共搜索到34387条信息,每页显示10条信息,共3439页。用时:0小时0分0秒453毫秒
Ageing process of pre-precipitation phase in Ni0.75Al0.05Fe0.2 alloy based on phase field method DONG Wei-ping1, WANG Yong-xin1, CHEN Zheng1, 2, YANG Kun1 1. College of Materials Science... 2010; accepted 9 September 2010 Abstract: By utilizing phase field method combined with analysis on free energy and interatomic potentials, pre-precipitation phase formation and transformation......
and Bioengineering, Central South University, Changsha 410083, China) Abstract: The field characteristics of coherent jet and conventional supersonic jet was studied by numerical simulation and experiment under different shrouding gas parameter conditions. The results show that the temperature and pressure of the nozzle exit is affected by shrouding gas and it leads to velocity and temperature......
method according to velocity and geometric relationships of instant velocity centers can easily determine each contact point at any instant moment. The cam profile was defined by contouring... to confirm the accuracy on the breadth cam profile design by computer animation graphically. Key words: cam profile; breadth cam; reciprocating follower; oscillating follower; instant velocity center......
numerically by using Runge-Kutta-Fehlberg scheme. An analysis of the present study has shown that applied magnetic field, porosity of the medium, velocity slip and inertia coefficient account for the slowing... radiation and Joule heating. The disk at z=0 spins with constant angular velocity Ω. The velocity components (u, v, w) are in the directions of increasing (r, f, z) respectively. A magnetic field......
Modeling and Simulation of Heat Transfer in Loaded Continuous Heat Treatment Furnace () 摘要:Continuous furnaces are widely used in the heat treatment of mass-produced parts. However, the heating up process of parts in continuous furnace is still decided by experience. In this paper the heat transfer in the continuous furnace is formulated firstly. The heat balance in each zone is discussed......
Experimental and field study on dissipation coefficient of supersaturated total dissolved gasFENG Jing-jie(冯镜洁), LI Ran(李然), MA Qian(马倩), WANG Le-le(王乐乐) (State Key Laboratory of Hydraulics... the dissipation coefficient accurately. In agreement with field observations and experiment data, dimensional analysis and regression were performed to propose a formula for estimating the dissipation coefficient......
结晶器电磁搅拌工艺参数选择及优化郭浩1,金永龙2,吴飞鹏2,郭祥军2(1.辽宁科技大学 材料与冶金学院,辽宁鞍山 1140512.唐山钢铁集团有限责任公司,河北唐山 063016)摘 要:以某钢厂结晶器为研究对象,开发该型结晶器的电磁搅拌技术,测定电磁搅拌的特征及实际对应冶金效果,从而针对性的选取经济可靠的工艺参数,对比有或无电磁搅拌对铸坯内部质量优化的效果.结果表明:通过对电磁搅拌工艺参数的选择及优化,铸坯中心等轴晶区增加,宽面平均增加50.5mm,线性比率为41%;窄面平均增加94.5mm,线性比率为59%......
%, the pressure drop curves become smoother, the minimum fluidized velocity decreases, bed expansion rises and the fluidization characteristics of agglomerate particle are better. Decreasing the size of FCC particles, the same results are obtained. Adding 109-120 μm FCC 30%, the mixture is in a good fluidization. The mixture adding amount of 20% FCC with 96-109 μm can be fluidized and gas velocity......
热冷组合铸型(HCCM)水平连铸制备金属管坯原理图 Fig. 1 Schematic diagram of horizontal continuous casting of tube billets by HCCM 热冷组合铸型水平连铸实验过程描述如下:将5A02铝合金置于熔化坩埚1中熔化,提升塞棒3使得金属液流入保温坩埚;对铸型的热型段进行加热,对冷型段通冷却水;当保温坩... Table 2 Experimental processing parameters of HCCM horizontal continuous casting for fabricating 5A02 aluminum alloy tube billets 1.3 组织与性能检测 连铸得到d 70 mm×6 mm规格的5A02铝合金管坯,如图2(a)所示.采用线切割沿管坯......
at different cooling velocity. Key words: Al-Zn-Mg-Cu alloy; continual resistance testing method; continuous cooling transformation curve  ...分类号:TG 151 文献标识码:A Testing of continuous cooling transformation curve of Al-Zn-Mg-Cu alloy LI Hong-ying, TANG Yi, ZENG Zai-de, WANG Fa-yun, SUN Yuan (School......