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   heat 在 金属学及金属工艺 分类中 的翻译结果: 查询用时:0.023秒
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heat     
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  热量
    The results show that it is decreased by 34μm from 94 μm in average grain size of the alloy, and by 159.81J/g from 236.90J/g in the latent heat of fusion of the alloy after ultrasonic treatment, which reveals that the high intensity ultrasonic can remarkably improve the homogenization of the constituent and refine the grain size in the alloy.
    结果表明,试样晶粒平均尺寸由超声处理前的94μm减小到超声处理后的34μm; 合金试样的熔化吸热量由263.90J/g降低为159.81J/g,在熔体中施加高能超声显著改善了合金成分的均匀性并细化了晶粒。
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    However, when welding speed is higher than 2 m/min the low heat input is no longer an advantage since lack of penetration becomes a problem.
    然而,当焊接速度大于2m/min时,由于熔深不足的问题,低热量输入不再成为优点。
    A Surveyn on Modeling of Heat Transfer of Arc in MIG Arc Welding
    MIG焊接电弧热量传递数学模拟综述
短句来源
    Heat source and heat partition models of ELID grinding
    ELID镜面磨削热源和热量分配模型
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    The heat consumption is 577387kW/t, the electric energy consumption is12kW/t, the temperature of the exhausted gas is 100 ℃, all of them are prior to that of the same abroad.
    热再生装置的热量消耗为577387KJ/t,耗电量为12Kw/t,尾气排放温度为100℃,均优于国外同类产品。
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  加热
    Technology of Direct Boronizing Co-crystallization with Short-time Heat by Low Voltage and Strong Current
    低电压大电流短时加热直接渗硼共晶化工艺
短句来源
    Investigation on F201 Heat Protective Agent
    F201加热保护涂料的研究
短句来源
    CALCULATION OF ZONE HEATING FOR METAL BY ELEMENTARY HEAT BALANCE
    利用单元热平衡法计算金属局部加热
短句来源
    A Study of Temperature Gradient in Liquid Phase for Double-zone Heat Directional Solidification
    双区加热定向凝固液相温度梯度研究
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    Heat Cutting by Laser Beam
    激光加热切削
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  传热
    Study of Heat Transfer of Condensation on Vertical V-type Corrugated and Smooth Tubes with Drain-disks
    带有疏液盘的V型垂直沟槽管的冷凝传热研究
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    The Research of Mathematic Model and Simulation Algorithm for Continuous Casting Solidified Heat Transfer Process
    连续铸钢凝固传热过程数学模型及仿真算法研究
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    Method of Heat Transfer for Digital Simulation Large Steel Castings Solidfication
    大型铸钢件凝固数值模拟的传热学方法
短句来源
    Measuring Technology of Heat Transfer Coefficient for Nozzle in Secondary Cooling Zone of Continuous Casting
    连铸二冷喷嘴传热系数测试技术
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    On the Boundary Integral Equations for Quasi-steady Heat Transfer Problems of Welding
    焊接准稳态传热问题的边界积分方程解法
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  热处理
    Effects of Cyclic Heat Treatment on Microstructures and Mechanical Properties of TiAl-based Alloy
    循环热处理对TiAl基合金组织与性能的影响
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    Effect of Alloying, Heat Treatment and Magnetization Treatment on Microstructure and Electrochemical Properties of AB_5 Type Hydrogen Storage Electrode Alloy
    合金化、热处理及磁化处理对AB_5型贮氢电极合金微结构与电化学性能的影响
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    The Effect of Ag, Sc Alloying and Heat Treatment Processes on Microstructures and Properties of 7055 Aluminum Alloy
    Ag、Sc合金化及热处理工艺对7055铝合金的微观组织与性能影响研究
短句来源
    Influence of Heat Treatment on Fracture Toughness of Steel 35Cr3Mo3W2V
    热处理对35Cr3Mo3W2V钢的断裂韧性的影响
短句来源
    Heat Treatment and Strength-Ductility of Cr12MoV Steel Used for Cold-Working
    冷作模具钢Cr12MoV的热处理和强韧性
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  heat
As applications, the wave equation on?+ × ?+ and the heat equation in a semi-infinite rod are considered in detail.
      
In a much cited article, Yau [5] proved that when the Ricci curvature is bounded uniformly below, then the only bounded solution to the heat equation ?tμ=Δμ on [0, ∞) × M which vanishes at t=0 is the one which vanishes evarywhere.
      
Well-posedness of a semilinear heat equation with weak initial data
      
In the first part the initial value problem (IVP) of the semilinear heat equation with initial data in is studied.
      
For the analogs of the heat and wave equation, we give algorithms for approximating the solution, and display the results of implementing these algorithms.
      
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In the spectrochemical analysis of high speed steels with a small current activated a.c. arc (after Aбрамсон), the results of analysis were found to be affected by different previous heat-treatments given to the steel samples. To study this effect we selected 10 chromium steel samples of different carbon content. Spectrochemical analysis of these samples under different procedures of heat treatment shows that with an a.c. arc (5 amp.) the results of analysis of Cr for annealed and for hardened samples...

In the spectrochemical analysis of high speed steels with a small current activated a.c. arc (after Aбрамсон), the results of analysis were found to be affected by different previous heat-treatments given to the steel samples. To study this effect we selected 10 chromium steel samples of different carbon content. Spectrochemical analysis of these samples under different procedures of heat treatment shows that with an a.c. arc (5 amp.) the results of analysis of Cr for annealed and for hardened samples of the same steel are different and the difference increases with the increase of carbon content. We are inclined to think that in a low energy light source, the evaporation and the excitation of the alloying elements vary according to the existing form of carbon and this directly affects the results of spectrochemical analysis. The magnitude of this effect is different for different alloying elements, it is considerable in the case of Cr but is inappreciable in the case of Mn and Si.

我们用爱氏光源(低电流交流电弧)作高速钢的光谱分析时,发现样品的组织结构对于分析结果有影响。为了对这个现象得到进一步的了解,我们选择了10种含碳量不同的铬钢进行热处理试验和光谱分析。一系列实验的结果指出,用小电流(5安)电弧光源时,铬的光谱分析结果由于试样是退火组织或淬火组织而有差别,这个差别又随着钢中含碳量的增加而增加。我们认为,这种影响是由于碳在试样中存在状态的不同所引起的。在低功率光源中,这种不同使合金元素被蒸发和被激发的情况有所差别,因而就影响了光谱分析的结果。这种影响由于合金元素之不同而有程度上的不同,对铬的影响很显著,对锰和矽的影响则很小。此外,所选择的分析线对是弧线还是火花线,对于这种组织结构的效应也有显著的影响。 曾经进行了一些消除组织结构影响的实验。发现在应用低功率光源时,增加预燃时间并不能消除这个效应。用火花光源或大电流(8安)电弧光源时,这种影响大为减小。

The formation of Widmanst(a|¨)tten structure of alpha iron in hypoeutectoidsteels was investigated in 0.27,0.40,0.52 and 0.60% carbon steels.Specimenswere heated to 860° and 1240℃ in vacuo and cooled at different rates to roomtemperature or isothermally treated at various temperatures between 650° and750℃ in vacuo.It was shown that the Widmanst(a|¨)tten structure of alpha ironproduced in 0.27,0.40 and 0.52% carbon steels was always accompanied by asurface relief of the type associated with bainite transformation.The...

The formation of Widmanst(a|¨)tten structure of alpha iron in hypoeutectoidsteels was investigated in 0.27,0.40,0.52 and 0.60% carbon steels.Specimenswere heated to 860° and 1240℃ in vacuo and cooled at different rates to roomtemperature or isothermally treated at various temperatures between 650° and750℃ in vacuo.It was shown that the Widmanst(a|¨)tten structure of alpha ironproduced in 0.27,0.40 and 0.52% carbon steels was always accompanied by asurface relief of the type associated with bainite transformation.The surfacerelief was not observed when conditions were not favourable for the productionof Widmanst(a|¨)tten structure.The effects of various factors on the formation of Widmanst(a|¨)tten structure ofalpha iron are discussed.It is suggested that the absence of Widmanst(a|¨)ttenstructure in slowly cooled specimens,and in specimens with fine austenitic grains,is due to the formation of grain boundary ferrite,which enriches the remainingaustenite with carbon,thereby prevents the formation of carbon-free bainite.The experimental results showed that austenite may decompose by bainitetransformation at temperatures as high as 750℃.

试验证明亚共析钢中魏氏组织的α铁系以贝茵体型相变的机构形成,相当于无碳贝茵体。奥氏体晶粒尺度、碳含量、温度以及冷却速度对魏氏组织的影响都很容易根据贝茵体形成机构的理论加以解释。

In the previous paper,activities in liquid Fe-C alloys have been evaluatedfrom low carbon concentrations up to saturation with reference to pure liquidiron and solid graphite respectively as the standard states using Richardson andDennis' data on dilute solutions of carbon in liquid iron as the chief basis of cal-culation.Moreover,Smith's data on equilibrium between austenite and gaseousmixtures(CO_2/CO,CH_4/H_2)have been retreated to yield activities in austenitewith reference to pure γ iron and graphite respectively...

In the previous paper,activities in liquid Fe-C alloys have been evaluatedfrom low carbon concentrations up to saturation with reference to pure liquidiron and solid graphite respectively as the standard states using Richardson andDennis' data on dilute solutions of carbon in liquid iron as the chief basis of cal-culation.Moreover,Smith's data on equilibrium between austenite and gaseousmixtures(CO_2/CO,CH_4/H_2)have been retreated to yield activities in austenitewith reference to pure γ iron and graphite respectively as the standard states.The purpose of the present paper is to make a thermodynamic analysis of theiron-graphite equilibrium diagram on the basis of these activity data and certainother data including the free energy of cementite,the derivation of which will bediscussed in another paper of this series.Direct experimental data on the solubility of graphite in ferrite are not avai-lable.Darken and Gurry as well as Hillert calculated the solubility of graphitein ferrite from that of cementite in ferrite determined by a number of investi-gators and the free energy of cementite calculated by Darken and Smith.In the present paper,the solubility of graphite in ferrite has been recalculatedusing the free energy of cementite calculated by the author and the results arecompared with the values reported in the literature.Wells' data on iron-graphite eutectoid equilibrium have been found to beessentially compatible with thermodynamic requirements.The agreement betweenthe experimental and the calculated values can,however,be still improved if 735°instead of 738° is chosen as the eutectoid temperature.Regarding the iron-graphite eutectic,the condition for equilibrium demandsthat the activities of iron in austenite and an iron-carbon melt both saturatedwith graphite at the eutectic temperature should be equal if the same standard state is used.It has been found in the present paper that this condition can bebetter fulfilled if 10.83 cal./g.atom/deg.is chosen as the heat capacity of liquidiron and 3650 cal./g.atom as the heat of fusion of iron.From an analysis of the δ iron-austenite-liquid peritectic equilibrium,it hasbeen found that a peritectic temperature of 1495° and a liquid phase of 0.58%Care better than 1493° and 0.52%C reported by Adcock as well as 1499° and0.53%C calculated by Darken and Gurry.Finally,the liquidus and solidus curves of the austenite-liquid field have beencalculated,the latter being found to concave up slightly in contradiction withthe conventional Fe-C equilibrium diagram.

根据Smith测定及经作者修正的奥氏体内的活度及作者计算的液态铁碳合金内的活度与碳化铁的热力学函数以及其他必需的关于铁碳稳定平衡的实验及计算数据,作者对铁碳相图的稳定平衡部分作了较全面的分析。作者的计算包括:(i)石墨在铁素体內的溶解度;(ii)铁素体、奥氏体、石墨共析平衡;(iii)奥氏体、铁液、石墨共晶平衡;(iv)δ铁、奥氏体、铁液包晶平衡;(v)奥氏体、铁液二相区域的液相线及固相接。计算结果示于图3,此图与现行铁碳相图颇有不同之处。

 
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