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实际初始WC颗粒尺寸选择的LSW理论分析白英龙1,吴冲浒2,杨霞1,徐猛1,果世驹11. 北京科技大学材料科学与工程学院2. 国家钨材料工程技术研究中心 厦门钨业股份有限公司技术中心摘 要:超粗硬质合金是一类重要的矿用硬质合金.本文作者通过对WC平均晶粒尺寸为7~8μm粗晶硬质合金的烧结实验,并用LSW动力学理论分析液相量相对较少的超粗硬质合金(>5μm)的晶粒生长机制.分析发现,可以用Co对WC晶粒的覆盖度替代LSW动力学中的原子动力学转移系数.经过修正的LSW动力学方程可以用来指导超粗WC(>5μm)实际初始颗粒平均粒度的选择.修正后的LSW动力方程形式为axt2-axo2=0.125(C0γV m2/R)·(t/T).关键词:WC-Co;超粗硬质合金;LSW理论;晶粒生......
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Theory and Modeling of Phase Transformations under Stress in Steel T.Y.Hsu1 (1.School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China) 摘要:Thermodynamic... under stress; theory and modeling; thermodynamics; kinetics; nucleation; additivity hypothesis; ferrous alloys; [全文内容正在添加中] ......
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A novel limiting strain energy strength theory LIU Guang-lian(刘光连) School of Mechanics & Electrical Engineering, Central South University, Changsha 410083, China Received 10 August 2009...; Abstract: With applied dislocation theory, the effects of shear and normal stresses on the slide and climb motions at the same section of a crystal were analyzed. And, based on the synergetic......
Article ID: 1003-6326(2005)02-0243-04 Machinability evaluation of machinable ceramics with fuzzy theory YU Ai-bing(于爱兵)1, ZHONG Li-jun(钟利军)1, TAN Ye-fa(谭业发)2 (1. Key Laboratory of Advanced...) Abstract: The property parameters and machining output parameters were selected for machinability evaluation of machinable ceramics. Based on fuzzy evaluation theory, two-stage fuzzy evaluation approach......
Theory of Nucleation on Dislocations雍岐龙摘 要:<正> Cahn’s theory of nucleation on dislocationshas been analyzed thoroughly and the imperfectionof the theory in some cases has been discussed.Arevised theory has been proposed with applicationto the problem of precipitation of M(CN)phase inaustenite.关键词:......
Density functional theory study on hydrogenation mechanism in catalyst-activated Mg(0001) surface WU Guang-xin(吴广新)1, LIU Su-xia(刘素霞)1, ZHANG Jie-yu(张捷宇)1, WU Yong-quan(吴永全)1, LI Qian(李 谦... of Fe3O4 catalyst is known to substantially improve the adsorption and desorption thermodynamics and kinetics of Mg-based materials. Using density functional theory in combination with nudged elastic......
J. Cent. South Univ. Technol. (2008) 15: 112-116 DOI: 10.1007/s11771-008-0022-y Failure analysis of polycrystalline diamond compact cutters for breaking rock by bending waves theory...; Abstract: The breakage mechanism of the polycrystalline diamond compact(PDC) cutters was analyzed by the energy theory of bending waves. The cutting tests of granite......
