共搜索到4660条信息，每页显示10条信息，共466页。用时：0小时0分0秒292毫秒
Effects of microalloying on grain refinement behaviors and hardness properties of wedge-shaped Al-Mg-Mn castings LIU En-ke(刘恩克), YANG Fu-bao(杨福宝), XU Jun(徐骏), SHI Li-kai(石力开) National...; Abstract: The effects of microalloying elements Ti, Sc, Zr and Er on grain refinement behaviors and hardness properties of wedge-shaped Al-Mg-Mn alloy castings......
In-situ synthesis of TiC/Fe alloy composites with high strength and hardness by reactive sinteringJunho Lee1,Dongju Lee2,Ho Jin Ryu1,4,Soon Hyung Hong11. Department of Materials Science... insufficient carbon(C/Ti = 0.8)caused the depletion of carbon from the Fe alloy matrix,leading to a significant decrease in hardness.This study presents that the maximized hardness and superior strength......
Microstructures and Hardness Properties for β-Phase Ti-24Nb-4Zr-7.9Sn Alloy Fabricated by Electron Beam MeltingJ.Hernandez1,S.J.Li2,E.Martinez1,L.E.Murr1,X.M.Pan3,K.N.Amato1,X.Y.Cheng2,F.Yang2,C... microindentation hardness values were observed to average 2 GPa for the precursor powder and 2.5 GPa for the solid,EBM-fabricated products.The powder and solid product microstructures were examined......
......
Hot Deformation Behavior and Hardness of a CoCrFeMnNi High-Entropy Alloy with High Content of CarbonYi-Tao Wang,Jian-Bo Li,Yun-Chang Xin,Xian-Hua Chen,Muhammad Rashad,Bin Liu,Yong Liu摘 要:hardness value of 345 HV.The carbides after deformation at 1000 ℃ are mainly nano-sized M7C3......
; Abstract: The microstructural characteristics and Brinell hardness of a cylinder produced by centrifugal casting were investigated using 20% (volume fraction) SiCp/Zl104 composites... in aluminum melt can promote the refinement of primary α(Al) during solidification, and fine primary α(Al) grains can also promote the uniform distribution of SiC particles. Brinell hardness of SiCp/Zl104......
layer by layer. This study demonstrates fabrication, the anisotropy of mechanical properties and hardness of a graded steel. The characteristics of constituent phases, microstructure, mechanical......
with the temperature increasing below β phase transition point. Moreover, it can be also seen from hardness test that the hardness of the alloy increases firstly and then decreases with the temperature increasing. Key words: BTi-62421S alloy; hot deformation; microstructure; hardness 钛合金具有高比强度,抗蠕变性能,耐高温和耐腐蚀性,是一种重要的金属结构材料,在航空航天等领域得到广泛的应用[1-5].然而,由于钛合金材料昂贵,变形加工困难,成形工艺复杂,导致了其制件成本较高[6-7].现在,有人提出由铸造坯料直接塑性变形成形复杂制件方案[8......
. But if the amount of RE is raised further, the currentdensity decreases. Hardness and wear resistance of RE-Ni-W-P-SiC composite coat-ing have been studied, and the results show that the hardness and wear resistance ofRE-Ni-W-P-SiC composite coating increase with increasing heat treatment tempera-ture, which reach peak values at 400℃; while the hardness and wear resistance of thecoating decrease......
of different nano-CeO2 contents composites, the best corrosion resistance and hardness, and the optimum content of nano-CeO2 were achieved. The result shows that corrosion resistance, hardness and uniformity of metal structure can be improved significantly with nano-CeO2; at the same time, the optimal corrosion resistance, hardness and microstructure are obtained when the mass fraction of nano-CeO2......
