Quasi-stoichiometric coarsening of f.c.c. carbides in microalloyed austenite containing niobium and vanadium
Quasi-stoichiometric coarsening of f.c.c. carbides in microalloyed austenite containing niobium and vanadium
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f.c.c. 的准化学计量粗化
DOI：
10.1016/0921-5093(93)90404-3
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
P. R. Rios
中科院分区：
文献类型：
--
作者：
P. R. Rios
研究了奥氏体中NaCl型（NbxV 1 −x）C碳化物的粗化。结果表明，为了调和两个方程的碳化物生长，即一个铌和另一个钒控制的增长，碳化物的组成必须取决于它的大小。原则上，这将使经典的Lifshitz-Slyozov-瓦格纳（LSW）粗化方法失效。然而，它表明，从平衡组成的碳化物成分的偏差可能是小的，这取决于温度，合金含量和平均碳化物半径。因此，有人建议，在这种情况下，碳化物可以被视为“准化学计量”，它表明，LSW方法可以因此应用。虽然目前的工作集中在（NbC）x（VC）1−x上，但其结果相当普遍，原则上可以应用于类似的系统，即非化学计量的、微溶的PxQ 1 −x化合物，在元素M的矩阵中粗化。
The coarsening of NaCl-type (NbxV1−x)C carbides in austenite is examined. It is shown that, to reconcile the two equations for carbide growth, namely one for niobium and another for vanadium-controlled growth, the carbide composition must depend on its size. In principle this would invalidate the classical Lifshitz-Slyozov-Wagner (LSW) approach to coarsening. It is demonstrated, however, that the deviation of the carbide composition from the equilibrium composition may be small, depending on the temperature, alloy content and mean carbide radius. Therefore, it is proposed that, in such cases, the carbides can be regarded to be “quasi-stoichiometric” and it is shown that the LSW method can thus be applied. Although the present work focuses on (NbC)x(VC)1−x, its results are quite general and, in principle, can be applied to similar systems, namely non-stoichiometric, sparingly soluble compounds of PxQ1−x, coarsening in a matrix of an element M.