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   diffusion of hydrogen 的翻译结果: 查询用时:0.168秒
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diffusion of hydrogen
相关语句
  氢扩散
     With time of charging , the concentration of TiH2 onthe surface increases, instead the diffusion of hydrogen becomes more difficultly.
     TiH_2的生成对氢的渗入有一定的抑制作用,随着充氢时间的延长,表面TiH_2的浓度增加,氢扩散的速度也逐渐减小。
短句来源
     It is suggested that the mechanism of hydrogen induced delayed cracking is the diffusion of hydrogen upa stress gradient to form hydride precipitate at crack tip.
     通过试验分析得出Ti55电子束焊缝氢致延迟裂纹产生的机理为在裂纹尖端处应力诱导氢扩散导致氢化物析出所致。
短句来源
     The low-temperature performances of the alloys are controlled by the diffusion of hydrogen.
     贮氢合金的低温性能受氢扩散控制.
  “diffusion of hydrogen”译为未确定词的双语例句
     The Diffusion of Hydrogen in Metal Glass Fe_(39)Ni_(39)Si_8B_(12)Mn_2 and the Effect of Hydrogen on its Young's Modulus
     氢在金属玻璃Fe_(39)Ni_(39)Si_8B_(12)Mn_2中的扩散及其对弹性模量的影响
短句来源
     Adsorption and Diffusion of Hydrogen Atom on Pd(997) Step Surface
     氢原子在Pd(997)台阶面上的吸附和扩散
短句来源
     DIFFUSION OF HYDROGEN IN (α+γ) DUPLEX STAINLESS STEEL
     氢在(α+γ)双相不锈钢中的扩散
短句来源
     DIFFUSION OF HYDROGEN IN ELECTRO-DEPOSITED Ni-P AMORPHOUS ALLOYS
     电沉积Ni-P非晶合金中氢的扩散
短句来源
     DIFFUSION OF HYDROGEN IN Ta
     氢在Ta中的扩散
短句来源
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  相似匹配句对
     DIFFUSION OF HYDROGEN IN Ta
     氢在Ta中的扩散
短句来源
     HYDROGEN SOLUTION AND DIFFUSION IN GRAPHITE
     氢在石墨中的溶解扩散及渗透过程研究
短句来源
     Diffusion of Hydrogen in Metals and Alloys
     氢在金属及合金中的扩散
短句来源
     PREDICTION OF SUPERSONIC HYDROGEN DIFFUSION FLAME
     氢气在空气中超音速扩散燃烧理论计算
短句来源
     A Study of Hydrogen Diffusion in Steel
     氢在钢中扩散过程的研究
短句来源
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  diffusion of hydrogen
The effect of sulfate-reducing bacteria on the diffusion of hydrogen through a membrane of St3 type steel is considered, both at the free-corrosion potential and under cathodic and anodic polarization.
      
Initially, it is limited by an electrochemical stage and, then, by the diffusion of hydrogen from the solid phase.
      
Diffusion of hydrogen through a steel membrane from ethylene glycol solutions of HCl containing 0.1-10 wt % H2O is studied.
      
The process of interaction with water vapor is shown to be limited by the intraphase diffusion of hydrogen-and oxygen-containing species that enter the composition of H2O.
      
Entropy characteristic of solvation and thermal diffusion of hydrogen chloride in water-1-propanol solutions: A thermoelectroche
      
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Internal friction peaks associated with the presence of hydrogen in eight types of high chromium-nickel alloy steel were observed in measurements with a torsion pendulum. The optimum temperature for maximum internal friction lies between 610-640℃ for a frequency of vibration of about 1.5 cycles per second. Systematic investigations were made with specimens containing 18% of Cr and 12% of Ni. The elementary process for this internal friction peak was found to be a relaxation process, associated with an activation...

Internal friction peaks associated with the presence of hydrogen in eight types of high chromium-nickel alloy steel were observed in measurements with a torsion pendulum. The optimum temperature for maximum internal friction lies between 610-640℃ for a frequency of vibration of about 1.5 cycles per second. Systematic investigations were made with specimens containing 18% of Cr and 12% of Ni. The elementary process for this internal friction peak was found to be a relaxation process, associated with an activation energy of about 46,000-50,000 calories per mole. Judging from the value of this activation energy, as well as from the behavior of the internal friction peak when the measurements were taken while the temperature was raised, lowered and kept constant, the conclusion was reached that the new internal friction peak is associated with the stress-induced micro-diffusion of hydrogen molecules in high alloy steels.

用扭摆作内耗测量,发现八种高铬镍合金钢中含氢可以引起内耗峰。当振动频率约为每秒1.5周时,内耗峰的巅值温度在610—640℃附近。用其中一种高铬镍合金钢试样(18Cr 12Ni)进行了系统的实验,指出这个内耗峰的基元过程是一种弛豫过程,所包含的激活能约为46,000—50,000卡/克分子。根据激活能的数值以及内耗峰在升温、降温和保温时的变化情况,可以认为这个新内耗峰是由於氢分子在钢中微扩散所引起来的。 内耗测量的结果也指出了在18Cr 12Ni钢中在特定的升温、降温速度下氢分子舆氢原子的转变温度范围,所得的结果舆资料上的相合。

The kinetics of hydrogen absorption in LaNi_5 has been investigated at initialpressures of 15--30 atm and temperatures in the range of 20--85℃. LaNi_5 was pre-pared in a ZrO_2 crucible in a graphite-tube furnace under vacuum. It is shownthat a linear relationship exists between the amount of hydrogen absorbed, W,and the time of reaction on a logarithmic scale and the rate of hydrogen absorp-tion depends on the initial pressure and the test temperature. The P-X-T curves of the LaNi_5 system have been determined....

The kinetics of hydrogen absorption in LaNi_5 has been investigated at initialpressures of 15--30 atm and temperatures in the range of 20--85℃. LaNi_5 was pre-pared in a ZrO_2 crucible in a graphite-tube furnace under vacuum. It is shownthat a linear relationship exists between the amount of hydrogen absorbed, W,and the time of reaction on a logarithmic scale and the rate of hydrogen absorp-tion depends on the initial pressure and the test temperature. The P-X-T curves of the LaNi_5 system have been determined. For each testtemperature there is a corresponding pressure plateau P_0 and it is therefore as-sumed that for every initial pressure P_0 there is a corresponding balance temperatureT_0, and T_0-T may be taken as the driving force of hydrogen absorption processin LaNi_5 at initial pressure P_0 and test temperature T. The absorption of hydro-gen takes place in three steps: (1) surface reaction, which seems to be rather com-plicated; (2) diffusion of hydrogen atoms and (3) phase transformation f LaNi_5 toa hydride phase. All these steps are thermal activation processes, and thereforethe e~(-U/RT) can be introduce in the hydrogen absorption process. The relatioshipbetween the absorption rate, the initial pressure, the test temperature and time isgiven as follow: dW/dt=A_0(T_0-T)e~(-U/RT)·1/tThe activation energy of the rate limiting step U is about 2 or 3.2 kcal/molaccording to whether the amount of hydrogen absorbed is less or more than 70%respectively. The parameter U of the rate-limiting step during hydrogen absorptionin LaNi_5 can be obtained as shown by our experiments.

在初始压力15—30atm、温度20—85℃的范围内研究了储氢材料LaNi_5在恒温时吸氢的动力学过程.实验结果表明:吸氢量与时间的对数呈线性关系;吸氢速率随初始压力的提高或吸氢温度的升高而改变.提出了表示吸氢速率对时间、初始压力、吸氢温度依赖性的关系式,实验结果与之一致.按这一关系式可以得到吸氢速率的限制性环节的激活能U.在吸氢量(以饱和度计)约70%以前,U约为2.0 kcal/mol H_2,吸氢量更高时约3.2 kcal/mol H_2.这些数据为进一步确定吸氢速率的限制性环节提供了重要参数.

Rate controlling processes for hydrogen enhanced crack growth in hydrogen, in water and in hydrogen sulfide have been identified for an AISI 4340 steel(tempered at 204℃). For environment-st(?)el system with slow reaction kinetics, e. g., hydrogen-stee Ⅰ and water-steel, crack growth is controlled by the surface reaction. For environment-steel sy(?)tem with fast reaction kinetics, e. g., hydorgen sulfide-steel, the rate controlling process for crack growth is either that of gas phase transport or diffu(?)ion....

Rate controlling processes for hydrogen enhanced crack growth in hydrogen, in water and in hydrogen sulfide have been identified for an AISI 4340 steel(tempered at 204℃). For environment-st(?)el system with slow reaction kinetics, e. g., hydrogen-stee Ⅰ and water-steel, crack growth is controlled by the surface reaction. For environment-steel sy(?)tem with fast reaction kinetics, e. g., hydorgen sulfide-steel, the rate controlling process for crack growth is either that of gas phase transport or diffu(?)ion. At low pressures, the crack growth rate is determined by the rate of transport of gas to the region near the crack tip. At high pressures, the crack growth rate is determined by the rate of diffusion of hydrogen to the embrittling sites adhead of crack tip. The results are discussed in. terms of fracture mechanics experiments, measured surface reaction kinetics, fractographic analysis and data on diffusion, and in relation to models for crack growth.

本文指出AISI 4340钢(204℃回火)在蒸镏水、氢气和硫化氢中氢致裂纹扩展可能的控制步骤。在介质与钢表面反应较慢时,例如在水或氢气中,此阶段裂纹扩展率是受到表面反应所控制.在介质与钢表面反应较快时,例如在硫化氢中,控制步骤在低气压时是气体传播到裂纹尖端;高气压时是氢原子由裂纹表面扩散到脆化区.这种扩展率控制步骤的指证是考虑了断裂力学实验,表面反应动力学、断口分析和氢扩散数据,以及相关的裂纹扩展模型的一致性.

 
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