材料期刊网

INFLUENCE OF TOP TEMPERATURE OF THERMAL CYCLE ON THERMAL STRESS/STRAIN AND THERMAL FATIGUE BEHAVIOR OF PURE IRON

J.H.Liu 1) and S.H.Jiang 1) and M.Yao 2) 1) Department of mechanical Engineering , Engineering college , Yangzhou University , Yangzhou 225009 , China 2) Department of Material Science , Yanshan University , Qinhuangdao 066000 , China

金属学报(英文版)

By using a self-made thermal fatigue test machine of outer-constraint mode, the influence of top-temperature of thermal cycle T t on thermal stress-strain and thermal fatigue behavior of an industrial pure iron was investigated. The T t was varied from stress/strain 773K to 1073K. The results show that, increasing of T t , the thermal stress-strain cycles can be classified into four types, they are: compressive stress cycle; compressive strain-tensile stress cycle; compressive strain-tensile stress cycle than changing to compressive tensile plastic strain cycle; and finally, compressive tensile plastic strain cycle. It is also revealed that certain relationship does exist between thermal fatigue life and characteristics of thermal stress/strain cycle. When compressive tensile plastic strain cycle were appear by increasing of T t , thermal fatigue life decreasing rapidly. The concept of thermal fatigue transition temperature, and determining method were put up in this thesis.

关键词: thermal fatigue , null

Interaction of Mechanical and Electrochemical Factors during Corrosion Fatigue of Fe-26Cr-1Mo Stainless Steel in 1M H_2SO_4 Solution

Jianqiu WANG , Jin LI , Ziyong ZHU and Wei KE (Corrosion Science Laboratory , Institute of Corrosion and Protection of Metals Chinese Academy of Sciences , Shenyang , 110015 , China)Qishan ZANG and Zhongguang WANG (State Key Laboratory for Fatigue and Fracture

材料科学技术（英文）

The cyclic plastic straining electrode technique has been used to investigate the transient electrochemical behaviour of Fe-26Cr1Mo stainless steel in 1M H2SO4 solution at a passive potential.The influence of plastic strain amplitude and plastic strain rate on the dissolution current response was analysed. The experimental results showed that the transient current was dependent on the competitive process of the surface film rupture and repassivation of the new surface. The high plastic strain amplitude and the high plastic strain rate caused a change of electrochemical activity of specimen surface. In the condition of low strain amplitude and strain rate, the characteristics of current response was mainly relative tp the process of new surface repassivation.The competition kinetics has been analysed through the comparison of plastic strain rate and repassivating rate

关键词:

INTERACTION OF MECHANICAL AND ELECTROCHEMICAL FACTORS DURING CORROSION-FATIGUE OF FE-26CR-1MO STAINLESS-STEEL IN 1M H2SO4 SOLUTION

材料科学技术（英文）

The cyclic plastic straining electrode technique has been used to investigate the transient electrochemical behaviour of Fe-26Cr-1Mo stainless steel in 1M H2SO4 solution at a passive potential. The influence of plastic strain amplitude and plastic strain rate on the dissolution current response was analysed. The experimental results showed that the transient current was dependent on the competitive process of the surface film rupture and repassivation of the new surface. The high plastic strain amplitude and the high plastic strain rate caused a change of electrochemical activity of specimen surface. In the condition of low strain amplitude and strain rate:, the characteristics of current response was mainly relative to the process of new surface repassivation. The competition kinetics has been analysed through the comparison of plastic strain rate and repassivating rate.

关键词:

H_2气氛保护热处理1J50组织结构与性能的研究

孙建春 , 盛光敏 , 陈登明 , 周安若 , 朱光俊

功能材料

1J50软磁合金的性能主要是通过H_2热处理获得的,在1130℃和H2气氛保护下对冷轧态1J50软磁合金进行了热处理.运用MATS-2010SA软磁测试仪对处理前后1J50软磁合金的磁性能进行了检测,运用金相显微镜、XRD等手段对处理前后1J50软磁合金的组织结构进行了分析.结果表明,通过H_2热处理,1J50软磁合金的矫顽力显著降低,起始磁导率和最大磁导率提高;组织结构发生明显变化,冷轧态1J50软磁合金组织为孪晶奥氏体,平均晶粒尺寸为200μm,处理过后,晶粒显著长大,平均晶粒尺寸为100μm;由于在600℃时采取了快冷,处理后1J50软磁合金中未出现大量FeNi相和FeNi_3相.

关键词: H2热处理 , 1J50 , 组织结构 , 性能

1Cr18Ni9Ti在S—Cl—H_2O环境中的腐蚀行为分析

张建苏 , 袁昌言

腐蚀学报（英文）

1Cr18Ni9Ti在S—Cl—H_2O环境中的腐蚀行为分析张建苏,袁昌言(北京航空材料研究所第五研究室,北京100085)本文以某厂汽提塔再沸器(以下简称E1105)1Cr18Ni9Ti换热管腐蚀故障为例,对其腐蚀现象进行分析.1.E1105换热管腐蚀概况及分析结果换热管内通水蒸汽,管外通石脑油,材料为1Cr18Ni9Ti,其工艺参数为:蒸汽温度246℃,蒸汽压力3.8MPa,气相石脑油温度151℃,气相石脑油压力0.64MPa.人口的石脑油含S量为1.58ppm,含Cl量为3.95ppm,含H。O..

关键词:

1m3/h RO-EDI高纯水设备的研制

刘红斌 , 龚承元 , 苏建勇 , 朱孟府 , 马军 , 张西正

膜科学与技术 doi:10.3969/j.issn.1007-8924.2002.03.014

介绍了工业规模的EDI膜堆和1 m3/h RO-EDI高纯水设备的研制情况,进行了设备的稳定性试验和EDI产水的水质分析,并与离子交换树脂进行了技术经济性能比较.

关键词: 电去离子 , 反渗透 , 制药用水 , 高纯水

稀土区奇奇核πh11/2(×)νi13/2带B(M1)/B(E2)比值增强特性

陆景彬 , 刘运祚 , 孙亮 , 杨东 , 梁国栋 , 王守宇 , 马英君 , 赵广义 , 李险峰 , 崔兴柱 , 李明非 , 霍俊德 , 曾国模 , 竺礼华 , 吴晓光

原子核物理评论 doi:10.3969/j.issn.1007-4627.2005.02.003

在稀土区奇奇核πh11/2(×)νi13/2转动带中, 系统地观测到随转动频率或角动量增加, B(M1)/B(E2)曲线表现出所谓parabola-like形状, 即在增加到某一转动频率或自旋后, B(M1)/B(E2)比值快速增强. 基于推转模型和粒子转子模型关于奇奇核二准粒子转动带磁偶极约化跃迁几率的描述, 对稀土区双奇核的这一行为进行了讨论. 指出该现象的发生与νi13/2准中子转动顺排特性密切相关. B(M1)/B(E2)比值在接近第二带交叉(即BC准中子对顺排)的较高频率处的增强效果, 可以理解为主要来源于带交叉引起的波函数中混合四准粒子成分的结果. 通过对B(M1)/B(E2)比值的增强效果发生在较低频率处的分析, 对稀土区奇奇核πh11/2(×)νi13/2带角动量耦合图像有了进一步认识.

关键词: 高自旋态 , 奇奇核 , 电磁跃迁特性 , 顺排

茂金属催化剂Cpt2MCl2(Cpt=tBuC5H4，M=Ti、zr、Hf)聚合丁烯-1的研究

周光远 , 程延祥 , 金国新

应用化学 doi:10.3969/j.issn.1000-0518.2001.05.025

探讨了茂金属催化剂Cpt2MCl2(CPt=tBuC5H4，M=Ti，zr，Hf)的合成以及用于聚合丁烯-1的研究，研究了几种不同的茂金属催化剂和不同聚合条件下的催化行为，并通过IR、1H NMR、EI-MS、DSC、粘度法测分子量和正庚烷抽提等测试手段对催化剂和聚合物进行了表征．结果表明，叔丁基取代的茂金属催化剂催化丁烯-1聚合具有较高的催化活性，叔丁基的引入提高了聚合物的等规度和分子量．

关键词: 茂金属催化剂 , 丁烯-1 , 聚合

H2S水溶液中的腐蚀与缓蚀作用机理的研究1.酸性H2S溶液中碳钢的腐蚀行为及硫化物膜的生长

杨怀玉 , 陈家坚 , 曹楚南

中国腐蚀与防护学报

利用交流阻抗（EIS）和极化曲线，结合扫描电镜（SEM）和能谱分析， 对常温下低碳钢在含H2S的模拟炼厂常减压塔顶冷凝水中的腐蚀电化学行为和不同浸泡时间下硫化物膜的生长过程进行了研究。结果表明，H2S对腐蚀反应的阴极过程有很大的促进作用，搅拌条件下尤甚；随介质pH值升高，其腐蚀性减弱。腐蚀浸泡初期（小于8h），电极表面硫化物膜的生长遵循抛物线机制，随浸泡时间的延长，硫化物膜变得疏松、易于破裂和脱落，并出现二次生长、修复过程，最终达到膜生长和溶解的平衡。实验条件下电极表面所生成的硫化物膜，不足以对碳钢起到保护作用。

关键词: 交流阻抗 , potentiodynamic polarization , H2S corrosion , sulfide film

层状H1-xNb1-xW1+xO6固体酸的制备与表征

谢慕华 , 丁志福 , 李瑞

材料导报

采用高温固相法合成Li1-xNb1-xW1+xO6 (x=0.1,0,-0.1),通过H+交换制备出相应的固体酸H1-x-Nb1-xW1+xO6.采用XRD和FT-IR技术表征固体酸的物相和层板骨架结构,NH3-TPD方法表征其酸性特征.结果表明,3种酸样品的物相相同,但它们的主晶面(002)面间距略有变化.与HNbWO6中的NbO6和WO6八面体结构单元相比,H0.9Nb0.9 W1.1O6和H1.1 Nb1.1 W0.9 O6中的NbO6和WO6八面体发生变形.3种酸样品均有两种不同强度的酸位,它们的弱酸位强度基本相等,强酸位强度大小顺序为HL1 Nb1.1W0.9O6 ＞H0.9 Nb0.9 W1.1 O6＞ HNbWO6,两种酸位的酸量大小顺序均为H1.1 Nb1.1 W0.9 O6＞ HNbWO6＞ H0.9Nb0.9W1.1O6.

关键词: 层状化合物 , 铌钨酸 , 结构 , 酸性