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coatings at Qingdao test station(Ⅰ)-Immersion zone LI Yan1, XING Shao-hua1, LI Xin2, WEI Xu-jun2 (1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; 2. School... to immersion zone of Qingdao site was investigated with seawater corrosion test, microscopy morphology analyses and electrochemical measurements. The inferior performance of GI mainly results from its largest......
:A 文章编号:1672-7207(2012)08-3133-09 Strike slip fault zone characteristics of northwestern margin and geology meaning for oil-gas in Moliqing Fault... and rules of oil and gas accumulation in Moliqing Fault Depression were analyzed. Then the evolution characteristics and meanings for oil and gas exploration of strike slip fault zone in the northwestern......
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连铸二冷区铸坯展宽现象的黏弹塑性分析付建勋1,2,李京社1,张慧1(1.北京市北京科技大学 冶金与生态工程学院2.北京市钢研集团连铸技术国家工程研究中心)摘 要:通过在商业软件MSC.Marc基础上二次开发,建立了黏弹塑性三维热-力耦合有限元模型,模拟铸坯在二冷区的展宽状况.结果显示:铸坯的展宽主要产生于二冷区的前段,在前6个扇形段,铸坯的目标展宽率有逐渐增加的趋势;铸坯的展宽与厚度方向上的鼓肚密切相关;数值模拟使用的黏弹塑模型揭示铸坯展宽规律与铸坯实际变形相符,铸坯展宽是坯壳在钢液芯静压力作用下发生黏弹塑变形......
高炉块状带焦炭反应性的研究孔德文1,张建良1,龚必侠2,林祥海1,郭豪1(1.北京市北京科技大学 冶金与生态工程学院2.中冶京城工程技术有限公司,北京 100176)摘 要:研究了高炉块状带内焦炭的碳素损失情况及焦炭反应性的变化情况.结果表明,在高炉块状带内,焦炭的碳素损失从上到下呈增加的趋势,但增加不超过10%;在高炉炉身上部及中部,焦炭反应性指数变化不大,但是从炉身下部开始明显增加,至炉腹部位,焦炭反应性指数高达60.75%,几乎是入炉焦的3倍;焦粉热重反应性指数与块焦焦炭反应性指数有很好的对应关系,二者变......
下部调剂对高炉炉料运动影响的离散模拟张建良1,范正赟1,陈永星1,杨广庆1,杨天钧1,有山达郎2(1.北京市北京科技大学 冶金与生态工程学院2.东北大学 多元物质科学研究所,仙台 980-8577,日本)摘 要:应用三维离散元法对4 000m3高炉内的炉料运动行为进行研究.结果表明:鼓风动能增加,风口回旋区加深并没有改变高炉上部的料层结构与分布状况,而是使得高炉下部死料柱变小,变矮,其对上部炉料的支撑作用减弱,致使上部炉料的下降速度明显增大,冶炼强度得以提高.风口中心线以上2m处炉腹段,炉料的运动速度与应力分布......
; 文献标志码:A 文章编号:1672-7207(2016)10-3409-08 D-FNN predictive control for burning zone temperature in rotary kiln with IPSO algorithm TIAN Zhongda1, GAO..., Northeastern University, Shenyang 110819, China) Abstract: In order to improve the control performance of burning zone temperature in lime rotary kiln,a predictive control method based on an improved......
and induce the preferred orientation of precipitated S phase. Under the external stress aging, the precipitation free zone (PFZ) is narrowed and the distribution of those precipitates changes from chains... oriented effect; precipitation free zone 2524铝合金具有优良的断裂韧性,疲劳性能和抗应力腐蚀性能,已成功应用在波音777和空客A380大型客机上,成为新一代航空结构材料,被认为是目前最理想的飞机蒙皮材料[1-4].近年来,由于大型客机蒙皮时效成型技术的需要[5-6],关于铝合金的应力时效又成为材料科学与工程研究领域新的研究热点之一. 应力时效是指在时效过程中引入一小于......
with isothermal aging. This is due to the fine and disperse θ″ phase in the grain and the decrease of potential difference between the grain and grain boundary precipitation free zone (PFZ) because of the universal desoluation in the grain after secondary aging. Key words: 2519A aluminum alloy; secondary aging; mechanical properties; corrosion resistance; precipitation free zone 2519铝合金是继5083和7039铝合金后......
boundaries are refined by interrupted aging. The coarse precipitations are distributed discontinuously on the grain boundaries of the single aged sample whose precipitation free zone (PFZ) is widened...; intergranular corrosion; exfoliation corrosion; precipitation free zone (PFZ) 2系变形耐热铝合金由于具有良好的高温性能,加工性能和耐损伤性能等优点被广泛应用于航空工业.现代飞机正向大型,高速,多载方向发展,对航空用铝合金结构材料的强度,耐热性,可靠性和高寿命等提出了更高的要求.Al-Cu-Mg-Ag合金是在传统2系变形耐热铝......