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Non-steady FE analysis on porthole dies extrusion of aluminum harmonica-shaped tube CHENG Lei(程 磊), XIE Shui-sheng(谢水生), HUANG Guo-jie(黄国杰), WU Peng-yue(吴朋越), HE You-feng(和优锋) State Key...-viscoplasticity finite element method, the porthole die extrusion process of an aluminum harmonica-shaped tube was successfully simulated based on software Deform-3D. The distribution of stress field......
-yuan(黄道远) School of Materials Science and Engineering, Central South University, Changsha 410083, China Received 10 April 2006; accepted 25 April 2006 Abstract: The MoSi2 coating on C103 niobium... effectively prevent the diffusion of oxygen into coating. Key words: niobium based alloy; pack cementation; silicide coating; formative mechanism 1 Introduction Nb-based alloys have been used......
New technology for brazing aluminum clustered tube of refrigeratorHE Peng(何 鹏)1, FENG Ji-cai(冯吉才)1, YU Ze-xing(余泽兴)2, JIA Jin-guo(贾进国)2, MAI Han-hui(麦汉辉)2(1. State Key Laboratory of Advanced Welding... brazing for the aluminum clustered tube of refrigerator was analyzed. According to characteristic of aluminum and aluminum alloy, a kind of high frequency power supply was devised and applied......
J. Cent. South Univ. (2021) 28: 1206-1218 DOI: https://doi.org/10.1007/s11771-021-4690-1 Effects of niobium addition on microstructure and properties of CPM121 powder metallurgy high-speed... compacted and activation sintered with near-full density (>99.0%) using pre-oxidized and ball-mixed element and carbide powders. Niobium-alloyed steels (w(V)+w(Nb)=10 wt.%) show higher hardness and wear......
Some Characteristics of Niobium Mineral Resources of Low and Medium Grade Oxide Ores in the Main and Eastern Mining Areas at the Bayan Obo Mine陈泉源,余永富摘 要:niobium minerals resources.The disseminationcharacteristics and processing properties of four types of niobium minerals......
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Segregation and diffusion behavior of niobium in a highly alloyed nickel-base superalloy PAN Xiao-lin1, YU Hai-yan1, TU Gan-feng1, SUN Wen-ru2, HU Zhuang-qi2 1. School of Materials and Metallurgy...: The segregation during solidification and high temperature diffusion during homogenization of niobium in a highly alloyed nickel-base superalloy were investigated. Niobium is seriously segregated......
micro groove copper(MGC) tube. Then the bonding of MGC tube was reached because of intensively plastic deformation of MGC tube under pressure. It is found that the plastic deformation area of the cold welding of MGC tube can be divided into three sections. The deformation of micro grooves in each section was investigated; the influence of the dimensions of cylindrical heads on the weld joint shape......
与气体间非绝热损失的存在使得脉管要达到较高的膨胀效率需采用更大的体积；脉管体积直接影响管壁和管内气体的温度分布,从而影响管壁与气体间的热损失以及气体自身温度不均匀产生的热损失；若对脉管进行一维或绝热假设忽略脉管热损失的影响,则会使脉管尺寸的设计值偏离实际最佳值.关键词:二维；非绝热；脉管体积；脉管效率Pulse tube losses mechanism based on a two...-adiabatic CFD model was proposed to study the relationship between the void volume and expansion efficiency of pulse tube at 80-300 K. The gas physical parameters were analyzed. The results show......
Effect of Replacing Vanadium by Niobium and Iron on the Tribological Behavior of HIPed Titanium AlloysMamoun Fellah1,2,Linda Aissani2,3,Mohammed Abdul Samad4,Alain Iost5,Alex Montagne54. Mechanical... of replacing vanadium by niobium and iron on the tribological behavior of hot-isostatic-pressed titanium alloy(Ti–6Al–4V)biomaterial,using a ball-on-disk-type oscillating tribometer,under wet......
