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凝固传热模型在静态轻压下技术中的应用刘伟1,刘浏1,何平1,高辉2,陆长河3(1.北京市钢铁研究总院工艺所2.满特殊钢有限责任公司,黑龙江齐齐哈尔 16110413.北满特殊钢有限责任公司,黑龙江齐齐哈尔 1611041)摘 要:在实测铸坯表面温度的基础上,通过对各冷却段界面换热系数进行修正,建立了适合实际工况条件的凝固传热数学模型,并将模型计算结果应用于静态轻压下试验中,取得了良好的效果.研究结果表明:实施轻压下最佳的工艺条件为:过热度10~30℃,二冷比水量0.28 L/kg,拉速0.85 m/min,压下......
that the amount of droplets on AlTiN coating surface increases with the increase of addition of Cu, but the grain size of it is refined, and the structure is more compacted, and the porosity decreases. Compared...-Cu; AlTiN/AlTiN-Cu; Tafel polarization curve; electrochemical impedance spectroscopy; porosity 传统的氮化物硬质涂层(如TiN,CrN和TiAlN等)在一般情况下不易与腐蚀介质反应,表现出良好的耐腐蚀性能[1].但是,在物理气相沉积过程中,涂层生长往往会伴随生成孔洞,微裂纹等缺陷,为腐蚀介质进入基体界面......
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of titanium hydride and Al alloy foam with low porosity and small pore diameter YANG Dong-hui, HE De-ping (Department of Materials Science and Engineering, Southeast University, Nanjing 210096... gas. The relationships between the porosity of Al alloy melt foam and foaming time at 940K are gained by displacement sensor-computer system. Pore structures of Al alloy melt foam with different......
工艺参数对爆炸喷涂WC-Co涂层性能均匀性的影响王铁钢1,宋丙红2,华伟刚1,宫骏2,孙超2(1.辽宁省沈阳市科学院金属研究所金属腐蚀与防护国家重点实验室2.中航工业哈尔滨东安发动机(集团)有限公司,哈尔滨 150066)摘 要:采用正交实验,分别研究了氧燃率,喷涂距离对爆炸喷涂WC-Co涂层性能的影响.通过工艺优化,获得了结构均匀致密,硬度高,弹性模量大,耐磨性能好的WC-Co涂层.利用XRD和SEM分析涂层的物相组成,观察其微观结构,经截面与表面力学性能和磨损性能对比,优化后的涂层表现出近似各向同性特征.分......
that copper porous materials with paraffin as porogen have lower porosity and permeability compared with materials using methylcellulose as porogen, due to the different pore-forming mechanisms... between adjacent powders, which further influence the sintering shrinkage. The porous materials using arborescent copper powders as matrix have lower porosity, smaller pore size and lower permeability......
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transitional foaming process was discussed and the effect of granularity and addition of TiH2 on porosity of closed-cell aluminum foam was investigated. The static compressive behavior of closed-cell aluminum foam and the influence of porosity on static compressive property of closed-cell aluminum foam were researched as well. The results show that with increasing granularity of TiH2, the porosity of closed......
