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  homogeneous nucleation
The accuracy of the suggested approximation is tested for the limiting cases of homogeneous nucleation and nucleation at centers of the same type.
      
The proposed theory is extended to the case of homogeneous nucleation in the vapor-gas medium.
      
Statistical Characteristics of the Process of Homogeneous Nucleation in the Vapor-Gas Medium during Free Molecular Regime of the
      
Statistical Approach to the Account of Metastable Phase Depletion in the Kinetics of Homogeneous Nucleation in the Vapor-Gas Med
      
Statistical Approach to the Description of Homogeneous Nucleation in the Vapor-Gas Medium: Effects of the Heat of Phase Transiti
      
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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。

The hot deformation behaviour and microstructure change of a Cr25 Ti

在1100℃和应变速率5×10~(-2)s~(-1)条件下对Cr25Ti铁素体钢进行热变形模拟试验,有动态再结晶发生.在变形早期有少部分晶界形核,随后均匀形核.较强的动态回复促使形成大量完好亚晶,变形诱发亚晶转动和亚晶界合并形成新晶粒.观察到原晶粒中的亚晶不断倾转弯曲或扭转形成再结晶晶粒间的位向关系.这表明此合金动态再结晶的形核方式与某些矿物类似,主要以应变诱发亚晶逐渐转动而均匀形核.这种较大程度的不同时性形核,使动态再结晶的应力峰不明显.

 
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