硅钢极薄带三次再结晶退火过程中的组织演化

采用异步轧制方法将成品工业取向硅钢板冷轧到0.10mm,然后在氢气热处理炉中进行三次再结晶高温退火,研究异步轧制硅钢极薄带退火过程中的再结晶过程.结果表明,硅钢极薄带在800℃退火时发生初次再结晶,晶粒取向主要为高斯取向,磁感低;900℃时初次再结晶中极少数晶粒突然长大而发生二次再结晶,对0.1mm的极薄带不能形成完善的高斯织构,磁性能下降;在1200℃时在合适的退火条件下可以发生三次再结晶,在极薄带中获得了取向集中的高斯织构和优异的磁性能.     

高纯铝箔在异步轧制和再结晶过程中取向的演变

采用不同速比的异步轧制技术对99.99%的高纯铝板进行不同形变量的冷轧,并对冷轧样品进行不同温度和时间的再结晶退火.利用X射线衍射技术和TEM观测探讨了异步轧制条件下高纯铝箔中变形织构和再结晶织构的演变.结果表明:高速比的异步轧制(i=1.28)在样品中产生相对较强的旋转立方织构{001}(110).异步轧制后退火的高纯铝箔样品中,立方{001}(100)织构组分的再结晶晶核的形成和长大存在一个临界转变温度,此温度与异步轧制的速比成反比.异步轧制有利于降低高纯铝箔的再结晶温度,这与异步轧制提高高纯铝箔的形变储能有关.异步轧制有利于在低温时形成强的立方{001}(100)织构组分,但此时漫散较大;随着退火温度的升高,漫散范围明显缩至8°-10°.     

异步轧制速比对高纯铝箔织构转变的影响

采用不同速比对高纯铝板进行异步冷轧,并将冷轧样品进行不同温度和时间的再结晶退火,研究异步轧制速比对高纯铝箔织构转变的影响。结果表明:高速比的异步轧制在样品中产生较强的旋转立方织构和{102}〈uvw〉织构,异步轧制退火后的高纯铝箔样品具有很强的立方织构{001}〈100〉。立方织构的体积分数与速比和温度有关:当速比为1.06时,温度升至300℃开始出现立方织构;当速比为1.17时,温度升到200℃就出现立方织构。立方织构组分的形成存在一个阈值温度,此温度与异步轧制的速比成反比,随着速比的增加,阈值温度逐渐降低,这与异步轧制提高高纯铝箔的形变储能有关。异步轧制有利于在低温时形成较强的立方{001}〈100〉织构。     

轧制方向对Fe-3％Si合金织构演变规律的影响

形成锋锐的Goss织构是取向硅钢获得优异磁性能的关键, 初始样品表层中较强的Goss织构对最终的强Goss织构起重要作用. 本文通过改变硅钢冷轧方向获得不同的初始织构及初始组织, 考察热轧板表层及中心层不同的组织及织构的进一步变化对一次冷轧、中间退火、二次冷轧及脱碳退火、二次再结晶退火后的织构及组织变化规律的影响. 探讨了这些特殊方式制备的样品中Goss织构的形成条件. 结果表明, 强烈的初始组织及织构的差异随轧制及退火次数的增多逐渐消失; 最终二次再结晶都可顺利进行, Goss织构及磁性能差异并不大. 虽然初始样品中Goss织构的强弱差异很大, 但因各阶段都可以形成较强的 {111}<112>织构, 弥补了初始样品中Goss织构过弱的不足, 因此轧制方向及初始组织都对最终的织构影响不大. 研究还证实了立方织构的遗传性; 横向轧制是消除稳定的{112}<110>轧制织构的有效方法.     

O8AI钢板异步退火织构的研究

本文以试样分层织构定量技术为主要判断依据,研究了异步轧制各种工艺参数、速比、张力、形变量和退火温度对08Al钢冷轧板经退火后织构的影响。结果表明:异步轧制退火织构与普通轧制退火织构无本质的区别,但仍有其独特规律性。为得到尽可能多的{111}退火织构,文中在原冷轧工艺的基础上又推荐了一比较适宜的退火工艺。     

退火时间对异步轧制无取向硅钢再结晶织构与磁性的影响

对高牌号无取向硅钢进行异步轧制,然后在不同时间下进行再结晶退火,研究异步轧制条件下高牌号无取向硅钢再结晶织构随退火时间的演变过程,探讨高牌号无取向硅钢再结晶织构的形成及再结晶织构组分与磁性的关系。结果表明:在750℃再结晶退火过程中,随着退火时间的延长,α织构强度减弱,织构组分逐渐向{111}〈112〉附近聚集,铁损逐渐下降。快慢辊侧再结晶织构类型基本相同,但慢辊侧强度高于快辊侧。     

异步轧制速比对3%硅钢织构转变的影响

采用不同的速比对取向硅钢进行异步冷轧,并在常规的生产条件下进行退火,研究速经对织构转变的影响。结果表明;速比对冷轧样品的表面及靠近快速辊侧的区域影响较小,但对心部的影响较大;速比的增加有利于样品两侧亚表层及心部织构组态的改善;     

二次冷轧中间退火对基于CSP工艺的取向硅钢组织及织构的影响

在实验室模拟CSP工艺条件下制备了取向硅钢,研究了二次冷轧中间退火工艺对组织和织构的影响。结果表明,中间退火温度对取向硅钢脱碳,高温退火组织及织构均产生明显影响。经940 ℃中间退火后,取向硅钢脱碳再结晶晶粒较850 ℃中间退火的多,且再经高温退火处理后,晶粒粗化,最大晶粒尺寸达4.8 mm;高斯织构组分密度达27.00,较850 ℃中间退火试样高。     

退火对异步轧制高纯铝箔织构的影响

利用取向分布函数(Orientation Distribution Functions)分析和反极图定量计算，探讨了1异步轧制下，高纯铝箔织构的形成和发展?结果表明，适宜的轧辊速比，相应的形变量和与之相匹配的退火工艺，是获得强立方织构(100)[001]的前提。当轧辊速比为1．28、形变量为96．7％时，在600℃退火后，立方织构的体积分数高达96．65％。     

异步轧制对高纯铝箔冷轧织构的影响

通过异步轧制，对高纯铝箔微取向流变行为进行了研究，结果表明，异步轧制与同步轧制的冷轧织构有较大差异，高纯铝箔在异步轧制下慢辊和快辊两侧的织构类型明显不同，尤其是旋转立方织构{001}{110}在含量上的差异更大，快辊侧随形变量的增中冷却织构主要为：S织构和{102}{uvw}织构，而慢辊侧则主要为：旋转立方织构{001}{110}，慢辊侧的旋转立方织构在相同的速比、相同的形变量下一般要大于快辊侧的旋转立方织构。     

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.     

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.     

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.     

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.