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首页> 外文期刊>ISIJ international >Expressions for Solubility Products of Fe_3Nb_3C carbide and Fe_2Nb Laves Phase in Niobium Alloyed Ferritic Stainless Steels
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Expressions for Solubility Products of Fe_3Nb_3C carbide and Fe_2Nb Laves Phase in Niobium Alloyed Ferritic Stainless Steels

机译：Fe_3Nb_3C碳化物和Fe_2Nb Laves相在铌合金铁素体不锈钢中的溶解度表达式

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摘要

Precipitation behaviors in niobium alloyed ferritic stainless steels, which are widely used as heat resistant materials in automotive exhausts, were investigated. The solubility products of Fe_3Nb_3C and Fe_2Nb, both of which are prominent precipitates in such steels, were experimentally obtained. The expressions of the solubility products with mass percent are given by: Fe_3Nb_3C; log_(10){[Nb]~3[C]}=-11 613/T+ 5.2178 Fe_2Nb; log_(10)[Nb]= -3780.3/T+-2.4646. These were verified with some published experimental data. An attempt was also made to get thermodynamic parameters using the solubility products. The free energy changes for the precipitation reactions from niobium-supersaturated ferrite have been obtained. The expressions with mole fractions in ferrite matrix, e.g. x_(Nb)~(alpha beta), are given by: Fe_3Nb_3C (beta); DELTA G~(beta)= - 222 509- RT{6.423 + In(x_(Nb)~(alpha beta))~3(x_c~(alpha beta))} Fe_2Nb (omega); DELTA G~(omega)= -72 334-RT{0.5469 +In x_(Nb)~(alpha omega)}
机译：研究了广泛用作汽车尾气中耐热材料的铌合金铁素体不锈钢的沉淀行为。实验获得了Fe_3Nb_3C和Fe_2Nb的溶解度产物，它们都是此类钢中的主要析出物。以质量百分比表示的溶解度产物的表达式为：Fe_3Nb_3C; log_（10）{[Nb]〜3 [C]} =-11 613 / T + 5.2178 Fe_2Nb; log_（10）[Nb] = -3780.3 / T + -2.4646。这些已通过一些公开的实验数据进行了验证。还尝试使用溶解度产物获得热力学参数。已经获得了铌过饱和铁氧体沉淀反应的自由能变化。铁氧体基体中摩尔分数的表达式，例如x_（Nb）〜（alpha beta）由下式给出：Fe_3Nb_3C（beta）; ΔG_β=-222509-RT {6.423 + In（x_（Nb）〜αalpha））〜3（x_c〜αbeta）} Fe_2Nb（Ω）; DELTA G〜（ω）= -72 334-RT {0.5469 + In x_（Nb）〜（alphaω）}

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