Morphology of interphase precipitation in microalloyed steels
Morphology of interphase precipitation in microalloyed steels
复制标题
微合金钢中相间沉淀的形貌
DOI：
10.1007/bf00722153
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
P. R. Rios
中科院分区：
文献类型：
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作者：
P. R. Rios
大量的实验努力已经投入到相间沉淀中所涉及的相的性质、晶体学和生长机制的精确测定中[2，3，5-8]。相对较少的工作致力于阐述定量模型来解释形态，即相间沉淀的突出部分高度和沉淀物尺寸[9-12]。这封信报道了一个简单的凸缘高度和碳化物尺寸之间的关系，基于对已发表的数据的现象学分析，在钢中含有最常见的微合金化元素：Nb，V和Ti的相间析出的形态。相间析出发生的凸缘的迁移。然而，人们经常观察到，“一列”壁架一起迁移，使得阶梯状界面在壁架移动的方向上迁移。在许多合金中发现了这方面的实验证据[1，2，5，6，13-15]。图1中示出了在700 C下部分转变的Fe-10 wt% Cr-0.2 wt% C钢的这种情况[16]。可以看出，晶界形核组元通过台阶界面的迁移长大。这种情况的示意图如图2所示。碳化物的尺寸被拉得越来越小，
Considerable experimental effort has been put into the precise determination of the nature, crystallography and growth mechanism of the phases involved [2, 3, 5-8] in interphase precipitation. Comparatively little work has been been devoted to the elaboration of quantitative models to account for the morphology, ie the ledge height and precipitate size of interphase precipitation [9-12]. This letter reports a simple relationship between ledge height and carbide size, based on a phenomenological analysis of published data on the morphology of interphase precipitation in steels containing the most common microalloying elements: Nb, V and Ti.Interphase precipitation takes place by the migration of ledges. Often, however, one observes that" trains" of ledges migrate together so that the stepped interface migrates in the direction of ledge movement. Experimental evidence of this is found in many alloys [1, 2, 5, 6, 13-15]. Such a situation is illustrated in Fig. 1 for an Fe-10 wt% Cr-0.2 wt% C steel partially transformed at 700 C [16]. It can be seen that the grain boundary-nucleated constituent grows by the migration of a stepped interface. A schematic view of such a situation is shown in Fig. 2. The carbides are drawn decreasing in size as