减振复合钢板的成形性及其数值模拟研究进展

减振复合钢板是一种应用于汽车覆盖件方面的新型材料，有利于减振和减轻重量。介绍了其成形性和成形过程数值模拟的研究进展，并对未来发展进行了展望。     

双面复合不锈钢冷轧薄板成形性研究

全面测量和分析了冷轧不锈钢复合钢板的成形性,结果表明:复合钢板成形性略低于基板成形性。影响复合钢板成形性的主要因素是基板晶粒太细,基板中{111} 退火织构组分太少。因此,这种冷轧复合薄板只能用于一般深冲成形,而不适用于深拉延成形。     

搪瓷钢的涂搪性研究

搪瓷层鳞爆是搪瓷钢板的常见缺陷。对Ti、V复合微合金化的低碳搪瓷钢板进行了不同压下量的轧制成形和不同温度的退火处理,研究材料再结晶状态及析出物和夹杂物分布对搪瓷层鳞爆及其与基体密着性的影响。试验结果表明,压下量和退火温度对搪瓷层与基体的密着性没有明显的影响,但对抗搪瓷鳞爆性有明显影响,完全再结晶和弥散分布的夹杂物有利于提高搪瓷钢板的抗鳞爆性能。     

层压减振复合钢板减振性能的温度依存性

用正弦扫描激励法测定和计算了层压减振复合钢板的幅频特性曲线和结构损耗因子。结果表明，用酚醛树脂氯丁橡胶作夹层的层压减振复合钢板，在２０─１５０℃温度范围内具有良好的减振性能，其结构损耗因子在０．０５以上，最大可达０．３５．     

差厚贴合减振钢板成形性的数值模拟研究

采用有限元软件MSC．Marc基于更新拉格朗日的弹塑性本构方程，对减振钢板的拉深变形进行了数值模拟。模拟得出了变形过程中的应力应变状态和错动量分布。通过改变内外两层钢板的厚度比，分析了差厚贴合对减振钢板拉深变形错动量的影响。为减振钢板的设计和应用研究提供了可靠的理论依据。     

层压减振复合钢板减振性能的温度依存性

用正弦扫描激励法测定和计算了层压减振复全钢板的幅频特性曲线和结构损耗因了。结果表明，用酚醛树脂氯丁橡胶作夹层减振复合钢板，在２０－１５０℃温度范围内具有良好的减振性能，其结构损耗因子在０．０５以上，最大可达０．３５。     

减振钢板及其生产方法

１前言减振钢板是近几年来日本等工业发达国家研制开发的一种新型复合板材。减振复合钢板与普通钢板相比，具有显著的消音、减振效果，这种优良的特性正是汽车、建材及家具追求轻型、节能、舒适、美观所需要的。因此近年得到迅速发展，尤其在汽车行业获得广泛的应用。近两年，我国也开始了树脂复合钢板的研究工作。目前，宝钢、中科院金属所、北京科技大学、东北大学等已在实验室条件下研制出减振钢板的样品。２　减振钢板的构成和特性减振钢板是由钢板－树脂－钢板组成的复合钢板。表层钢板厚度为０．３～１．６ｍｍ，中间高分子树脂采用呈…     

终轧温度对铁素体不锈钢织构和成形性的影响

在实验室研究了终轧温度对铁素体不锈钢显微组织、织构和成形性的影响。结果显示,随着终轧温度的降低(从940℃到800℃),冷轧退火板的组织细化,γ再结晶织构强度增加,平均塑性应变比r值增加,平面各向异性Δr值降低。终轧温度的降低显著改善了薄板的成形性能。     

镀锌钢板的深拉深性

以汽车为中心的冲压用防锈钢板表面与冷轧钢板大不相同。对防锈钢板,人们已细致观察到许多早存在于冷轧钢板冲压成形中的材料表面的潜在问题。本文以镀锌钢板深拉深成形中的滑动性和模具粘附问题为中心作二介绍。 1.各种镀锌钢板的深拉深成形性表1所示是试样主要特征,图1所示是镀锌钢板、深拉深性能和特性γ的关系。人们已经弄清,冷轧钢板深拉深性和γ值之间存在着密切对应关系。可是与此相反,有的镀锌钢板却脱离了这种对应关系。就是说,镀锌钢板深拉深性不象冷轧钢板那样可以只用γ值作标准。且镀锌钢板深拉深性与γ值不相对应的关系还不仅取决于电镀种类。     

减振钢板基本成形性研究

树脂复合减振钢板是一种应用于汽车、机械及家电的新型材料。本实验研究了宝钢生产的减振钢板的基本性能及特有性能     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

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 Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

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.