含Mo微合金钢的析出行为     

苑少强  王春  梁国俐  刘义 《唐山学院学报》2008,21(4)

运用热模拟技术,硬度测量及透射电镜(TEM)观察,研究了简单成分的含Mo微合金钢的析出行为。结果表明:含Mo0.33%时,Mo在奥氏体变形后弛豫没有析出产生;在525℃时效过程中形成硬度峰,Mo在Δ基体中发生沉淀。Mo与微合金元素Nb存在较强的相互作用。  相似文献   

一起因硬度指标改变导致自来水水质异常的调查报告     

高正佳 《山东商业职业技术学院学报》2006,6(3):95-96

对水源水和末梢水供水系统布点采样，按照GB 5750-85生活饮用水标准检验方法进行检验；结果显示因供水水源的更换，新供水系统总硬度指标显著变化，导致口感差异；因此，加强集中式供水水质监测，及时掌握水质动态，对于保障饮水安全非常必要。  相似文献   

固体硼铬稀土共渗组织与性能研究     

王娟  吴正策 《连云港职业技术学院学报》2004,17(2):37-38

应用光学显微镜、显微硬度计和分析天平，研究了45钢在固体硼铬稀土共渗后的组织和性能。结果表明：硼铬稀土共渗改善了渗层组织，而且温度、保温时间、稀土浓度的变化对渗层组织都有较大的影响。  相似文献   

木石前盟·骨骼意象·天涯美学——论洛夫诗歌的精神硬度     

田崇雪 《徐州师范大学学报(哲学社会科学版)》2007,33(3):58-64

洛夫诗歌有一种贵族之气和金石之声,这是一种精神的硬度,一种基于情感浓度和思想深度之上的精神硬度。它具体呈现于“木石前盟”、“骨骼意象”和“天涯美学”三个层面。“木石前盟”指的是沉淀于诗人潜意识当中的“木”“石”情结,具体表现为《石室之死亡》和《漂木》两部长诗,一前一后,里程碑式地矗立于洛夫60年的创作历程当中。而“木石前盟”于洛夫的诗歌还有着“自然的情愫”、“经典的造型”和“矛盾的辨证”三重象征。“骨骼意象”则是“木石”意象的延伸、衍生和变异,最形象地体现着洛夫诗歌的的精神硬度。“木石前盟”和“骨骼意象”一天一人共同支撑起洛夫自觉的精神追求:“天涯美学”。这也正是洛夫作为一个诗人的深刻之处:有着高于一般诗人的特有的理想和信仰,同样体现着一种精神硬度。  相似文献   

对工业用水总硬度测定异常现象的研究     

朱桂琴 《河北北方学院学报(社会科学版)》2002,18(6):60-62

在工业用水总硬度测定中经常出现“返红”现象 ,通过实验研究了出现返红的原因及解决的方法  相似文献   

高校联合实验室——罗克韦尔实验室建设实践     

徐荣华  王钦若  宋亚男 《实验室研究与探索》2010,29(4)

在课题组工作实践基础上,介绍了罗克韦尔实验室建设的各项举措,探讨了联合实验室建设的方法.  相似文献   

定西市城区居民饮用水硬度分析   总被引：1，自引：0，他引：1  

赵明 《甘肃高师学报》2010,15(5):25-27

水是人类赖以生存的重要条件,也是人体的重要组成部分,因此饮用水的硬度与人体的健康关系极为密切.水的硬度是指溶解在水中的盐类物质的含量,即钙盐与镁盐含量的多少,它是表示水质的一个重要指标.钙、镁离子的质量总和相当于10mgCaO或7.19mgMgO称之为1"度(°)".8度(°)以下为软水,8~16度(°)为中水,16度(°)以上为硬水,30度(°)以上为极硬水.硬度又可分为暂时性硬度和永久性硬度,暂时性和永久性硬度之和称为总硬度.本工作采用EDTA法对定西市城区居民饮用水的硬度进行了测定分析.经测定,定西市城区居民饮用水的总硬度为10.40度,永久硬度为7.00度(°),暂时硬度为3.40度(°).按照水的硬度标准(钙、镁离子的质量总和相当于10mgCaO称之为1"度(°)")划分,定西市城区居民饮用水属于中硬水.  相似文献   

Surface hardness of a cricket bat after ‘knock-in’     

Prof. A. T. Sayers  M. Koumbarakis  S. Sobey 《Sports Engineering》2005,8(4):233-240

New cricket bats need to be ‘knocked in’ prior to use, but just what this process does to the surface fibres of the bat is unknown and unquantified. One quantitative measurement of knock-in is the resultant surface hardness of the bat, and this paper describes knock-in tests to determine the surface hardness following differing durations of knock-in. The design of a cricket bat knock-in machine is first described. This takes the form of a cradle in which a cricket bat can be secured horizontally and then traversed at constant speeds in two mutually perpendicular directions while at the same time being struck with constant force by a cricket ball. The traverses are driven by lead screws, the motors of which can be independently switched on or off. The traverse distance can be varied with adjustable limit switches and relays that reverse the direction of rotation of the lead screws when activated. The cricket ball is attached to a rod that is lifted cyclically by a cam against a coil spring extension, and then allowed to fall under that force to impact on the bat surface. The impact (knocking-in) force was measured by a previously calibrated strain gauge attached to the rod holding the cricket ball. By judicious setting of the limit switches, selected areas of the bat surface were continuously knocked in for periods varying from 1 to 4 hours. After knocking in, the surface hardness was measured in accordance with British Standard 373 using a penetrator designed in accordance with the same standard. Analysis of the load/penetration curves shows an increase in surface hardness with knock duration. Photographs of the cell structure of the surface wood, obtained using a scanning electron microscope, show that under knock-in conditions, the wood cells collapse to form a mesh-like hardened layer which increases in hardness with increase in knock-in duration.  相似文献   

Zr_(52．5)Al_(10)Ni_(10)Cu_(15)Be_(12．5)大块金属玻璃的高温宏观硬度     

LI Jun TIAN Rui XIAO Xue-shan School of Materials Science  Engineering  Shanghai University  Shanghai  P.R.China 《上海大学学报(英文版)》2007,(5)

The hot hardness behavior of Zr_(52.5)Al_(10)Ni_(10)Cu_(15)Be_(12.5) bulk metallic glass is studied from ambient temperature to the temperature over T_x (the onset crystallization temperature) using a hot macro-hardness tester and scanning electron microscopy (SEM).The results show that the hot hardness behavior of Zr_(52.5)Al_(10)Ni_(10)Cu_(15)Be_(12.5) bulk metallic glass can be classified into 4 zones:the glassy zone in which the hardness almost linearly decreases with the increase of temperature,the viscoelastic zone in which the hardness is nearly unchanged,the viscous flow zone in which the hardness quickly tends towards near zero with temperature,and the crystallization zone in which the hardness sharply increases.The high temperature deformation behavior and the easy processable deformation region for bulk metallic glasses are also discussed on the basis of the hot marco-hardness.  相似文献   

EDPCrMoV-A2-15和EDRCrMoWV-A1-03堆焊组织和硬度分析     

陈玲  王非森  文申柳 《宜宾学院学报》2011,(6):92-95

分别采用EDPCRMOV-A2-15和EDRCRMOWV-A1-03焊条对Q235低碳钢板进行堆焊,分析其堆焊显微组织、硬度及硬度变化的原因.结果表明:用焊条电弧焊堆焊EDPCRMOV-A2-15和EDRCRMOWV-A1-03时,第一层受到母材的稀释作用,硬度变化比较明显,第二层和第三层硬度变化较小,第二层硬度出现峰值,第三层基本可以反应熔敷金属的硬度.得出EDPCRMOV-A2-15和EDRCRMOWV-A1-03焊条堆焊层金属主要为马氏体,其硬度值的大小与显微组织和焊条合金元素的含量有关.  相似文献