硅铝铸铁的吸氧倾向及脆性探讨

硅铝铸铁是一种较好的抗腐蚀耐高温的铸铁材料，但脆性较高及熔炼上的困难限制了它的广泛应用，本文从热力学的角度对其脆性机理进行了探讨，认为硅铝铸铁在熔炼时具有较大的吸氧倾向，其含氧量高是性能的重要原因。采用覆盖法熔炼及缩短熔炼时间，可使硅铝铸铁的冲击韧性大为提高。     

“熔炼”课件的设计与制作

熔炼课件包括"熔炼","感应电炉熔炼","电阻炉熔炼","冲天炉熔炼","铸件配料系统","铸铁成分热分析"6个知识点。除了熔炼基本知识外,课件可进行铸钢、铸造非铁合金、铸铁材料配料,得出最低价格的优化结果;对铸铁成分热分析进行模拟检测,对冲天炉熔炼过程进行模拟。课件基于工程训练及网上教学,突出了知识面广,反映了生产实际,技术含量高等特点,反映了那些看不见、不能摸的状态。     

冲天炉熔炼过程中终硫量的估算

本文给出了在一定生产条件下用冲天炉熔炼铸铁时估算铁水中终硫量的方法,并在生产中将估算值与实测值进行了比较,证明冲天炉熔炼铸铁过程中铁水的终硫量是可以较为准确地估算的,这对控制铸铁件质量具有重要意义。     

磨球用低合金抗磨铸铁化学成分的选择与设计

材料的化学成分对其组织、性能有着相当大的影响,只有选择最佳的抗磨铸铁化学成分,才能保证其获得良好的抗磨性能。文章在综述有关文献资料的基础上,提出了适于冲天炉熔炼的磨球用低合金抗磨铸铁的化学成分范围,并通过试验研究,确定出磨球用低合金抗磨铸铁的最佳化学成分。     

稀土低碳白口铸铁磨球的研制与应用

本文分析了一种珠光体型白口铸铁－稀土低碳白口铸铁作为电厂磨煤机磨球材料的可行性、 讨论了它的成分与配料、熔炼控制与变质处理、铸型工艺与铸件冷却等问题。耐磨试验与工业应 用试验表明：稀土低碳白口铸铁磨球使用情况良好，在软磨料磨损条件下是优良的抗冲击磨损材料。     

纤维网在铝铸铁上的应用研究

纤维网在铝铸铁上的应用研究李长虹（北方交通大学机械系，北京１０００４４）铝铸铁作为一种耐高温、抗氧化及耐腐蚀的合金材料，具有广阔的应用前景［１］［２］。但由于其废品率较高，脆性较大，限制了它的广泛应用。铝铸铁中含有较多的铝，氧化倾向较大。在空气中熔炼...     

铸铁脱硫的实验研究

通过中频感应炉熔炼废铁屑进行铸铁脱硫的实验研究，阐述了炉内脱硫、炉外脱硫的实验研究方法，探索了苏打脱硫的实施方法和规律。     

无芯工频电炉熔炼活塞环合金铸铁获得成功

我们宁波活塞环厂的广大革命职工,通过史无前例的无产阶级文化大革命的锻炼,阶级斗争和路线斗争的觉悟大大提高。在“工业学大庆”的群众运动,革命职工遵循伟大领袖毛主席关于“独立自主、自力更生”和“一切产品,不但求数量多,而且求质量好”的教导,发扬敢想敢干的革命精神,在上级的支持和兄弟单位的帮助下,奋战三个半月的时间,试制成功一台0.5吨无芯工频电炉,并于六月三十日晨熔炼出第一炉活塞环合金铸铁,向党的诞生五十周年献了礼。我厂生产的筒型活塞环,原采用冲天炉熔炼铬钼铜合金铸铁的。用冲天炉熔炼合金铸     

钇基重稀土蠕墨铸铁的高温性能研究

利用钇基重稀土资源熔炼蠕墨铸铁,探讨高温条件下灰铸铁和蠕墨铸铁的抗拉强度、氧化增重值、伸长百分率、耐热疲劳性和线性膨胀系数等性能,同时用数理统计的方法推导出两种铸件线性膨胀系数的回归方程.结果表明:高温下蠕墨铸铁的断裂性质为韧窝断裂,其高温抗拉强度明显比灰铸铁高;蠕墨铸铁的抗氧化性和抗生长性均比灰铸铁好而导热系数与灰铸铁相近;灰铸铁和蠕墨铸铁的线性膨胀系数相近,但灰铸铁的相变收缩要比蠕墨铸铁强烈得多.     

电渣铸铁—现状和展望

六十年代末,七十年代初,苏联冶金学者开始了电渣铸铁的研究工作。电渣重熔和电渣精炼过程的脱硫,脱磷、除夹杂、除气等作用对获得优质铁水,提高铸件质量有明显效果。特别是在直流制度下熔炼,有可能发挥电化学作用。有目的地从熔体中排除有害元素或从熔渣中获得合金化元素,因此,试图采用电渣重熔或电渣精炼进行变性处理和合金化取代添加球化剂直接得到球墨铸铁的生产技术引起人们极大的兴趣。 虽然电渣铸铁工艺和生产技术本身尚有改进的方面,而且对某些基本理论的研究仍处于探讨阶段。然而,作为一种铸铁精炼的新方法,有可能从根本上改革现行的生产工艺。 本文收集了十多年来有关电渣铸铁的文献资料,概括了国外有关电渣生铁熔炼的研究内容和成果。结合我国资源条件及工业发展特点,对开展电渣铸铁工艺和理论研究工作提出一些建议。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that