RS高强Al－Zn－Mg－Cu系合金热处理温度与性能的关系

本文系统研究了ＲＳ高强Ａｌ－Ｚｎ－Ｍｇ－Ｃｕ系合金淬火温度、时效温度与性能关系，同时还分析了合金的微观组织。试验得出在４７０℃淬火峰时效（Ｔ６）的拉伸性能达到σ_ｂ＝７４０ＭＰａ，σ_（０．２）＝７０２ＭＰａ，δ_５＝１０％；双级时（Ｔ７３）可获得σ_ｂ＝６３３ＭＰａ，σ_（０．２）＝６０６ＭＰａ，δ_５＝１１．５％。合金的弥散强化相是Ｃｏ_２Ｎ_９、Ａｌ_３Ｚｒ，沉淀强化相为ＧＰ区、η＇和η。     

RS高强Al－Zn－Mg－Cu系合金热处理温度与性能的关系EI

本文系统研究了ＲＳ高强Ａｌ－Ｚｎ－Ｍｇ－Ｃｕ系合金淬火温度、时效温度与性能关系，同时还分析了合金的微观组织。试验得出在４７０℃淬火峰时效（Ｔ６）的拉伸性能达到σ_ｂ＝７４０ＭＰａ，σ_（０．２）＝７０２ＭＰａ，δ_５＝１０％；双级时（Ｔ７３）可获得σ_ｂ＝６３３ＭＰａ，σ_（０．２）＝６０６ＭＰａ，δ_５＝１１．５％。合金的弥散强化相是Ｃｏ_２Ｎ_９、Ａｌ_３Ｚｒ，沉淀强化相为ＧＰ区、η＇和η。     

双甲基丙烯酰氧基聚乙二醇与甲基丙烯酸盐共聚及导电性

在合成α，ω－双甲基丙烯酰氧基封端的聚乙二醇（ＢＭＡＰＥＧ）的基础上，通过ＢＭＡＰＥＧ与甲基丙烯酸盐（ＭＡＡＭ）共聚，制备了离子导电率（σ）在３０℃时为４．０×１０－６Ｓ／ｃｍ的单离子传导的ＡＢ交联型聚醚类固体电解质（ＡＢＣＰＥ）。研究了影响ＡＢＣＰＥ离子导电率的因素。结果表明，用甲基丙烯酰氯与聚乙二醇进行酯化反应可以合成所期望结构的ＢＭＡＰＥＧ。ＡＢＣＰＥ的σ随ＰＥＧ链段长度和共聚单体浓度的增加出现最大值；降低ＢＭＡＰＥＧ的双键官能度，或升高温度，σ升高。     

超高压处理HDPE的微硬度及DSC研究

用维氏微硬度测定仪和ＤＳＣ对超高压自理的ＨＤＰＥ进行了研究。发现随着处理压力的增大,ＨＤＰＥ的微硬度ＨＶ）提高,在处理时升高温度（ＴＣ）,更有利于ＨＶ的提高。当Ｐｃ＝４．０ＧＰａ,Ｔｃ＝１８０℃时,ＨＶ达最大值１７８．４ＭＰａ,比处理前的的７２．５ＭＰａ提高了１４６％,ＤＳＣ结果表明,ＨＤＰＥ经超高压处理后,结晶度增大,而且除了在１３２℃出现１个普通的强度较大的融吸热峰外,还在１３４℃处附近出现１     

DBM-g-PE与PVC的相互作用研究EI

采用固相接枝法制备了ＤＢＭ－ｇ－ＰＥ，用红外光谱分析证明了接枝物确实存在。ＰＶＣ／ＣＰＥ＝１００／５合金性能测定结果表明，添加５份接枝物的合金（Ａ），缺口冲击强度、拉伸强度分别为１８．２ｋＪ／ｍ２和５３．０ＭＰａ；而添加５份ＰＥ的合金（Ｂ），其相应性能为５．１ｋＪ／ｍ２和３３．８ＭＰａ。不加接枝物的合金（Ｃ），虽有高韧性，但拉伸强度却由５３．０ＭＰａ降至５０．２ＭＰａ。ＤＳＣ、ＳＥＭ的结果均表明，ＰＥ接枝ＤＢＭ后与ＰＶＣ的相互作用增强，与ＣＰＥ协同作用能增韧、增强ＰＶＣ，并探讨了其机理。     

文摘

文摘１３，５－二硝基苯甲酸与３，５－二硝基苯甲酸铝盐的分解热研究（英文）Ｃ９２３３１９０３ＲＥＤＤＹＧＯ，ＲＡＶＩＫＵＭＡＲＫＳ（ＩＤＬＣｈｅｍｉｃａｌｓＬｔｄ，Ｂａｎｇａｌｏｒｅ，ＩＮＤ）：Ｅ０３５０ＣＴｈｅｒｍｏｃｈｉｍＡｃｔａ（ＮＬＤ）１９８（...     

一种热解碳基1D—C／C的稳态蠕变

采用自制高温蠕变实验机构和蠕变数据自动测试系统考察了一种热解碳基１Ｄ－Ｃ／Ｃ的高温拉伸蠕行为，测得了描述蠕变行为的重要热激参数分别表现激活能Ｑ＝４２８．９６ｋＪ／ｍｏｌ（σ＝２１３．４６ＭＰａ，Ｔ＝２０１０～２１６０℃，应力指数ｎ＝２．９７（Ｔ＝２０１０℃，σ＝１３３．８３～２１３．４６ＭＰａ）以及表现激活体积Ｖ０＝１．０５９ｎｍ＾３，并初步分析了其蠕变机理。     

TECHNICAL AND ECONOMIC ASPECTS OF TUNNEL BLASTING ACCURACY CONTROL

ＴＥＣＨＮＩＣＡＬＡＮＤＥＣＯＮＯＭＩＣＡＳＰＥＣＴＳＯＦＴＵＮＮＥＬＢＬＡＳＴＩＮＧＡＣＣＵＲＡＣＹＣＯＮＴＲＯＬ￥ＲｅｎａｔｏＭＡＮＣＩＮＩ（）；ｖａｎｎｔＢＡＤＩＮ０（）；ＮｉｃｏｌａＩＮＮＡＵＲＡＴ０（＊）；ＭａｕｒｏＦＯＲＮＡＲ０（＊），Ｍ...     

以Ba云母为主晶相的可切削玻璃陶瓷

基于Ｂａ０．５Ｍｇ３（Ｓｉ３ＡｌＯ１０）Ｆ２－Ｍｇ２Ａ１４Ｓｉ５Ｏ１８－Ｃａ３（ＰＯ４）２系统，制备出了以含Ｂａ碱士云母为主晶相的可切削玻璃陶瓷，弯曲强度σｂ＝２２９ＭＰａ，断裂韧性Ｋｌｃ＝２．４８ＭＰ·ｍ１／２；钻孔速度大于７ｍｍ／ｍｉｎ．优良性能的获得借助于Ｂａ云母玻璃陶瓷可控的显微组织，即相互交错的云母体和“卷心菜”的组织特征．观察到了两类类型的断口形貌：云母晶体层内断的层状花样和沿（００１）晶面层间断的小刻面花样．     

固溶温度对OOCr26Ni8Mo3Ti不锈钢组织和力学性能的影响

对ＯＯＣｒ２６Ｎｉ８Ｍｏ３Ｔｉ不锈钢在不同固溶处理状态下的组织结构和力学性能进行了研究，试验结果表明，当固溶温度９５０～１０００℃时，由于组织有害σ相（ＴＣＰ）的存在，使其力学性能呈现出典型的σ相脆性特征，而固溶温度为１０５０℃时，合金的组织为Ｆ相（ｂｃｃ）＋Ａ相（ｆｃｃ），σ相消失，所以合金具有强度高，塑性，韧性好等优良的综合力学性能，当因溶温度分别为１１００℃和１１５０℃时，合金几乎为单相Ｆ组     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

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.……     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

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.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

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