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net shaping (LENS) is a upcoming rapid manufacturing technology developed around the world. LENS is capable of near net shaping the components by layer-by-layer deposition of material directly from CAD model using laser. In addition to the processing advantages in net shape, solid freeform and dramatically shortened cycle times are developed for engineering systems. LENS can be used not only......
of dislocations at grain boundary. Key words: TiAl alloy; near net shape; powder metallurgy; high-temperature mechanical properties 1 Introduction TiAl-based alloys are considered as promising... of the sample, the HIPed near net shaped part is obtained (Fig. 1(d)). Fig. 1 Powder metallurgy Ti-45Al-7Nb-0.3W near net shape mold core model (a), HIPed specimen with steel package (b), photograph......
. Firstly, the mixed elemental powders were cold pressed into a mushroomed head of the valve. Then the compacts were pseudo HIPed, in which both the material synthesis and near net shaping were realized... exhaust valve; near net shaping; Received: 1999-01-02 TiAl基合金是一种新型的轻质高温结构材料, 它除了具有高的比强度, 比刚度外, 还具有良好的高温抗氧化性能和一定的高温蠕变强度及高温抗疲劳能力, 因而一直备受材料研究工作者的关注 [1,2,3] . 目......
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Article ID: 1003-6326(2005)02-0340-04 Two-way shape memory effect and its stability in Ti-Ni-Hf high temperature shape memory alloy MENG Xiang-long(孟祥龙), WU Ye(吴 冶), CAI Wei(蔡 伟), ZHAO Lian-cheng(赵连城) (School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China) Abstract: The two-way shape memory effect(TWSME) in a Ti36Ni49Hf15 high......
近终形连铸(Near Net Shap Casting)技术的发展蔡开科摘 要:<正> 传统的钢水凝固成形方法是钢锭模浇铸.钢锭重量从几百公斤到几吨,十几吨.把厚度以米计的钢锭轧制成几十毫米,几毫米甚至于小于一毫米的薄板产品,中间重复加热次数多,加工能量消耗大,设备庞大,生产流程长,金属消耗大,成材率低. 经过近30年的努力,连续铸钢已逐渐取代钢锭模浇铸,这是钢生产流程中的一次重大革新.世界各国广关键词:......
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Article ID: 1003-6326(2005)06-1237-05 R-phase transformation of aged Ti-Ni shape memory alloy GONG Chang-wei(宫长伟), WANG Yi-nong(王轶农), YANG Da-zhi(杨大智), LIU Xiao-peng(刘晓鹏) (Department of Materials Engineering, Dalian University of Technology, Dalian 116024, China) Abstract: Ti-50.6Ni(molar fraction, %) shape memory alloy solution treated at 850℃ for 1h followed by ageing treatment......
Size and shape effects on Curie temperature of ferromagnetic nanoparticles CAO Ling-fei(曹玲飞)1, XIE Dan(谢 丹)2, GUO Ming-xing(郭明星)3, H.S. Park1, T. Fujita1 1. School of Engineering, University... on a size and shape dependent model of cohesive energy, the critical temperature variations of ferromagnetic nanoparticles were deduced. It is predicted that the Curie temperature of nanoparticles......
Laser surface alloying fabricated porous coating on NiTi shape memory alloy ZHANG Song(张 松)1, ZHANG Chun-hua(张春华)1, 2, MAN Hau-chung(文效忠)3, LIU Chang-sheng(刘常升)2 1. School of Materials Science... on a solid NiTi shape memory alloy. By laser surface alloying a 40%TiH2-60%NiTi powder mixture on the surface of NiTi alloy using optimized laser process parameters, a porous but crack-free NiTi layer can......
