材料期刊网

EFFECT OF SUBSTRUCTURE AND RESIDUAL STRESS IN STRENGTHENED LAYER ON FATIGUE STRENGTH OF STAINLESS OR LOW CARBON STEEL

TAN Yuxu REN Liping LI Gang Xi'an Jiaotong University , Xi'an , China TAN Yuxu Associate Professor , Institute of Metallic Materials and Strength , Xi'an Jiaotong University , Xi'an 710048 , China

金属学报(英文版)

In the strengthened layer of stainless steel after shot peening,there are a great amount of deformation microtwins which may act as structural strengthening factor and prevent the gradual relaxation of surface residual stress during fatigue,so as to keep its rather high level of bending fatigue strength.However,in the strengthened surface layer of low carbon steel, dislocation cell structure is so unstalbe during fatigue that its surface residual stress relaxation cannot be retarded.Therefore,the bending fatigue strength of the low carbon steel can not be improred by shot peening.

关键词: substructure , null , null

立方 TaN纳米粉的制备

类伟巍 , 沈龙海 , 刘丹 , 李雪飞 , 彭刚 , 崔启良 , 邹广田

无机材料学报 doi:10.3724/SP.J.1077.2007.00400

采用直流电弧法使金属钽和氮气直接反应制备出了TaN纳米粉．利用XRD、XPS、TEM等测试方法对所制备的TaN纳米粉进行了表征．结果表明: 所制备的纳米粉为单一的立方相TaN, 纳米颗粒的平均粒度为5~10nm．实验中还发现氮气的气压对制备纯立方相TaN具有关键性作用, 并讨论了立方相TaN的形成机理．

关键词: 立方相TaN , nanocrystallites , dc arc discharge method

立方TaN纳米粉的制备

类伟巍 , 沈龙海 , 刘丹 , 李雪飞 , 彭刚 , 崔启良 , 邹广田

无机材料学报 doi:10.3321/j.issn:1000-324X.2007.03.004

采用直流电弧法使金属钽和氮气直接反应制备出了TaN纳米粉.利用XRD、XPS、TEM等测试方法对所制备的TaN纳米粉进行了表征.结果表明:所制备的纳米粉为单一的立方相TaN,纳米颗粒的平均粒度为5～10nm.实验中还发现氮气的气压对制备纯立方相TaN具有关键性作用,并讨论了立方相TaN的形成机理.

关键词: 立方相TaN , 纳米粉 , 直流电弧法

Microstructural study on multilayer FeTaN/TaN (5) films

Materials Letters

The microstructure of [FeTaN/TaN](5) multilayer films has been investigated by transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM) in cross section and plan view. Each layer shows a small surface roughening less than 1 nm. The FeTaN layers are composed of b.c.c. Fe with Ta incorporated substitutionally and N interstitially, denoted as Fe(Ta,N); while the TaN layers mainly consist of f.c.c. TaN phase. A [110] texture of Fe(Ta,N) has been formed in the FeTaN layers. The columnar grain structure is a typical feature in FeTaN layers. (C) 2003 Elsevier Science B.V. All rights reserved.

关键词: microstructure;thin films;magnetic materials;transmission electron;microscopy (TEM);sputtering;fetan thin-films;magnetic-properties;recording-heads;tantalum;nitride;temperature

High temperature naphthenic acid corrosion of steel in high TAN refining media

Anti-Corrosion Methods and Materials

Purpose - This paper aims to study the corrosion behavior of carbon steel and stainless steel in white oil with naphthenic acid under high temperature. Design/methodology/approach - The weight-loss method and surface analysis were used to study the corrosion behavior of steel in white oil with naphthenic acid. Findings - Naphthenic acids corrosion rates were directly related to experimental temperature, immersion time and total acid number (TAN). The activation energy was calculated and the process kinetics could be represented by Arrhenius-type equation. The relationship between the isothermal line in liquid phase and that in vapor phase at different TAN values had a significant distinction with the change of temperature. Originality/value - The findings have important implications for assessing the corrosivity of crude oils with high TAN value from various resources.

关键词: Corrosion;Stainless steel;Oils;Acids;refineries

Introduction to atmospheric corrosion research in China

Science and Technology of Advanced Materials

In this paper, we introduce the research on atmospheric corrosion in China. We describe the climate characteristics and the classification of atmospheric corrosivity across the whole country. We also describe the rusting evolution under simulated wet/dry cyclic conditions. (C) 2007 NIMS and Elsevier Ltd. All rights reserved.

关键词: atmospheric corrosion;corrosivity;rusting evolution;weathering steels;rust;mechanism;so2;o-3;no2

Recent Advances of Laser Coating Technology in China

LIANG Yong LI Ruiguo Institute of Metal Research , Academia Sinica , Shenyang 110015 , ChinaInstitute of Corrosion and Protection of Metals , Aademia Sinica , Shenyang , 110015 , China

材料科学技术（英文）

Recent advances in laser coating technology including laser cladding,laser surface alloying and laser vapour deposition in China are reviewed in this paper.

关键词: laser , null , null , null , null

TaN薄膜局部腐蚀早期过程的ECAFM原位研究

俞春福 , 徐久军 , 黑祖昆

腐蚀与防护 doi:10.3969/j.issn.1005-748X.2004.03.005

电化学原子力显微镜(ECAFM)可以在液体环境下工作,能原位观察电极反应过程中的腐蚀界面形貌.文章介绍利用ECAFM从纳米空间分辨度上原位研究离子束增强沉积TaN膜在0.4mol/L HCl溶液中的局部腐蚀早期过程,结果发现,表面形貌为颗粒状结构的TaN膜在0.4mol/L HCl中进行阳极极化时,颗粒结构的微观顶峰优先溶解,导致颗粒高度降低,边界扩大蔓延,使膜层表面趋于平整化.

关键词: 电化学原子力显微镜 , TaN , 原位 , 腐蚀

Development of Cast Superalloys for Gas Turbines in China

CHEN Rongzhang CHEN Wanhua Institute of Aeronautic Materials , Beijing 100095 , China.

材料科学技术（英文）

As in other countries,significant achievements in the research of cast superalloys for many years have also been obtained in China.These results are important contribu- tion to the development of aero and land-based gas tur- bine engines.

关键词: cast superalloy , null

不同调制周期Cu/TaN多层膜的微结构与表面形貌

赵海阔 , 雒向东

量子电子学报 doi:10.3969/j.issn.1007-5461.2009.01.018

采用磁控溅射方法在Si(111)基底上沉积不同调制周期的Cu/TaN多层膜,用X射线衍射仪(XRD)与原子力显微镜(AFM)表征薄膜微结构与表面形貌,研究了不同调制周期L薄膜的微结构与表面形貌.结果表明:不同L的TaN调制层均为非晶结构,多晶Cu调制层的晶粒取向组成随着L改变而变化; Cu调制层的表面粗糙度Rrms.大于TaN调制层的Rrms;与Cu单层膜相比,最外层为Cu调制层的Cu/TaN多层膜的Rrms较小;与TaN单层膜相比,最外层为TaN调制层的Cu/TaN多层膜的/Rrms较大;随着L增加,多层膜与对应的单层膜之间的兄Rrms差值逐渐减小.

关键词: 光电子学 , Cu/TaN , 多层膜 , 调制周期 , 表面形貌