The microstructure evolution and nucleation mechanisms of dynamic recrystallization in hot-deformed Inconel 625 superalloy
The microstructure evolution and nucleation mechanisms of dynamic recrystallization in hot-deformed Inconel 625 superalloy
复制标题
热变形Inconel 625高温合金的显微组织演变和动态再结晶形核机制
DOI：
10.1016/j.matdes.2010.07.040
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发表时间：
2011-02-01
影响因子：
8.4
通讯作者：
Wu, Zhigang
中科院分区：
文献类型：
--
作者：
Li, Defu;Guo, Qingmiao;Wu, Zhigang
使用Gleeble-1500模拟器在900 ℃和1200 ℃之间的不同应变下以0.1 s（-1）的应变速率进行Inconel 625高温合金的热压缩试验。利用光学显微镜、透射电镜和电子背散射衍射技术研究了动态再结晶的组织演变和形核机制。结果表明，随着变形温度的升高，动态再结晶晶粒的尺寸和比例均增大。而动态再结晶晶粒尺寸随变形量的增加几乎保持不变。Inconel 625高温合金在1150 ℃变形时，动态再结晶的主要形核机制是不连续动态再结晶，其特征是原始晶界的膨胀并伴有孪晶。在动态再结晶过程中，同时发生了以亚晶旋转为特征的连续动态再结晶，但它只能被看作是热变形早期的一种辅助形核机制。(C)2010爱思唯尔有限公司版权所有。
Hot compressions tests of Inconel 625 superalloy were conducted using a Gleeble-1500 simulator at different strains between 900 degrees C and 1200 degrees C with a strain rate of 0.1 s(-1). Optical microscope, transmission electron microscope and electron backscatter diffraction technique were employed to investigate the microstructure evolution and nucleation mechanisms of dynamic recrystallization. It was found that both the size and fraction of dynamically recrystallized grains increase with increasing deformation temperature. However, the size of dynamically recrystallized grains almost remains constant with increasing deformation strain. The dominant nucleation mechanism of dynamic recrystallization in Inconel 625 superalloy deformed at 1150 degrees C is the discontinuous dynamic recrystallization, which is characterized by the bulging of the original grain boundaries accompanied with twining. The continuous dynamic recrystallization characterized by progressive subgrain rotation occurs simultaneously in dynamic recrystallization process, although it can only be considered as an assistant nucleation mechanism at the early stage of hot deformation. (C) 2010 Elsevier Ltd. All rights reserved.