Q235钢—冷模具钢轧制复合刀片的组织性能

本文对Ｑ２３５钢－冷模具钢轧制复合刀片的组织和性能进行了研究。结果表明，Ｑ２３５钢－冷模具钢轧制度合界面部位形成了冶金结合，轧制复合刀片的整体力学性能优于整体刀片和焊接复合刀片。     

控冷热处理对普通碳钢组织和性能的影响

为了改善矿用支护型钢的强韧性,研制了型钢控冷热处理生产线并且研究了控冷对普通碳钢组织和性能的影响。试验结果表明,通过调整控冷装置的运行参数（ｐ／ｖ值）可有效地控制普通碳钢的力学性能。Ｑ２３５和Ｑ２７５钢的屈服强度经控冷后提高５０％以上而其伸长率（δ５）分别保持在２０％和１６％。分析了钢的控冷强化机制以及铁素体和魏氏组织铁素体对钢的性能的影响。     

中强度低碳钢筋强韧化研究

研究了Ｑ２３５Ａ（Ａ３）钢民用建筑钢筋在双相区（Ｆ＋Ｍ）淬火后冷拉组织和性能的变化。发现双相区淬火钢丝比热轧态或正火态的能显著提高加工硬化率和强度。（Ｆ＋Ｍ）双相中的低碳马氏体具有良好塑性和冷加工性能。改变双相中的马氏体量和拉拔道次能有效地控制钢筋的强度和塑性，以达到节约建筑用钢的目的。     

Q235钢在油田注水系统中的腐蚀及其影响因素的研究

利用人工神经网络技术对Ｑ２３５钢在中原油田注水系统中的腐蚀进行了研究。所用网络结构为１４－１５－１的形式,以试验用水的温度和水质成分等１４种环境因素作为网络输入,以Ｑ２３５钢在试验用水中的平均腐蚀速度作为网络输出。学习算法为反向传播算法。结果表明,利用训练好的网络对Ｑ２３５钢在试验用水中的腐蚀进行了预测,误差较小,方法可行,同时,对影响Ｑ２３５钢的腐蚀因素进行了研究,找出了影响腐蚀的几种主要因素。     

Q235钢的离子氮碳共渗-低温盐浴渗铬复合处理

研究了Ｑ２３５钢的离子氮碳共渗－低温盐浴渗铬工艺,。试验表明,Ｑ２３５钢经离子氮碳共渗－低温盐浴渗铬复合处理后,表层可获得氮碳铬化合物和氮碳为化合物的复合渗层。该复合渗层具有较高的硬度,并且明显提高Ｑ２３５钢的耐蚀性。     

钢的直接电加热快速渗铝研究

本文通过钢的直接电加热快速渗铝工艺试验，研究了Ｑ２３５钢渗铝层的生长规律、组织组成、渗层铝浓度分布状态和硬度分布状态，并与１Ｃｒ１８Ｎｉ９Ｔｉ钢作了比较。结果表明，直接电加热快速渗铝工艺能大大缩短渗铝周期，具有高效节能的效果。     

小方坯铸机高效化改造后铸坯质量及其影响因素

本文对首钢第二炼钢厂２号方坯铸机经高效化改造后的生产、工艺条件，给出了浇注Ｑ２３５和２０ＭｎＳｉ钢的合理过热度及温度控制，从而获得低倍质量较好，中心等轴晶率较高的铸坯，并对当前条件下的Ｑ２３５钢和２０ＭｎＳｉ钢的低倍质量进行了对比。     

普碳钢直缝焊管焊缝金相组织分析

在Ｑ２３５Ｂ钢高频焊管压扁试验中，对合格与不合格试样的焊缝、母材金相组织进行分析比较，并对焊缝区金相组织的形成原因及其与焊接工艺的关系进行了分析。     

盐酸介质中脱氢松香基咪唑啉缓蚀剂对Q235钢缓蚀性研究

利用静态失重法测定了脱氢松香基咪唑啉系缓蚀剂在盐酸介质中Ｑ２３５碳钢的缓蚀速度和腐蚀效率。研究Ｑ２３５钢在盐酸介质中的腐蚀动力学特征,求出了腐蚀速度方程及相关动力学参数。结果表明,作为一种吸附型有机缓蚀剂,脱氢松香基咪唑啉在盐酸中对Ｑ２３５钢具有较强的缓蚀能力,且缓蚀效率随温度升高而增大。     

高浓度渗碳与耐火砖成型模板的选材

分析了 Ｑ２３５ 钢和１０ 钢制耐火砖成型模板过早失效的形式和原因。采用２０ Ｃｒ Ｍｏ 钢代之制作模板,并适当降低渗碳温度,可实现高浓度渗碳。生产试验表明,２０ Ｃｒ Ｍｏ 钢制模板的使用寿命是 Ｑ２３５ 钢和１０ 钢制模板的３～４ 倍。     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.     

INTRODUCTION TO PATENTS

The invention provides a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition. The method has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less.     

China Foundry Week 2014

China Foundry Week, hosted by the Foundry Institution of Chinese Mechanical Engineering Society （FICMES） each year, is a large academic event in China. It is one of the ten high-impact activities sponsored by the Chinese Mechanical Engineering Society.     

17th Conference of Hydrodynamic and Electromechanical Control Engineering Call for papers

正1.Contents In order to promote the academic exchanges and technical communication of the research in the field of fluid power transmission and control,fluid control engineering specialized committee of the Chinese Society of Theoretical and Applied Mechanics will hold the 17th Conference of Hydrodynamic and Electromechanical Control Engineering on July 27-29,2014 in Tibet,Lhasa city.     

Formulas of Tension of Continuous Rolling Process

The development of computer controlled continuous rolling process calls for a mathematical expression that can express the inequality condition of "constant flow". Tension is the link of the continuous rolling process. From the condition of dynamic equilibrium, a differential equation of tension is given out. On the basis of the physical rules established from the industrial practice and experimental studies, the law of volume constancy, the linear relation of forward slip and tension, the state equation of continuous rolling, the formula of dynamic tension, and the formula of static tension have been obtained. These formulae reflect the functional relations between tensions, thickness, roll velocity, and time in the continuous rolling process. It is implied that the continuous rolling process is a gradually steady, controllable, and measurable dynamic system. An assumption of predicting the thickness of a steel plate using these tension formulae is also put forward.