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| 1 | 对流和弥散相液滴运动对偏晶合金凝固的影响显示文摘偏晶合金非常广泛,许多具有重要的工业应用前景,但该类合金具有液态组元不混溶温度区间,当均一的合金熔体冷却进入组元不混溶温度区间时,它分解成两个液相,即发生液-液相变,因此,极易形成偏析严重的组织,这不仅限制了该类合金的制备,也为其凝固理论研究带来极大困难.研究表明,偏晶合金液-液相变过程十分复杂,影响因素众多,尤其是弥散相液滴运动和基体熔体对流使各影响因素相互混淆,致使偏晶合金凝固组织演变过程研究极为困难.综述了弥散相液滴运动和基体熔体对流对偏晶合金液-液相变过程的影响及研究现状. | 赵九洲 李海丽 赵雷 | 2009 | 金属学报2009，45，12： | 7 |
| 2 | 射流型磁场排布方式控制结晶器内液流的实验研究显示文摘以水银为介质,通过物理模拟实验考察射流型磁场排布方式对中厚板坯连铸结晶器内流场的控制.采用超声波Doppler测速仪测量有,无磁场下的结晶器内液态金幅流速,研究磁场排布和强度对水口出流,结晶器内流动、液面流动、结晶器窄面模壁的冲刷作用等的影响.实验显示,射流型磁场排布方式使水口出流流速受到比通常磁场排布方式更强的抑制作用,使其在撞击结晶器窄壁前发生分散,可使上环流流速增强,下环流减弱直至消失,直接形成活塞流形式;同时,还改善了弯月面处流动情况.相比于工业生产中的全幅一段电磁制动技术,射流型磁体排布方式的电磁制动在水口出流、液面处流动方面具有更强的制动作用. | 王寅 张振强 于湛 贾皓 邓康 雷作胜 任忠鸣 | 2011 | 金属学报2011，47，10： | 5 |
| 3 | Solidified structure of thin-walled titanium parts by vertical centrifugal casting显示文摘The solidified structure of the thin-walled and complicated Ti-6Al-4V castings produced by the vertical centrifugal casting process was studied in the present work.The results show that the wall thickness of the section is featured with homogeneously distributed fine equiaxial grains,compared with the microstructure of the thick-walled section.The grain size of the castings has a tendency to decrease gradually with the increasing of the centrifugal radius.The inter-lamellar space in thick-walled casting parts is bigger than that of the thin-walled parts,and the profile of inter-lamellar space is not susceptible to the centrifugal radius. | Wu Shiping Xu Qin Zhang Jun Nan Hai Xue Xiang Guo Jingjie | 2011 | China Foundry2011，8，2： | 4 |
| 4 | Effect of Microalloying,Principally With Vanadium,Processing Conditions and Microstructure on Resistance to CO_2 Corrosion显示文摘One driver for steel development over recent decades has been the engineering requirements of improved strength and toughness,combined with weldability,for the safe and cost effective recovery and transmission of oil and gas.This has been achieved through refinement of grain size by microalloy precipitation and thermomechanical processing.However,little attention has been paid to these significant changes in steel chemistry and processing on corrosion resistance,despite the dominance of economic carbon steel for construction in the oil and gas industries.The more common forms of corrosion are associated with the presence of H 2 S or CO 2.CO 2 in aqueous solution forms a weak acid sufficient to promote significant localized corrosion in transmission gas/oil pipelines and in well-head applications ('down-hole').Systematic study has identified the influence of a wide range of alloying elements and different processing conditions on the resistance of low-carbon steels to CO 2 corrosion;strong carbide-forming microalloying elements such as Ti,Nb and V,along with Cr additions,and different levels of Mn,Si,Cu,Mo and Ni,have been explored,along with treatments simulating different processing conditions.The present study also emphasizes the role of V and Ti microalloying in improving the resistance of Cr-containing carbon steel to corrosion in carbonic acid and how this is influenced by microstructure and the metallurgical condition of the microalloying addition,in particular,the extent of precipitation.It is noted that some commercially available corrosion inhibitors contain V as a vanadate compound to interfere with the corrosion process and so it is suggested that V microalloying may also be beneficial if present in an appropriate form in the steel.That Ti also seems to play a role in corrosion in the steels studied is judged to be compatible with the thermodynamics of transition metal anions in the Ti-V-Cr group. | Edmonds David Cochrane Robert Grau Rosa | 2011 | Journal of Iron and Steel Research(International)2011，18，S1： | 1 |
| 5 | 硅酸盐对Ferrihydrite相转化为α-Fe2O3微粒形貌的调控作用显示文摘以Ferrihydrite(又称水合氧化铁hydrous iron oxide)为反应前驱物,Fe(II)为催化剂,在微量Na2SiO3存在下,控制pH=6~9范围内合成出了亚微米级纺锤形和准立方形α-Fe2O3微粒.研究了初始pH,Na2SiO3浓度,Ferrihydrite老化方式对相转化时间和产物形貌的影响,利用XRD,SEM等手段对产物进行了表征.结果表明,Na2SiO3对Ferriihydrite催化相转化有一定的抑制作用,是影响其相转化过程及产物形貌的关键.在弱碱性条件下,[Si]/[Fe3+]为0.01时可直接获得纺锤形(轴比≥2)或准立方形(300~400nm)α-Fe2O3粒子,并对形成机理进行了初步讨论. | 王欣 刘辉 魏雨 李彦涛 赵新强 王延吉 | 2008 | 化学学报2008，66，6： | 0 |
| 6 | 双金属铸焊复合辊套的制备工艺显示文摘介绍了一种低合金钢套筒与高铬铸铁工作层复合的双金属铸焊工艺。该工艺是在铸造好的套筒上堆焊一层熔点低于工作层的金属,通过电磁感应线圈的预热和浇注工作层金属液时的加热,以堆焊层为中间材质的过渡方式,将套筒与工作层均匀地复合在一起。结合Fe-Cr-C三元系液相线相图确定堆焊层成分,并采用正交试验的方法对堆焊工艺参数进行优化。通过COMSOL Multiphysics软件模拟不同预热温度时套筒的应力分布云图和感应加热温度场分布,对套筒的预热温度及预热时间进行选择。当工作层浇注温度1440℃,套筒预热温度900℃,感应加热时间60 s时,成功制备出熔合层均匀、无夹杂缺陷的铸焊复合辊套,验证了该工艺方法的可行性。 | 王迪 荣守范 李丹丹 焦仁宝 李洪波 王俊发 | 2020 | 铸造2020，69，8： | 0 |
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