共搜索到19157条信息,每页显示10条信息,共1916页。用时:0小时0分0秒812毫秒
; 要:研究热处理过程中不同冷却速率对镍基高温合金中γ′相析出的影响;采用Thermal-calc热力学计算,差热分析技术,确定新型镍基高温合金的γ′相完全固溶温度;采用有限元模拟,扫描电镜分析等方法,研究端淬梯度冷却过程中合金的温度场分布及γ′相析出和演化规律.结果表明:该合金γ′相完全固溶温度为1140 ℃,在端淬梯度冷却过程中,距离喷水端越远,冷却速度越低;随着冷却速度的逐渐减小,γ′析出相的.... 3 结论 1) 通过Thermal-Calc热模拟计算,差热分析实验分别得到新型镍基高温合金的γ′相完全溶解温度,两种实验结果基本一致,确定该新型镍基高温合金的γ′相完全溶解温度为(1145±5) ℃. 2) 在端淬过程中,随着冷却速度的增加,的平均尺寸逐渐减小,试样中的形貌由球形向方形逐渐转变,冷却速度较快时,长大过程中,化学自由能主要转变为应变能;冷却速度较慢时,长大过程中,化学......
......
by using a combined method of two steps for the electrolyzing and heat treatment without the use of the adhesive. The relationship between the synthesis condition and discharge performance... consisted of the mixture solution of 24 g/L of K2SO4 and a saturated solution of NH4VO3 at 40 ℃, and the current density on the graphite slice cathode is 0.3 mA/cm2; in the heat treatment step, a flow......
J. Cent. South Univ. (2020) 27: 1273-1289 DOI: https://doi.org/10.1007/s11771-020-4366-2 Effect of obstruction on thermal performance of solar water heaters LI Da-peng(李大鹏)1, WANG Yu-fan(王宇凡)1, LIU... and mitigating greenhouse gas emissions. However, the performance of SWH subjected to obstructions is unclear yet. In this study, we present a numerical evaluation on thermal performance of facade......
Effect of rare earth elements addition on thermal fatigue behaviors of AZ91 magnesium alloy Hossein Bayani1,Ehsan Saebnoori2 (1.Department of Materials Science and Engineering,Sharif University... addition on thermal fatigue behaviors of AZ91 alloy were studied. Repeated heating and cooling cycles were applied on the samples at 170 and 210 ℃ to develop thermal fatigue cracks. Crack growth......
A NEW TREATMENT FOR INTERFACE OF METAL ANDDIELECTRIC IN FDTD METHOD G.L.Jia1,J.C.He1,E.G.Wang1,B.W.Li1,Z.D.Qian1 (1.Key laboratory of National Education Ministry for Electromagnetic Processing of Materials, NortheasternUniversity, Shenyang 110006, China) Abstract:A new treatment for interface of metal and dielectric in finite-difference time domain(FDTD) method was presented, further how......
Structure, mechanical and thermal properties of BMI/E-44/CNTs ternary composites via amination methodYouliang Cheng,Bingbing Xia,Changqing Fang,Lu YangPackaging Engineering and Digital Media Technology, Xi’an University of Technology摘 要:Multi-walled carbon nanotubes(CNTs) were modified by an amination treatment with hexamethylenediamine(HMD......
: TiN film was prepared by heating treatment of titanium plates under N2 flow at 700 ℃, and IrO2-Ta2O5 coating was formed on the as-prepared Ti/TiN substrate by thermal decomposition method... can increase the life time of coating anodes prepared at temperature lower than 500 ℃. Key words: TiN film; IrO2-Ta2O5; coating; Ti anodes; electrocatalytic properties; heat treatment  ......
Fabrication and thermal performance of grooved-sintered wick heat pipeJIANG Le-lun(蒋乐伦)1, TANG Yong(汤勇)2, WU Hui-yue(武汇岳)3, ZHOU Wei(周伟)1, JIANG Lin-zhen(蒋琳珍)4(1. School of Engineering, Sun Yat-sen... forming and solid state sintering. The wick could be divided into two parts for liquid capillary pumping flow: groove sintered zone and uniform sintered zone. Both of the thermal resistance network......
for the dimensional stability of MMCs has been largely focused on the effect of heat treatments and thermal cycling treatments on them[7-11]. Obviously, the heat treatment processes is one of the main ways... reasons. One is that the aging treatment relaxes effectively the residual thermal mismatch stress in the metal matrix, which greatly affects mechanical properties of MMCs. The other reason......