of inclusions precipitated during solidification decreases, and the amount increases. 相似文献
8.
Microstructure analysis of AISI 304 stainless steel produced by twin-roll thin strip casting process 总被引:2,自引:0,他引:2
Zhenmin Wang Yuan Fang Junjie Qi Yue Zhang Yan Yu Jianchun Wu 《北京科技大学学报(英文版)》2007,14(5):420-424
The microstructure of AISI 304 austenite stainless steel fabricated by the thin strip casting process were investigated using optical microscope, scanning electron microscope (SEM), transmission electron microscope (TEM), and X-ray diffraction (XRD). The microstructures of the casting strips show a duplex structure consisting of delta ferrite and austenite. The volume fraction of the delta ferrite is about 9.74vol% at the center and 6.77vol% at the surface of the casting thin strip, in vermicular and band shapes. On account of rapid cooling and solidification in the continuous casting process, many kinds of inclusions and precipitates have been found. Most of the inclusions and precipitates are spherical complex compounds consisting of oxides, such as, SiO2, MnO, Al2O3, Cr2O3, and FeO or their multiplicity oxides of MnO·Al2O3, 2FeO·SiO2, and 2MnO·SiO2. Many defects including dislocations and stacking faults have also formed during the rapid cooling and solidification process, which is helpful to improve the mechanical properties of the casting strips. 相似文献
9.
Numerical simulation of the temperature fields of stainless steel with different roller parameters during twin-roll strip casting 总被引:5,自引:0,他引:5
Yuan Fang) Zhen-min Wang) Qing-xiang Yang ) Yun-kun Zhang) Li-gang Liu) Hong-yan Hu) Yue Zhang) ) School of Materials Science Engineering University of Science Technology Beijing Beijing China ) Key Laboratory of Metastable Materials Science & Technology College of Materials Science Engineering Yanshan University Qinhuangdao China 《北京科技大学学报(英文版)》2009,16(3):304-308
The temperature field of stainless steel during twin-roll strip casting was simulated by experiment and a finite element (FE) model. By comparing the measured result with the simulated values, it is found that they fit close to each other, which indicates this FE model is effective. Based on this model, the effects of roll gap (0 and roll radius (R) on solidification were simulated. The simu-lated results give the relationship between t or R and the position of the freezing point. The larger the t is and the smaller the R is, the closer the position of the freezing point is to the exit. 相似文献
10.
采用金相显微镜和扫描电子显微镜(SEM)对双辊铸轧304不锈钢薄带裂纹及组织特征进行了观察,并结合能谱仪(EDS)对微区成分和夹杂物进行了分析。结果表明,铸轧薄带上的裂纹在薄带表面凹痕处产生,并沿柱状晶晶界向内部扩展,终止于柱状晶与心部等轴晶交界处;在柱状晶区内存大量缩孔和夹杂,在铸轧机械应力和热应力的共同作用下,破坏了材料的连续性;铸轧裂纹断面存在氧化现象,说明铸轧裂纹在铸轧凝固的高温阶段生成。 相似文献
11.
以Q345D大方坯为研究对象,采用二维传热模型对铸坯进行温度场计算.计算了不同拉速、过热度和二冷水量下铸坯温度分布和坯壳生长情况,分析了拉速、过热度和水量对铸坯的温度分布和坯壳生长的影响.得到了不同工艺下,铸坯温度分布规律和凝固坯壳生长规律,为实际生产提供一定的指导. 相似文献
12.
结合某钢厂的连铸机生产实践,建立宽厚板坯连铸传热数学模型,利用商业软件ANSYS,通过改变拉速,过热度,二冷水量等条件,对Q345C厚板坯的凝固过程进行数值模拟,分析了不同因素对连铸凝固传热过程的影响. 相似文献