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临界核心
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  critical nucleus
     On the basis of Wagner's kinetic model, the compositions of critical nucleus and the nuclear driving forces of the precipitation of preutectoid ferrite in the conditions of equilibrium and para - equilibrium for polynary low-alloy steels, containing Mn, Si, Ni, Cr, Mo, Cu, V, Nb, W and Co (the total content<7%) , were calculated.
     采用Wagner的动力学模型,计算了含Mn,Si,Ni,Cr,Mo,Cu,V,Nb,W,Co等几种合金元素(合金含量<7%)的多元系低合金钢析出先共析铁素体平衡及仲平衡下的临界核心的成分和形核驱动力。
短句来源
     During the process that niobium carbide precipitated uniformly in ferrite, the shape of precipitate, critical nucleus size, rate of homogeneous nucleation in maximum, and the time of finishing precipitation have been estimated with the theories concerned, and the results of the estimation are consistent with the experimental data.
     利用有关理论估算出碳化铌在铁素体中均匀沉淀时的沉淀粒子形状、临界核心尺寸、均匀形核率、最大形核率温度和沉淀完成时间,试验结果与理论计算结果很好地符合。
短句来源
     In this paper, the critical nucleus composition of ferrite at maximum nucleation driving force and the composition of ferrite at phase equilibria between ferrite and austenite in Fe-Mn-C ternary alloys with or without austenite deformation are calculated by means of regular solution model respectively.
     本文在考虑奥氏体形变的情况下用规则溶液模型分别计算了Fe-Mn-C三元合金铁素体相在最大形核驱动力处的临界核心成分以及铁素体和奥氏体两相平衡时的成分。
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     Thermodynamics analysis shows that the external potential field cause the decrease of the activation energy, critical nucleus radius of crystal and the driving force, and the external potential field promotes the growth rate of new phase.
     理论分析表明 :外场使相转变激活能、临界核心半径和形核功下降 ,从而提高形核率 ,并对新相长大有促进作用。
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  相似匹配句对
     the core essential factors;
     核心要素;
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     Core Competitiveness
     核心竞争力
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     (M, H)-Critical Matrices
     (M,H)-临界矩阵
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     THE GAUSS -CRITICAL SUBMANIFOLDS
     高斯临界子流形
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     The Key Issues in the Technology Imports of Ultra-supercritical Pressure Large Size Thermal Power Generating Units
     超(超)临界大型火电机组技术引进中的核心问题分析
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  critical nucleus
The growth kinetics of new-phase clusters is considered starting from the moment of the critical nucleus formation.
      
The length of a two-dimensional critical nucleus has been measured, and the Gibbs-Thomson formula has been experimentally verified on orthorhombic lysozyme crystals.
      
The first regime (for a weak supersaturation) is characterized by the formation of a critical nucleus (critical nucleus regime).
      
The delay time is determined by the radius of the critical nucleus (CuCl nanomelt) and the diffusion coefficient of the limiting component, the Cu+ ions.
      
The radius of the critical nucleus is about 1 nm and does not vary within a broad temperature range.
      
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With three microalloy steels containing 0.24, 0.15, and 0.08% niobium respectively, the precipitation of niobium carbide in ferrite has been studied. During the process that niobium carbide precipitated uniformly in ferrite, the shape of precipitate, critical nucleus size, rate of homogeneous nucleation in maximum, and the time of finishing precipitation have been estimated with the theories concerned, and the results of the estimation are consistent with the experimental data. The conclusion derived in this...

With three microalloy steels containing 0.24, 0.15, and 0.08% niobium respectively, the precipitation of niobium carbide in ferrite has been studied. During the process that niobium carbide precipitated uniformly in ferrite, the shape of precipitate, critical nucleus size, rate of homogeneous nucleation in maximum, and the time of finishing precipitation have been estimated with the theories concerned, and the results of the estimation are consistent with the experimental data. The conclusion derived in this paper is of importance in theoretic study as well as in practice.

对铌含量分别为0.24、0.15和0.08%的三炉微合金化钢中碳化铌在铁素体中的沉淀进行了较为深入的研究。利用有关理论估算出碳化铌在铁素体中均匀沉淀时的沉淀粒子形状、临界核心尺寸、均匀形核率、最大形核率温度和沉淀完成时间,试验结果与理论计算结果很好地符合。由此而得的结论无论在理论方面还是在实际生产应用方面都具有重要的意义。

The precipitation of NbC in ferrite and its effect on the precipitation-strengthening of the microalloy steels containing 3 different percentages of Nb, i.e. 0.24, 0.15 and 0.08%, have been studied. The critical NbC nucleus size, the rate of homogeneous nucleation, the temperature of the maximum rate of homogeneous nucleation and the time for complete precipitation were estimated in agreement between the calculated and experimental results. The precipitation-strengtheningseems to have optimum effect on the steels...

The precipitation of NbC in ferrite and its effect on the precipitation-strengthening of the microalloy steels containing 3 different percentages of Nb, i.e. 0.24, 0.15 and 0.08%, have been studied. The critical NbC nucleus size, the rate of homogeneous nucleation, the temperature of the maximum rate of homogeneous nucleation and the time for complete precipitation were estimated in agreement between the calculated and experimental results. The precipitation-strengtheningseems to have optimum effect on the steels by isothermal precipitation for 1 h at about 600℃. Moreover, an improvement of the formula for the yield strength increment by the platelike NbC precipitates was also made. It is shown that, even the size of NbC precipitates down to 2.6nm, the mechanism of the precipitation-strengthening is still that of the Orowan's.

对NbC在含Nb(0.24,0.15和0.08%)的三种微合金化钢的铁素体中的沉淀和沉淀强化作用进行了研究,利用已有理论估算了NbC在铁素体中沉淀的临界核心尺寸、均匀形核率、最大形核率温度,大约在600℃等温沉淀可得到最为有效的沉淀强化效果。此外,修正了NbC粒子沉淀强化屈服强度增量公式,试验结果与公式计算符合较好。结果指出,当NbC粒子尺寸小到2.6nm时,沉淀强化机制仍为Orowan绕越机制。

In this paper, the critical nucleus composition of ferrite at maximum nucleation driving force and the composition of ferrite at phase equilibria between ferrite and austenite in Fe-Mn-C ternary alloys with or without austenite deformation are calculated by means of regular solution model respectively.The calculation results show that a certain difference exists in ferrite compositions under the two conditions above mentioned if there were no austenite deformation. The deformation of austenite promotes increase...

In this paper, the critical nucleus composition of ferrite at maximum nucleation driving force and the composition of ferrite at phase equilibria between ferrite and austenite in Fe-Mn-C ternary alloys with or without austenite deformation are calculated by means of regular solution model respectively.The calculation results show that a certain difference exists in ferrite compositions under the two conditions above mentioned if there were no austenite deformation. The deformation of austenite promotes increase the ferrite composition difference. The effect of austenite deformation on nucleation rate of ferrite is discussed with classical nucleation theory as well.

本文在考虑奥氏体形变的情况下用规则溶液模型分别计算了Fe-Mn-C三元合金铁素体相在最大形核驱动力处的临界核心成分以及铁素体和奥氏体两相平衡时的成分。计算结果表明:在无奥氏体形变时,上述两种情况下的铁素体成分之间存在着一定的差别,而奥氏体的形变使得这种差别增大。最后在经典形核理论的前提下讨论了奥氏体形变对铁素体形核率的影响。

 
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