材料期刊网

Shape-Memory Intermetallics Development in Taiwan

S.K.Wu(Institute of Materials Science and Engineering , National Taiwan University Taipei , Taiwan 106 , China) H.C. Lin(Department of Materials Science , Feng-Chia University. Taichung. Taiwan 407. China)

金属学报(英文版)

In Taiwan, many groups engage in the development of TiNi SMAs. The two-stage martensitic transformations of and have been clarified for both TiNi binary and ternary alloys. The deformation behaviors have been investigated by cold-rolling, hot-rolling and wire drawing. Both shape memory effect and pseudoelasticity can be improved by some thermal-mechanical treatments. The damping characteristics of TiNi and TiNiX SMAs have also been systematically studied. Both B19'/B19 martensite (M)and R-phase(R) have high daming capacities due to the stress-induced movement of twin boundaries. Meanwhile, the addition of third elements-Fe and Cu-can largely increase the damping capacity.Recently, some high temperature shape memory alloys-TiHiPd and TiNi-.Au alloys-have also been intensively studied in Taiwan. All these potential investigations on the TiNi SMAs in Taiwan have attracted much attention and their important characteristics will be applied widely in the near future.

关键词: : TiNi shape memory alloys. research and development in Taiwan

R407C地源热泵系统实验研究

李兴 , 俞坚

工程热物理学报

本文以三元非共沸混合工质R407C对传统工质HCFC22进行了替代,搭建了地源热泵系统实验台.考虑到在地源热泵运行时,地下土壤温度会因运行时间和冬夏季节的不同而发生变化,造成热泵的各种不同运行工况.为全面反映热泵的运行状态制订了测试方案,并对测试数据进行了整理和分析.该热泵系统在加热与制冷运行模式下COP均可达到3.6以上.

关键词: 地源热泵 , 混合工质R407C , 运行工况 , 性能测试

STATISTICAL EVALUATION OF CRITICAL INCLUSION FACTOR FOR SECONDARY RECRYSTALLIZATON IN 3%Si STEEL Lecturer,Department of Materials Engineering,Southwestern Jiaotong University,Chengdu 610031,China

LI Shuchen Southwestern Jiaotong University , Chengdu , ChinaCHEN Mengzhe KE Jun University of Science and Technology Beijing , Beijing , China

金属学报(英文版)

On the basis of statistical data of MnS in the conventional 3% Si steel sheeets after various annealing processes,the critical inclusion factor has been evaluated to be 20 mm~(-1).The inhi- bition of MnS to grain growth has been exactly described.

关键词: 3%Si steel , null , null

CORRELATION BETWEEN STRESS COMPONENTS AND STRESS CORROSION CRACKS IN BRASS Lecturer,Department of Materials Physics,University of Science and Technology Beijing,Beijing 100083,China

QIAO Lijie LIU Rui XIAO Jimei University of Science and Technology Beijing , Beijing , China

金属学报(英文版)

The effects of stress components on nucleation sites and propagation directions of stress cor- rosion cracks in brass were investigated with specimens under mode Ⅱ and mode Ⅲ loadings. The results indicated that under mode Ⅱ loading,stress corrosion cracks nucleated on the site with maximum normal stress component and propagated along the plane perpendieular to the maximum normal stress,under mode Ⅲ loading,the stress corrosion crack was not evident on the 45°plane due to the general corrosion in aqueous solution with high NH_4OH concentra- tion,while stress corroded in aqueous solution with low NH_4OH concentration, numerous cracks with spacings of 10—150μm were found on the 45°plane with maximum normal stress and no stress corrosion cracks was observed on the plane with maximum shear stress.

关键词: stress corrosion cracking , null , null , null

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

R407C水冷冷凝器传热强化的实验研究

张正国 , 文磊 , 高学农 , 丁静 , 吕树申 , 林培森

工程热物理学报

本文通过实验,研究了替代制冷工质R407C在螺旋隔板花瓣管冷凝器中的传热性能,实验结果表明,随着热流密度的增加,冷凝器的总传热系数也不断增大.在相同热流密度下,其总传热系数比板式冷凝器提高40%以上.

关键词: R407C , 冷凝器 , 强化传热

长期时效对DD407单晶高温合金组织和中温性能的影响

韩凤奎，燕平，赵京晨，张龙飞，曾强

钢铁研究学报

研究了DD407单晶高温合金在900℃长期无应力时效过程中，组织的演变规律及其对中温性能的影响。研究结果表明：经长达3000h的时效后，合金的组织稳定，无有害相析出，760℃中温强度稳定，但伸长率显著提高。

关键词: 单晶高温合金 , long-term ageing , DD407 , microstructure , ductility

长期时效对DD407单晶高温合金组织和中温性能的影响

韩凤奎 , 燕平 , 赵京晨 , 张龙飞 , 曾强

钢铁研究学报

研究了DD407单晶高温合金在900℃长期无应力时效过程中,组织的演变规律及其对中温性能的影响。研究结果表明：经长达3 000 h的时效后,合金的组织稳定,无有害相析出,7 6 0℃中温强度稳定,但伸长率显著提高。

关键词: 单晶高温合金 , 长期时效 , DD407 , 组织 , 塑性

R410A和R407C饱和液相运动黏度测量

张颖 , 何茂刚 , 刘洋

工程热物理学报

改进了倾斜管式黏度测量实验系统,使其能够适用于非共沸物质饱和液相黏度的测量.对制冷剂 R22的替代物质一近共沸二元混合制冷剂R410A和非共沸三元混合制冷剂R407C的饱和液相运动黏度进行了测量,实验温度范围为256.15～336.15 K.同时,依据实验数据建立了制冷剂R410A和R407C饱和液相运动黏度与温度的关联式.

关键词: 运动黏度 , R410A , R407C , 实验测量