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形核驱动力
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  nuclear driving forces
     Calculation of γ-α Nuclear Driving Forces and Critical Nucleus Compositions of Alloy Steel
     合金钢γ-α转变形核驱动力及核心成分的计算
短句来源
     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
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  “形核驱动力”译为未确定词的双语例句
     A set of consistent parameters was obtained, on the base of which, intermetallic formation and its sequence between pure Sn and Ni substrate were predicted.
     在此基础上,利用最大形核驱动力模型预测纯Sn与基材Ni间界面反应中间化合物相生成的序列。
短句来源
     The total driving force for the decomposition of retained austensite and that of martensite, the driving force for nucleation of cementite, the growth rate as well as the incubation period of the formation of cementite that precipitates from martensite and austenite are evaluated.
     计算了残余奥氏体分解和马氏体分解的相变总驱动力,渗碳体自马氏体析出和自奥氏体析出的形核驱动力、长大速率和孕育期。
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。
短句来源
     the homogeneous nucleation undercooling of metal increases with the increasing of the metal dimensionless nucleation driving force coefficient in the condition that the ratio of the metal volume to the metal cooling rate is constant.
     在液态金属体积与冷却速度的比值一定时,金属的匀质形核过冷度随其形核驱动力因子的增大而增大
短句来源
     The driving force to nucleate and coarsening resistance for M2C is greater than any other carbides. Furthermore Co causes the markedly increase in the driving force to nucleate and nucleating coefficient for M2C.
     M2C比其他稳定碳化物具有更高形核驱动力和聚集抗力,Co提高这一驱动力和形核率。
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  相似匹配句对
     Calculation of γ-α Nuclear Driving Forces and Critical Nucleus Compositions of Alloy Steel
     合金钢γ-α转变形核驱动力及核心成分的计算
短句来源
     With the decrease of thetransformation temperature, the driving forces of ULCB transformation, nucleationand growth increase.
     随着转变温度的降低,ULCB相变、形核及长大的驱动力都增大;
短句来源
     The Driving forces behind the Veto Power in the UN Security Council—The Clash between National Interests and Human Interests
     安理会否决权的驱动力
短句来源
     (2) Driving forces on human being.
     (2)人文驱动力
短句来源
     NUCLEATION OF MARTENSITIC TRANSFORMATION
     马氏体相变的形核问题
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By application of the improved KRC model for determination of △G~(γ→α),the total driving forces for transformation and driving forces for growth(nucle-ation)for the several possible mechanisms of the bainitic transformation in Fe-Calloys,i.e.,γ→α+γ_1,γ→α+Fe_3C and γ→α′(the same composition)and α′→Fe_3C+α_B(the composition of the bainitic ferrite)are calculated.The driving forceof γ→α+Fe_3C is the largest,followed by that of γ→α+γ_1 and that of γ→α′isthe smallest.The driving force for growth of γ→α′is far less...

By application of the improved KRC model for determination of △G~(γ→α),the total driving forces for transformation and driving forces for growth(nucle-ation)for the several possible mechanisms of the bainitic transformation in Fe-Calloys,i.e.,γ→α+γ_1,γ→α+Fe_3C and γ→α′(the same composition)and α′→Fe_3C+α_B(the composition of the bainitic ferrite)are calculated.The driving forceof γ→α+Fe_3C is the largest,followed by that of γ→α+γ_1 and that of γ→α′isthe smallest.The driving force for growth of γ→α′is far less than that of γ→α+γ_1.At the temperature range of bainite formation,the driving force for γ→α′ismuch lower than that required for shear mechanism.The driving force for trans-formation of γ→α+γ_1 in 0.1—0.55 wt-%C alloys at B_s temperature is onlyabout -45 J·mol~(-1).At the upper limit temperature of bainite formation,the driv-ing force of γ→α′in 0.8 wt-%C alloy-is about 137 J·mol~(-1),and that of α′→α_B+Fe_3C is—527 J·mol~(-1).If cementite precipitates from the bainitic ferrite,thetotal driving force,i.e.,the sum of the driving forces of the above two processesis only about -390 J·mol~(-1).The above results show that the formation of thebainitie ferrite by shear mechanism is thermodynamically impossible.

以改进的KRC模型决定AG~(γ→α)的方法,计算了Fe-C合金贝氏体相变可能机制:γ→α+γ_1,γ→α+Fe_3C以及γ→α(浓度相同)和α′→α_B~″(贝氏体铁素体碳浓度)+Fe_3C的相变驱动力和长大(形核)驱动力.相变驱动力以γ→α+Fe_3C为最大,γ→α+γ_1次之,γ→α最小.由奥氏体转变成同成分铁素体(γ→α)的长大驱动力远小于γ→α+γ_1的长大驱动力.在贝氏体形成温度范围内,γ→α的驱动力远小于切变机制所需的驱动力.0.1—0.55wt,%C合金在B_s温度时γ→α+γ_1的相变驱动力仅约—45Jmol~(-1).0.8wt %C合金在贝氏体形成上限温度(823K)时γ→α的相变驱动力为137Jmol~(-1),而α→α+Fe_3C的相变驱动力为-527Jmol~(-1);两者相加,即在贝氏体铁素体析出渗碳体的情况下,相变总驱动力也仅有约-390Jmol~(-1).上述结果表明,贝氏体铁素体很难以切变机制形成和长大.

The total driving force for the decomposition of retained austensite and that of martensite, the driving force for nucleation of cementite, the growth rate as well as the incubation period of the formation of cementite that precipitates from martensite and austenite are evaluated. The results reveal that in spite of the fact that the driving force for the decomposition of martensite is one order of magnitude less than that of austenite, the driving force for the nucleation of cementite that precipitates from...

The total driving force for the decomposition of retained austensite and that of martensite, the driving force for nucleation of cementite, the growth rate as well as the incubation period of the formation of cementite that precipitates from martensite and austenite are evaluated. The results reveal that in spite of the fact that the driving force for the decomposition of martensite is one order of magnitude less than that of austenite, the driving force for the nucleation of cementite that precipitates from martensite is far greater than that from austenite and the incubation period of the formation of cementite as it precipitates from martensite is one order of magnitude less than that from austenite. It is obvious that during the short time tempering, cementite firstly precipitates from martensite, while upon tempering with long duration, since the total driving force for the decomposition of the retained austenite is greater and the contraction of martensite resulted from its decomposition would enhance the decomposition of interlath retained austenite, the precipitation of cementite from austenite leads the temper martensite embrittlement-Therefore, as the segregation of the impurities(and cementite) on the grain boundary is not taken into consideration, the mechanism of the TME may be assumed to be the combination of the two related decomposition processes.

计算了残余奥氏体分解和马氏体分解的相变总驱动力,渗碳体自马氏体析出和自奥氏体析出的形核驱动力、长大速率和孕育期。计算结果揭示:尽管奥氏体分解的驱动力大于马氏体分解约一个数量级,但渗碳体自马氏体析出的形核驱动力远大于自奥氏体的析出,长大速率约大两个数量级,孕育期比奥氏体析出的约小一个数量级。可见在低温短时回火时,渗碳体先从马氏体内析出;当回火时间较长时,由于奥氏体分解的相变总驱动力较大,以及由于马氏体条内析出渗碳体引起的收缩,促使条间残余奥氏体的分解,形成回火马氏体脆性。因此当不计及杂质(及渗碳体)在原始奥氏体晶界的偏聚对,回火马氏体脆性的机制应为这两个分解先后互相关联的过程。

Effect of pre-aging at room temperature and 150℃ on the precipitation of

通过电镜观察,研究了190℃人工时效前的室温和150℃预时效对8090和2091Al-Li合金中S’(Al_2CuMg)相析出的影响。实验结果表明,自然时效后人工时效的样品中由于空位凝聚而形成空位环,S’相在这些缺陷上优先形核长大。150℃的预时效由于增加形核驱动力而促进了S’相的析出,但影响效果不如自然时效明显。高的Cu,Mg含量有利于S’相的析出。本文讨论了S’相形成的微观机理。

 
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