铝-钢复合板结合界面研究

用显微硬度计、透射电镜、扫描电镜及能谱仪对铝-钢复合板结合界面进行了研究.结果表明,铝-钢复合板结合界面呈准正弦波形;结合界面两侧的铝元素和铁元素相互扩散,扩散的深度在微米数量级,爆炸后结合界面显微硬度增加,漩涡区的硬度增加为基体金属的3-6倍;结合界面由铝和铁的金属间化合物(FeAl、FeAl2、FeAl3、Fe24...     

铝/钢爆炸复合界面的显微分析

通过金相显微镜与电子探针对铝/钢复合板的界面进行了显微分析.结果表明,铝、钢爆炸复合过程中不易形成波状界面,复合界面呈平直状,界面处金属发生了冶金反应;爆炸焊接过程中,铝/钢复合界面处的基体金属发生了熔化,界面处的晶粒发生了严重的塑性变形,并且在铝/钢直接结合的界面两侧存在着距离约为5μm的扩散.分析认为爆炸焊接的工艺特点及铝、钢的物理性质决定了铝/钢界面的显微特点.并据此探讨了影响铝/钢复合强度的因素.     

铝合金-钢爆炸焊接装药量与界面性能的关系(英文)

通过设计不同的爆炸焊接工艺参数爆炸复合了铝合金-钢爆炸复合板,并对复合板的界面性能进行了显微分析和力学性能测试,探讨了爆炸焊接装药量对复合板界面性能的影响。结果表明:在铝合金-钢复合板的的结合界面产生了一层金属间化合物并且在化合物中产生了许多微裂纹。随着装药量的增加,界面化合物的厚度略有增加,其上微裂纹的的数量也有所增加。复合界面的剪切强度随着装药量的增加而有所降低。界面化合物对复合板强度产生不利影响,铝合金-钢爆炸焊接时应尽量采用小药量。     

917低磁钢与铝合金爆炸焊接复合实验研究

采用异种金属爆炸焊接复合技术，研制了917低磁钢与LF5、LF21、LF11等铝合金的爆炸焊接复合反，并对该铝－钢复合板力力学性能进行了实验研究，对复合界面进行了金相分析，实验结果表明，该铝－钢复合板合复界面物理结合良好，其抗剪和抗弯强度满足实船使用要求。     

铝-钢爆炸焊接试验与分析

介绍了一种铝-钢复合板爆炸焊接工艺，包括所采用的炸药、复合板的性能和爆炸焊接材料的准备等。采用了金相技术、电子探钳和电子显微镜物相鉴定手段以及力学性能分析．结果显示．该复合板的结合区存在着金属强烈的塑性变形、熔化和原子间的相互扩散等冶金过程；铝-钢复合板是一种具有特殊使用性能的新型结构材料．具有很高的经济效益和广泛的应用前景。     

Pb1-Q245R爆炸焊接复合板结合界面研究

采用电阻测量装置、金相显微镜、透射电镜对爆炸焊接铅-钢复合板结合界面进行了研究.结果表明,铅-钢复合板结合界面导电性能优越;界面结合形态呈准正弦波形,无漩涡区;结合界面两侧的铅元素和铁元素相互扩散,钢侧铅含量降低较快,铅侧铁含量降低较慢,扩散的深度在微米数量级;结合界面组织由铁微晶与铅微晶混合组织组成.     

烟囱钢内筒钛-钢复合板焊接浅析

钛-钢复合板:用爆炸或爆炸-轧制方法使钛(复材)与普通钢(基材)达到冶金结合的金属复合板。目前,电力建设中烟囱内筒基本采用钛-钢复合板设计方案。本文对钛-钢复合板加工、焊接时存在的难度和特殊性比较全面地叙述。分析了焊接产生的缺陷和处理方法,对坡口形式、焊材选择、气体保护措施及清洁措施进行了详细说明。     

铝-钢爆炸复合板的研究

进行了三种质量比的铝－钢爆炸复合板试验,所有复合板界面焊合良好,焊合率〉９５％,结合强度〉６０ＭＰａ,而且基,复层材料对爆炸冲击波响应的硬化程度不明显,但结合界面存在铁,铝金属间化合物,故复合时应仔细选择爆炸参数,昼减少其生成量。     

爆炸-轧制钛/钢复合板界面结合性能研究

爆炸-轧制法是先通过爆炸复合制坯,再进行轧制生产复合板的一种方法。本文研究了爆炸-轧制法生产的钛/钢复合板的界面金相、结合界面的元素分布情况以及退火温度对界面结合强度的影响等问题,结果表明:爆炸轧制法生产的钛钢复合板的界面近似呈平直状,在界面钢侧有一脱碳层,引起界面附近碳元素的重新分布,对结合性能有重要影响;获得高强度结合的界面特征是:剥离界面钢层上的Ti元素含量在一定范围内,钛层大量粘铁;退火温度对界面的结合强度影响较大,而在相应保温下保温时间影响不明显。     

T2纯铜/2024铝合金爆炸焊接接头界面结构及性能

为研究铜铝异种金属爆炸焊接头界面形成机理,采用爆炸焊对T2纯铜和2024铝合金进行了焊接.通过光学显微镜、扫描电镜、X射线衍射、万能材料试验机和纳米压痕仪,对T2/2024复合板结合界面的显微组织、成分分布和力学性能进行了测试分析.结果表明:T2/2024合金爆炸复合板结合界面呈波状结合,结合界面主要由平直界面、波状界面和局部熔化层界面构成;靠近结合界面处,基体金属发生塑性变形,晶粒细化;反应层主要成分为AlCu和Al_2Cu的混合物.复合板拉剪试验表明,T2/2024合金爆炸复合板平均结合强度为67 MPa,纳米压痕测试反应层平均硬度可达8 GPa.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.     

新闻(英文)

正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to     

Win-Win Cooperation

正The Chinese Premier Li Keqiang's recent trip to the UK has reinforced the China-UK comprehensive strategic partnership;just as the British Prime Minister David Cameron put it,"the relationship is gaining in strength,depth and understanding"after a bucket of business deals being inked worth more than 30 billion US dollars.From the first agreement signing in 2004 to the new agreement of mutual standards recognition and adoption in     

Systematic Approach for Emerging Industry

正A national directory of standards complexes for strategic emerging sectors was recently developed and released jointly by 12governmental departments,namely,SAC,NDRC,MOST,MIIT,MEP,MOA,AQSIQ,State Forest Administration,State Administration of Science and Technology for National Defense,State Oceanic Administration and National Railway Administration.     

Strictest Pollutants Emission Standards

正Four new national standards on air pollutant emission control offi cially issued by the Ministry of Environment Protection(MEP)together with AQSIQ and SAC has been brought into force from July 1,2014.The Emission standard for air pollutants of coal-burning,oil-burning and gasfi red boilers,which is the strictest emission standard historically,will tackle the stubborn pollution problem of boilers and waste incineration in most of China’s regions.     

Instructions to Authors

New Carbon Materials is a bimonthly journal published with the permission of the Ministry of Science and Technology and of the State News and Publication Agency.The journal is sponsored by the Institute of Coal Chemistry,Chinese Academy of Sciences,and is published by Science Press.Aims and Scope     

Progress on Standards Copyright Protection

正Recently,National Copyright Administration of China(NCAC)has rewarded 215 organizations and 179 individuals for their outstanding efforts on investigating standards copyright infringement and piracy in 2013.Hua Jianhua,the Deputy-Director of National Standards Copyright Protection Workgroup Office won a third prize of the national individual award.In 2012,SAC set up the national standards copyright protection working group,and developed policies to crack down standards infringement and piracy behaviors and to strengthen standards copyright protection.