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Structure and sliding wear behavior of 321 stainless steel/Al composite coating deposited by high velocity arc spraying technique CHEN Yong-xiong(陈永雄), XU Bin-shi(徐滨士), LIU Yan(刘 燕), LIANG Xiu... (321/Al coating) was prepared by high velocity arc spraying technique (HVAS) with 321 stainless steel wire as the anode and aluminum wire as the cathode. The traditional 321 stainless steel coating......
Theory and application research development of semi-solid forming in China LUO Shou-jing(罗守靖)1, W. C. KEUNG(姜永正)2, KANG Yong-lin(康永林)3 1. School of Materials Science and Engineering, Harbin... of globular grains, rheology, high pressure solidification and plastic deformation and applications, such as material design, preparation of semi-solid billets (slurries), thixoforming and application status......
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and plastic strain were analyzed. Key words: electromagnetic forming; high velocity forming; numerical simulation; finite element mode; magnetic force 1 Introduction Electromagnetic forming (EMF) is one... at the center. There are two peak values in strain rate during the forming process. The first one occurs due to the extrusion force at the center before 40 μs. The second one occurs due to the high velocity......
to move the forming tool. The tool movement was controlled using predefined displacement constraints in several load steps. Using an artificially high tool velocity to substitute for the real process... for the high forming limits obtained experimentally. Node C on the blank was chosen to investigate the effects of process parameters on the maximum principle stress. With the tool diameter increasing (α=45......
are established respectively. First, the transient magnetic forces are calculated from the electromagnetic model, which are then used as the input load to simulate the tube’s high velocity deformation... with the decrease of the coil length, which illustrates the maximum forming velocity with C3.4.5 Plastic strain energy of tube Keeping the discharge energy constant, the shorter coil can improve the energy......
forming, the melted or self-melted droplets are accelerated and injected onto the spray mould or the deposited layer. At impact, due to the sudden deceleration, the droplets flatten and the high-pressure... Numerical simulation of splat formation dynamics in plasma spray forming FANG Jian-cheng(方建成)1, WANG Li(王莉)1, XU Wen-ji(徐文骥)2, ZHAO Zi-yu(赵紫玉)1 1. College of Mechanical Engineering and Automation......
; Abstract: Three types of FeMnCrAl/Cr3C2 coatings with different Al content were deposited on 20# steel substrates by the high velocity arc spraying (HVAS) process. Surface microstructures of the coatings... in the range of 60?-90? impact angles. Erosion loss of the coatings occurs through brittle breaking, cutting and fatigue spalling. Key words: high velocity arc spraying (HVAS); coating; erosion......
粉末冶金高速压制技术及其应用 蔡一湘1,闫志巧1,陈峰1 (1.国家钛及稀有金属粉末冶金工程技术中心,广州有色金属研究院粉末冶金研究所,广州,510651) 摘要:高速压制技术(HVC)是2001年瑞典提出的一种先进的成形技术,兼有动态压制的高冲击能量和传统压制的高速平稳性等多重特征,可广泛用于金属,陶瓷和聚合物等材料的成形.介绍了HVC技术的原理.论述了该技术与其它成形技术相比具有成本低,压坯密度高且分布均匀,低弹性后效和高精度,模具使用寿命长等特点.讨论了HVC技术对所用模具和原料粉的要求.介绍了HVC技术的研究进展,并对实际生产应用前景进行了展望. 关键词:粉末冶金; 高速压制; 高密度; 成形; powder metallurgy; high velocity compaction; high density; forming; [全文内容正在添加中] ......
forming of light alloy sheet parts can be realized based on the properties of granule medium, such as withstanding high temperature and pressure, filling well, sealing and loading easily. In this work... after forming. Hot hydro-mechanical deep drawing process is especially suitable for the manufacturing of sheet parts with complex shape, varied sizes, high-quality appearance and small batch, which......