MICROSTRUCTURAL OBSERVATIONS IN A SUPERPLASTICALLY DEFORMED Ti33Al3Cr0 .5 Mo ALLOY

１　ＩＮＴＲＯＤＵＣＴＩＯＮＲｅｃｅｎｔｌｙ,ｆｉｎｅｇｒａｉｎｅｄｓｕｐｅｒｐｌａｓｔｉｃｉｔｙｉｎＴｉＡｌａｌｌｏｙｈａｓｂｅｅｎｗｅｌｌｉｄｅｎｔｉｆｉｅｄ［１－４］,ａｎｄｗｅｈａｖｅａｌｓｏｒｅｐｏｒｔｅｄｔｈｅｓｕｐｅｒｐｌａｓｔｉｃｂｅｈａｖｉｏｕｒｏｆＴｉ３３Ａｌ３Ｃｒ０．５Ｍｏａｌｌｏｙａｔ１０００℃ａｎｄａｔｓｔｒａｉｎｒａｔｅｓｒａｎｇｉｎｇｆｒｏｍ２．０×１０－４～６．０×１０－４ｓ－１ａｎｄａｍａｘｉｍｕｍｅｌｏｎｇａｔｉｏｎｏｆ３０５％ｗａｓｏｂｔａｉｎｅｄｕ…     

CONTROLLING HIGHTEMPERATURE DEFORMATION BY VARYING MICROSTRUCTURE IN A Ti47Al2Cr2Nb ALLOY

１　ＩＮＴＲＯＤＵＣＴＩＯＮγＴｉＡｌａｌｌｏｙｓａｒｅａｔｔｒａｃｔｉｖｅｓｔｒｕｃｔｕｒａｌｍａｔｅｒｉａｌｓｂｅｃａｕｓｅｏｆｔｈｅｉｒｐｏｔｅｎｔｉａｌａｐｐｌｉｃａｔｉｏｎｓｉｎａｅｒｏｓｐａｃｅａｎｄａｕｔｏｍｏｂｉｌｅｉｎｄｕｓｔｒｉｅｓ［１］．ＣｕｒｒｅｎｔｒｅｓｅａｒｃｈｏｎγＴｉＡｌｉｓｐｒｉｍａｒｉｌｙｆｏｃｕｓｅｄｏｎｉｍｐｒｏｖｉｎｇｉｔｓｒｏｏｍｔｅｍｐｅｒａｔｕｒｅｄｕｃｔｉｌｉｔｙ,ｔｏｕｇｈｎｅｓｓａｎｄｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｃｒｅｅｐｒｅ…     

MARTENSITIC AND R PHASE TRANSFOR MATIONS IN NiTiand NiTiHf

１　ＩＮＴＯＤＵＣＴＩＯＮＳｈａｐｅｍｅｍｏｒｙａｌｌｏｙｓ（ＳＭＡｓ）ａｒｅｅｘｃｅｌｌｅｎｔｃａｎｄｉｄａｔｅｓｆｏｒｃｏｎｔｒｏｌｓｙｓｔｅｍｓａｎｄａｒｅｃｏｍｍｏｎｌｙｒｅｆｅｒｒｅｄｔｏａｓ“ｓｍａｒｔ”ｍａｔｅｒｉａｌｓｄｕｅｔｏｔｈｅｉｒａｂｉｌｉｔｙｔｏｃｈａｎｇｅｓｈａｐｅｗｉｔｈｔｅｍｐｅｒａｔｕｒｅ．Ｔｈｅｓｅａｌｌｏｙｓｃａｎａｌｓｏｇｅｎｅｒａｔｅｓｉｇｎｉｆｉｃａｎｔａｍｏｕｎｔｓｏｆｓｔｒａｉｎ（ａｎｄｓｔｒｅｓｓ）ａｎｄａｒｅｉｄｅａｌｆｏｒｕｓｅｉｎａｃｔ…     

DEFORMATION OF HfVNb LAVES PHASE ALLOYS

１　ＩＮＴＲＯＤＵＣＴＩＯＮＯｎｅｗａｙｔｏｓｅｌｅｃｔｃａｎｄｉｄａｔｅａｌｌｏｙｓｏｆｐｏｓｓｉｂｌｅｉｎｔｅｒｅｓｔｆｏｒｈｉｇｈｔｅｍｐｅｒａｔｕｒｅａｐｐｌｉｃａｔｉｏｎｓｉｓｔｏｒｅｑｕｉｒｅａｃｏｍｂｉｎａｔｉｏｎｏｆｈｉｇｈｍｅｌｔｉｎｇｔｅｍｐｅｒａｔｕｒｅａｎｄｌｏｗｄｅｎｓｉｔｙ，ａｓｒｅｐｏｒｔｅｄｂｙＦｌｅｉｓｃｈｅｒ［１］．Ｈｅｓｈｏｗｅｄｔｈａｔ，ｉｎｇｅｎｅｒａｌ，Ｌ１２ａｌｌｏｙｓａｒｅｐｒｏｂａｂｌｙｎｏｔｖｅｒｙｇｏｏｄｃａｎｄｉｄａｔｅｓ，ｓｉｎｃｅ…     

THERMAL ACTIVATION ANALYSIS ON TENSILE DEFORMATION IN Ti47Al2Mn2Nb ALLOY

１　ＩＮＴＲＯＤＵＣＴＩＯＮγＴｉＡｌ／α２Ｔｉ３ＡｌｔｗｏｐｈａｓｅｉｎｔｅｒｍｅｔａｌｌｉｃｓｏｒＴｉＡｌａｌｌｏｙｈａｓｒｅｃｅｎｔｌｙｒｅｃｅｉｖｅｄｉｎｃｒｅａｓｉｎｇａｔｔｅｎｔｉｏｎｂｅｃａｕｓｅｏｆｉｔｓｐｏｔｅｎｔｉａｌａｓａｓｔｒｕｃｔｕｒａｌｍａｔｅｒｉａｌｆｏｒｈｉｇｈｔｅｍｐｅｒａｔｕｒｅａｐｐｌｉｃａｔｉｏｎｓ,ｗｈｉｃｈａｒｉｓｅｓｆｒｏｍｉｔｓｅｌｅｖａｔｅｄｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｓｔｒｅｎｇｔｈ,ｌｏｗｄｅｎｓｉｔｙａｎｄｇｏｏｄｏｘｉｄａｔｉｏ…     

中厚板控冷过程热应力组织耦合模拟分析

利用有限元模拟技术,建立了钢板冷却过程的热、力和组织耦合的有限元模型,计算了在控冷输出辊道上3种不同冷却模式下的温度场、应力场和组织场。分析表明,采用稀疏冷却方式能提高厚度方向上的冷却均匀性;上下表面冷却均匀有利于减小钢板的翘曲;采用不同冷却路径可获得不同的组织和性能。其分析可为中厚钢板控冷获得理想的板形、组织和性能提供理论依据。     

100 t EAFLFCCM流程生产SWRH82B的工艺实践

安钢第一炼轧厂采用100 t FSFLF6机6流工艺路线生产冶炼了预应力钢绞线SWRH82B。其关键工艺参数控制：电炉终点w(C)＝050％～070％，精炼炉控制精炼时间大于40 min，保证上钢前弱吹氩，控制钢水中夹杂物，连铸中中间包温度控制在 1482～1497 ℃，拉速22～24 m/min，采用结晶器电磁搅拌和末端电磁搅拌，全程保护浇注。结果表明，实物的质量和力学性能均完全达到了使用要求。     

SYNTHESIS AND MECHANICAL PROPERTIES OF NiAlBASED COMPOSITES

１　ＩＮＴＲＯＤＵＣＴＩＯＮＮｉＡｌｈａｓｒｅｃｅｉｖｅｄｍｕｃｈａｔｔｅｎｔｉｏｎａｓｐｏｔｅｎｔｉａｌｓｔｒｕｃｔｕｒａｌｍａｔｅｒｉａｌｓｆｏｒｈｉｇｈｔｅｍｐｅｒａｔｕｒｅａｐｐｌｉｃａｔｉｏｎｓ．Ｈｏｗｅｖｅｒ,ｐｏｏｒｄｕｃｔｉｌｉｔｙａｔｒｏｏｍｔｅｍｐｅｒａｔｕｒｅａｎｄｌｏｗｓｔｒｅｎｇｔｈａｔｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｈｉｎｄｅｒｉｔｓａｐｐｌｉｃａｔｉｏｎ［１－６］．Ｍａｎｙｍｅｔｈｏｄｓｈａｖｅｂｅｅｎａｐｐｌｉｅｄｔｏｉｍｐｒｏｖｅｉｔｓｄｕｃｔｉｌｉｔｙ,ｓ…     

Co-15wt%Y合金的高温硫化氧化腐蚀

为检验添加钇对纯钴耐高硫低氧混合气腐蚀的影响,研究了Ｃｏ１５ｗｔ％ Ｙ 合金在６００ ～７００ ℃Ｈ２Ｈ２ＳＣＯ２ 混合气中的腐蚀。合金腐蚀后形成多层结构的腐蚀产物膜,最外层是单一的硫化钴,中间层为由两金属化合物组成的混合物层。最内层是由氧和硫引起的钇的内腐蚀区。在钇含量达到１５ｗｔ％ 的条件下未发生钇的选择性外硫化／ 氧化,这与钇在基体金属中有限的固溶度和合金中出现富钇金属间化合物有关。     

RHTB浸渍管长寿技术研究与应用

结合鞍钢1700ASP中薄板坯连铸生产硅钢的实践,系统分析了RHTB浸渍管的损毁机理,并据此采取了相应的改进措施。通过优化烘烤制度、维护方式、生产组织模式和生产工艺,有效地提高了鞍钢1700ASP线RHTB浸渍管的使用寿命,为鞍钢1700ASP线硅钢的稳定生产提供了保证。     

双波长叠加分光光度法测定微量钯

研究了2-(3,5-二氯-2-吡啶偶氮)-5-二甲氨基苯胺(简称为3,5-diCl-PADMA)与钯的显色反应,在0.02～1.6mol/L的H2SO4介质中,钯与试剂形成稳定的1:1绿蓝色配合物,其在621nm和574nm有2个强弱不等吸收峰.2个峰的吸光度之和与钯浓度线性相关,据此建立了应用双波长叠加分光光度法测定微量钯的新方法.钯浓度在0～12μg/10mL范围内符合比尔定律,表观摩尔吸光系数高达1.61×105L·mol-1·cm-1,比单波长法提高52%.大量的有色金属及其它贵金属离子不干扰测定.所研究的方法操作简便,灵敏度高,选择性好,用于合金及含钯分子筛中微量钯的直接测定结果满意.     

铑钨杂多酸-甲苯胺蓝缔合体系测定痕量铑

研究了在6.0mol/L H2SO4及聚乙烯醇(PVA )存在下, Rh(Ⅲ)与钨酸盐及甲苯胺蓝(TB)形成缔合物的最佳反应条件, 建立了测定Rh (Ⅲ)的高灵敏光度分析新方法.缔合物体系在570 nm处的吸光度与Rh (Ⅲ)的在0.01～0.125(g/25 mL质量浓度的吸光度服从比耳定律, 其摩尔吸光系ε=5.68×107L·mo l-1·cm-1.大量常见离子对Rh (Ⅲ)的测定不干扰.建立的方法用于测定催化剂及工业产品中铑的含量, 结果与标准方法(SnCl2方法) 测得值一致.     

DBC-偶氮氯膦固相光度法测定痕量镧

在0.5 mo1·L-1盐酸介质中,La(Ⅲ)-(DBC-偶氮氯膦)所形成的络合物可吸附到201×7型苯乙烯阴离子树脂上.该固相显色体系最大吸收波长位于650 nm,镧的表观摩尔吸光系数为ε650nm=2.08×l05L·mol-1·cm-1.该固相分光光度法测定镧灵敏度为La(Ⅲ)-(DBC-偶氮氯膦)液相分光光度法灵敏度的2.31倍.镧在0～0.44 μg.ml-1范围内遵守比尔定律.考察了26种共存离子对测定镧的影响.本研究所建立的方法已成功地用于分子筛中镧的测定,结果满意.     

铀试剂光度法测定钛铝合金中微量锑

研究了分光光度法在测定钛铝合金中微量锑的应用。试样以硫酸溶解，在０５ｍｏｌ／Ｌ～０９ｍｏｌ／Ｌ硫酸介质中，五价锑被抗坏血酸、硫脲联合还原为三价锑，三价锑与碘化钾、铀试剂（５－Ｂｒ－ＰＡＤＡＰ）形成三元离子配合物，该配合物可被苯萃取后于分光光度计６２０ｎｍ处测量吸光度，借以确定钛铝合金中０２０％以下含量的锑。在确定的条件下钛铝合金元素、常见杂质元素及磷、碲等均不干扰锑的测定。通过对合成样品的分析表明，该方法简便，结果准确可靠，相对标准偏差为１％～２％。     

Determination of Trace Amount of Yttrium with Bromopyrogallol Red by solid-phase Spectrophotometry

SolidPhase sPectroPhOtometry (SPS) was in-troduced in 1976 [l1. lt had mny theortant advatages, such as higher sensitlyity bcher selec-tivity and raPid determination procedur. Niob-iam l2], Minum and berylldri [3] had beensuccessfully determined recentiy by this meth-od. Wth BPR the molybdenum [4] and bismuth[5] were also determined by SPS. In thes paPerBPR was used as the chromogenic reapeni toforIn a 1. 1 blue cOmPlex with yttrinIn (III)Which was easily and strongly sorbed and con…     

Effects of Nitridation Temperature on Characteristics of Gallium Nitride Thin Films Prepared Via Two-Step Method

In this research,the growth of GaN thin films on c-plane sapphire(0001) substrates via two-step method without the assist of buffer layer and catalysts was demonstrated.First,gallium oxide(Ga_2O_3) thin films were deposited on sapphire substrates by radio frequency magnetron sputtering method.The deposited Ga_2O_3 thin films were then nitridated at various temperatures.In this research,attention is focused on the influence of nitridation temperatures on the structural and optical properties of the synthesized GaN thin films.It is revealed that 950 ℃ is the optimal nitridation temperature for synthesizing hexagonal wurtzite GaN thin film with preferential(0002) growth direction.     

配体交换动力学法测定痕量银的研究

在酸性条件下痕量Ａｇ（Ｉ）对Ｋ４［Ｆｅ（ＣＮ）６０３６１－尿素间的配体交换反应具有显著的催化效应,催化反应的表观活化能为１８．１２ｋＪ·ｍｏｌ＾－１。本文据此建立了测定痕量银的配体交换动力学分析法,测定条件为Ｋ４［Ｆｅ（ＣＮ）６］：８．０×１０＾－４ｍｏｌ·Ｌ＾－１,［ＣＨ３ＣＯＯＨ］：０．１２ｍｏｌ·Ｌ＾－１,［ＣＯ（ＮＨ２）２］：６．０×１０＾－４ｍｏｌ·ｍｌ＾－１,８０℃。线性测定范围为１０     

Behavior of 2-ethylhexanoic Acid in Organic Phase of Gallium Extraction

The rate of batch extraction of gallium from alkaline aqueous solution was studied by adding2-ethylhexanoic acid in organic phase containing 7-substituted-8-hydroxyquinoline(extractant N601),n-decanol and kerosene.The extraction of Ga can be considered as a pseudo-homogeneous first-order reac-tion.The neutralization and distribution of organic acid between phases during the extraction were studied.The effect of 2-ethylhexanoic acid on the protonation of N601 is insignificant.The extraction of HCl duringthe stripping of gallium is mainly dependent on the concentration of aqueous hydrochloric acid and the con-tent of N601.Under the given conditions of temperature and N601 content,the acidity of organic phase isa linear function of the concentration of carboxylic acid in organic phase and the concentration ofhydrochloric acid in equilibrium aqueous phase,if the latter is 1.9～5.6 mol/L.     

高纯钨中杂质元素的化学光谱法测定

采用以一定比例的ＨＮＯ３和ＨＣｌ为介质，使钨沉淀成钨酸与杂质分离，然后用碳粉吸附杂质再进行光谱测定的方法，对高纯钨（包括金属钨、三氧化钨、钨酸、钨酸铵）中１５个杂质元素Ｆｅ、Ｎｉ、Ｃｕ、Ｍｎ、Ａｌ、Ｖ、Ｃｒ、Ｃｏ、Ｃａ、Ｍｓ、Ｐｂ、Ｓｎ、Ｂｉ、Ｃｄ、Ｂｅ进行了测定，取得了理想的结果，测定下限可达（０．１～０．５）×１０（－６）。     

液膜法分离富集,测定水中微量锶

用乳状液膜体系对锶进行分离富集，该体系包括协同流动载体（ＰＭＢＰ，ＴＢＰ），表面活性剂（ＳＰＡＮ８０）增强剂（丙三醇）溶剂（正己烷）和内相（１．２ｍｏｌ／Ｌ的盐酸溶液），实验表明，在适宜的条件下，锶的富集效率可达９９．５％以上，而在此条件下许多共存离子，如Ｆｅ＾３＋，Ａｌ＾３＋，Ｃａ＾２＋，Ｍｇ＾２＋，Ｂａ＾２＋，Ｃｒ＾３＋，ＣＯ＾２＋，Ｎｉ＾２＋，Ｚｒ＾４＋，Ｃｕ＾２＋，Ｚｎ＾２＋，Ｐｂ＾２＋和