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Hot forming die with synchronous cooling (Unit: mm) 图2 试验流程图 Fig. 2 Flow-sheet of forming experiment 图3 单拉试样的示意图 Fig. 3 Schematic diagram of specimens for uniaxial...由于时间较短并不能消除成形过程中增加的所有位错,从而提高了试样的位错密度. 图5 同步冷却热成形试样弯曲截面的光学显微组织 Fig. 5 Microstructures of cross section in formed region of hot forming with synchronous cooling sample 经过同步冷却热成形及96h自然时效后的......
Fatigue life prediction of gas metal arc welded crucifrom joints of AA7075 aluminium alloy failing from root region B. RAVINDRA1, T. SENTHIL KUMAR2, V. BALASUBRAMANIAN3 1. Department... 10 January 2011 Abstract: Empirical relationship was developed to predict the fatigue life of gas metal arc welded (GMAW) cruciform joints failing from root region. High strength, age hardenable......
STUDY ON NANOMETER ZINC PARTICLES FABRICATED BY GAS EVAPORATION METHOD Y.Fu1,A.A.A.Saleh1,Y.C.Zhai1,A.L.Zhang1,X.J.Zhai1 (1.School of Materials and Metallurgy, Northeastern University, Shenyang,110004, China) Abstract:Nanometer Zn particles with mean diameters 12-100nm made by evaporating its powders in argon gas were studied mainly by X-ray diffraction and electron microscopy.They......
gas scatter angle. The results show that the structure of primary atomizer plays an important role in the flow field near the exit of delivery tube. Metal protector with conical surface at the body... on pressure distribution and gas velocity streamlines is shown in Fig.3. The structure of metal protector and the length of delivery tube out of the metal protector play an important role in the flow......
During spray forming, a liquid metal stream is disintegrated into a spray of droplets by high-pressure gas jets and the droplets are subsequently propelled toward a substrate where they impinge... is the distance from the atomizer to the reference plane; as and bs, which are associated with the configuration of the atomizer, the diameter of the metal melt delivery nozzle, the gas pressure[17] as well......
oxidized by carbon dioxide gas: (a) Raw MWNTs; (b) Purified MWNTs 3.2 Microstructures and hardness of hot press sintered composites Fig.3 shows the TEM image of the hot pressed composites. It can... Multi-wall carbon nanotubes reinforced aluminum composites synthesized by hot press sintering and squeeze casting ZHANG Xue-xi(张学习), YANG Li(杨 丽), DENG Chun-feng(邓春锋), WANG De-zun(王德尊......
, China;2.Harbin Research Institute of Welding, Harbin 150001, China) Abstract:Laser forming involves heating sheet metal workpiece along a certain path with a defocused laser beam directed irradiate... the thermalmechanical forming of complex shapes. This is a new manufacturing technique that forming metal sheet only by thermal stress. Therefore, the analysis of temperature fields and stress fields......
; hot tearing susceptibility; Ni-based superalloys; segregation 1 Introduction K418 and K419 were developed in 1970s and used as vanes and blades for gas turbine and turbocharger turbine. Due... of precision cast hot end turbocharger turbine wheel in automotive and shipping industry. As a multi-component alloy, the constituents of K419 are complex because of the more γ′ forming elements......
production precision, low surface roughness and convenient mould unloading for near-net shape forming. 4 Conclusions 1) The hot compression results of AZ80 alloy show that the peak flow stresses... restraining metal flow and then extrusion is attained with a low flow stress. 2) The FEA results indicate that extrusion from hollow billet can reduce the maximum forming load because of the decrease......
Optimizing pulsed current gas tungsten arc welding parameters of AA6061 aluminium alloy using Hooke and Jeeves algorithm S. BABU1, T. SENTHIL KUMAR2, V. BALASUBRAMANIAN1 1. Centre for Materials... is frequently constant current gas tungsten arc welding (CCGTAW), it resulted in grain coarsening at the fusion zone and heat affected zone(HAZ). Hence, pulsed current gas tungsten arc welding(PCGTAW......
