Al含量对Ti1-XAlXN涂层组织结构的影响

通过不同Al含量的Ti—Al粉末冶金靶．采用多弧离子镀技术制备了Ti1-xAlxN涂层。用SEM、XRD、GAXRD以及XTEM等手段研究了Al元素对涂层组织结构的影响。研究表明，TiAlN涂层呈柱状多晶组织，(Ti，Al)N为涂层的主要组成相；随着Al含量的增加。涂层中的(Ti，Al)N相减少，且其晶格常数降低。     

Influence of malt on the xanthohumol and isoxanthohumol behavior in pale and dark beers: A micro-scale approach

The main objective of this work was to understand which compounds are responsible for the partial inhibition of xanthohumol (XN) thermal isomerization during wort boiling of dark malts. With such purpose, worts from different kinds of malt (pale, caramel and roasted) were chemically characterized (e.g. antioxidant activity, polyphenols and melanoidins contents) and studied by several chromatographic techniques. Molecular exclusion chromatography experiments showed that adsorption of XN to polyvinylpolypyrrolidone is lower for the high molecular weight fractions. It seems likely that this is due to the reaction between XN and coloured substances that changes chemical properties of XN or, at least, results in the formation of complexes that have different chemical properties. This leads to an inhibition of XN isomerization observed in this work. It was also verified that the melanoidins content was significantly higher in the higher molecular weight fractions, suggesting that probably these compounds are the main responsible for the XN isomerization inhibiting effect.     

超级奥氏体不锈钢AL-6XN在超临界水中的腐蚀行为

研究了超级奥氏体不锈钢AL-6XN在500℃,550℃和600℃/25 MPa超临界水中的腐蚀行为,通过扫描电镜-电子能谱(SEM-EDX)、X射线衍射(XRD)和X射线光电子能谱(XPS)分析了氧化膜的显微形貌、组织结构与成分分布。结果表明,氧化膜为双层结构,氧化膜中含Fe₃O₄, Cr₂O₃,Fe₂O₃和FeCr₂O₄相。AL-6XN在超临界水中氧化膜存在脱落现象,脱落程度随温度升高而加剧。     

AL-6XN合金在超临界水中的应力腐蚀研究

采用慢拉伸试验研究了AL-6XN合金在550~650℃、25 MPa超临界水中的应力腐蚀行为,使用扫描电镜观察了材料断口形貌与标距面裂纹分布。结果显示:550℃试验条件下材料表现为穿晶开裂,标距面裂纹很多且分布较均匀,试样边角处出现扇形河流花样;650℃试验条件下材料表现为沿晶开裂,断口呈现典型的冰糖状,标距面裂纹数量大幅减少且集中于断口附近,相应的延伸率和断面收缩率也大幅降低。质子辐照对AL-6XN宏观力学性能影响不大,但导致试样断口的扇形花样(起裂源)数量增加,解理台阶宽度增大。以上结果表明,AL-6XN在超临界工况下具有严重的应力腐蚀开裂敏感性,升高温度和质子辐照会明显提高材料的应力腐蚀敏感性。     

The Influence of Centerline Sigma (σ) Phase on the Through-Thickness Toughness and Tensile Properties of Alloy AL-6XN

The J-integral fracture toughness and tensile behavior of AL-6XN (ATI Properties Inc., Pittsburgh, PA, USA) plate material in the short-transverse (S-T) orientation was studied. The material was tested with respect to the presence or absence of microstructural ‘packets’ of brittle sigma phase (σ-phase) particles within the austenite matrix, located near the centerline of the plate. The J-integral-fracture resistance curve (J-R-curve) qualitatively indicated that the presence of the σ-phase packets is a detriment to the fracture toughness of the material in the S-T orientation. Tensile specimens containing the packets of σ-phase particles exhibited reduced yield and tensile strengths as well as pronounced reduction in ductility compared to specimens nominally free of σ-phase packets. Particle cracking was observed within the σ-phase packets, which lead to premature fracture. This limited the ability of the material to plastically deform and work-harden, thereby accounting for the observed reductions in ductility, toughness, and ultimate tensile strength.     

GXN: Building Networks for Collaborative Research on Materials in Architecture

Kasper Guldager Jørgensen, Head of GXN at Danish practice 3XN , explains the vision behind the internal research group that investigates ecological design through digital processes and innovative material solutions. With a developed network of specialists, this relatively small group is able to draw on a much wider field of disciplines in its collaborations, whether it is working on an urban environmental project or contributing to materials studies with manufacturers and educational institutions. Copyright © 2011 John Wiley & Sons, Ltd.     

XN型耐振线夹在网改工程中的应用

以大同市城网改造为例,围绕电网改造,阐述XN型悬垂耐振线夹这项新材料、新工艺、新技术应用于输电设备上,使电网结构更科学合理,施工高效省时,运行更安全稳定,具体介绍了XN型悬垂耐振线夹的性能特点,并举出应用实例。     

一种新型奥氏体不锈钢的塑性流变行为研究

在起始实验温度从77K到1000K,应变率从0.001/s到8300／s,并且使真实应变超过40％条件下,对一种新型的氮增强奥氏体不锈钢（AL6－XN)进行了大量的单轴压缩实验,结果表明,这种材料在77K低温下的真实应变可以达到40％,并且它的韧性随着温度增加将会进一步显提高;绝热剪切带或剪切破坏发生在大约296K温度以下;在较高温度下,明显的温度依赖性减弱反映其良好的焊接性能;动态应变时效发生在准静态及温度500K到1000K之间。最后,一个发展的Johnson-Cook本构模型,在不考虑动态应变时下被成功的用于预测这种AL6－XN的流变应力。     

AL - 6XN超级不锈钢与Q345R钢复合钢板工艺试验

采用爆炸焊接法对AL-6XN超级不锈钢与Q345R钢进行焊接,对复合钢板进行消除爆炸应力热处理。为保证焊接接头力学性能和耐蚀性能,复合钢板过渡层和覆层选用不同焊接材料和焊接方法进行试验,并对不同热处理温度下的复合钢板力学性能和耐蚀性能进行测试分析。结果表明,AL-6XN+Q345R复合钢板宜选择中温消除爆炸应力。复合钢板焊接工艺制定时,其过渡层和覆层应优先采用ERNi Cr Mo-3的氩弧焊工艺,以满足设备制造技术要求。