材料期刊网，材料期刊，材料类期刊，材料期刊投稿

304 stainless steel coating was deposited on the IF steel substrate by cold gas dynamic spraying (CGDS), and the elastic modulus of the 304 stainless steel coating was studied. The elastic modulus of cold sprayed 304 stainless steel coating was measured using the three-point bend testing and the compound beam theory, and the other mechanic parameters (such as the equivalent flexural rigidity and the moment of inertia of area) of the coatings were also calculated using this compound beam theory. It is found that the calculated results using the above methods are accurate and reliable. The elastic modulus value of the cold sprayed 304 stainless steel coating is 1179×105 MPa, and it is slightly lower than the 304 stainless steel plate (about 2×105 MPa). It indicates that the elastic modulus of the cold sprayed coatings was quite different from the comparable bulk materials. The main reason is that the pores and other defects are existed in the coatings, and the elastic modulus of the coatings also depends on varies parameters such as the feed stock particle size, porosity, and processing parameters.

关键词: cold gas dynamic spraying , 304 stainless steel coating , three-point bend testing , compound beam theory , elastic modulus

Effect of Cooling Rate on Microstructure and Mechanical Properties of K465 Superalloy

PEI Zhong-ye , HAN Wei , ZHAO Gang , CHEN Xing-fu , LI Jun-tao , TIAN Yan-wen

钢铁研究学报(英文版)

K465 superalloy, as a material for production of turbine nozzle, shows high mechanical properties as well as microstructure stability in critical and severe service conditions. The alloy gains its appropriate microstructure and strength through solid solution strengthening mechanism. Heat treatment parameters such as: time and temperature of homogenization, partial solution and aging temperatures, and cooling rate from solid solution affect the microstructure of the alloy. Among these parameters cooling rate from solid solution is the most effective. Therefore, in this study the effect of cooling rate on microstructure and mechanical properties (tensile and stress properties) were investigated. For this purpose, three different cooling rates were applied on the cast K465 specimens after solution treatment at 1210℃ for 4 h. Microstructures of the specimens then were studied using optical and electron microscopy. Also, tensile tests were performed at room temperature and stress rupture tests were performed under the condition of 975℃ and 230 MPa. It was found out that with increasing cooling rate the size of the γ' precipitates decreases and the mechanical properties of specimens increases. Also, it was shown that the shape and volume fraction of primary γ' particles are largely influenced by the cooling rate following solution treatment at 1210℃ for 4 h.

关键词: cast superalloy;solution heat treatment;cooling rate;microstructure;mechanical properties

HAN液晶盒中开关时间对形变场弛豫过程的影响

李晓吉 , 郑桂丽 , 张志东

液晶与显示 doi:10.3788/YJYXS20132801.0025

在HAN液晶盒撤掉外加电压的过程(即弛豫过程)中,假定电压的开关时间为有限的,把电压处理为时间的指数衰减函数.在这一假定下,对撤掉外加电压后HAN液晶盒中指向矢的分布情况进行研究,得到了对HAN液晶盒的弛豫过程有影响的电压开关时间的范围.

关键词: HAN液晶盒 , 有限开关时间 , 驰豫过程 , 动力学理论

电场诱导纳米结构HAN液晶盒中新型有序重构过程的描述

陈思博 , 王永超 , 周璇 , 张志东

液晶与显示 doi:10.3788/YJYXS20163109.0853

基于 Landau-de Gennes 理论，利用松弛迭代的方法，研究了包含－1/2向错线的混合排列(HAN)液晶盒中，平行于向错线的电场所诱导的结构转变。结果表明，盒厚固定时，电场诱导五种结构转变过程；电场固定时，盒厚变化产生三类结构转变方式。力曲线上的极小值确定了液晶系统发生结构转变的临界盒厚。

关键词: 有序重构 , Landau-de Gennes理论 , -1/2 向错 , 力曲线

HAN-IPS液晶盒的引流效应

郑桂丽 , 姜丽 , 张志东

液晶与显示 doi:10.3969/j.issn.1007-2780.2010.06.001

根据Erickson-Leslie流体动力学理论,研究了混合排列向列相-共面转换液晶盒的引流效应.在强锚定边界条件下,经过理论推导,得出液晶指向矢与流速的关系方程,进一步通过数值计算得出指向矢分布与时间的关系.发现引流效应加快了指向矢达到平衡态的速度,而且破坏了指向矢分布的瞬态对称性,特别在加电压的初始几毫秒这种现象非常明显.

关键词: 混合排列向列相 , 共面转换 , 引流效应 , 指向矢分布

Congratulations to Prof. Dr. WEI Shoukun's 100th Birthday

金属学报(英文版)

关键词:

Dedicated to Prof. Dr. WEI Shoukun's 100th birthday

稀有金属（英文版）

关键词:

ION HEATING PROCESS DURING PLASMA IMMERSION ION IMPLANTATION

X.B. Tian , X.F. Wang , A.G. Liu , L.P. Wang , S. Y. Wang , B. Y. Tang and P. K. Chu 1)Advanced Welding Production & Technology National Key Laboratory , Harbin Institute of Technology , Harbin 150001 , China 2)Department of Physics & Materials Science , City University of Hong Kong , China

金属学报(英文版)

The research on plasma immersion ion implantation has been conducted for a little over ten years. Much is needed to investigate including processing technlogy, plasma sheath dynamics, interaction of plasma and surface, etc. Of the processing methods elavated temperature technique is usually used in PIII to produce a thick modified layer by means of the thermal diffusion. Meanwhile plasma ion heating is more recently developed by Ronghua Wei et al[1]. Therefore the temeperature is a critical parameter in plasma ion processing. In this paper we present the theoretical model and analysize the effect of imlantation voltage, plasma density, ion mass,etc on the temperature rise.

关键词: plasma immersion ion implantation , null , null