A New Method to Increase the Spheroidization Rate of Lamellar α Microstructure during Hot Deformation of a Ti–6Al–4V Alloy,Advanced Engineering Materials

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A New Method to Increase the Spheroidization Rate of Lamellar α Microstructure during Hot Deformation of a Ti–6Al–4V Alloy
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-06-03 , DOI: 10.1002/adem.202000447
Yu-Qiang Jiang ₁ , Y. C. Lin _{1,

2} , Chun-Yang Zhao ₁ , Ming-Song Chen ₁ , Dao-Guang He ₁

Affiliation

Ti–6Al–4V is one of the important materials for manufacturing critical components of aero‐engines. The excellent service properties of aero‐engines are dependent on components and their material microstructures. The spheroidization of a lamellar α microstructure is one of the important methods to refine grains in Ti alloys. Herein, a new method is proposed to increase the spheroidization rate of the lamellar α microstructure during hot deformation of a Ti–6Al–4V alloy. The spheroidization behaviors of the lamellar α microstructure are investigated by one‐pass and two‐pass hot compression tests. A special spheroidization behavior, which is defined as metadynamic spheroidization, is found during inter‐pass; i.e., the lamellar α phase breaks up during the inter‐pass due to the migration and transformation of sub‐boundaries. The spheroidization rate of the lamellar α phase is increased by the metadynamic spheroidization mechanism. The effects of inter‐pass holding time, pre‐strain, and total strain on the spheroidization rate are obvious. Furthermore, the spheroidization rate of lamellar α phases by two‐pass compression is approximately 30% higher than that by one‐pass compression for a given total strain of 1.2. In addition, the strains for the completed spheroidization can be effectively reduced by two‐pass isothermal compression.

中文翻译：

Ti-6Al-4V合金热变形过程中提高层状α显微组织球化率的新方法

Ti-6Al-4V是制造航空发动机关键组件的重要材料之一。航空发动机的优良服务性能取决于部件及其材料的微观结构。层状α微观结构的球化是提纯Ti合金晶粒的重要方法之一。在此，提出了一种新的方法来提高Ti-6Al-4V合金热变形过程中层状α微观组织的球化率。通过一遍和两遍热压缩试验研究了层状α微结构的球化行为。中间通过时发现了一种特殊的球化行为，称为亚动力学球化。即层状α由于子边界的迁移和转换，相交期间相位会中断。层状α相的球化率通过亚动力学球化机制而增加。道间保持时间，预应变和总应变对球化率的影响是显而易见的。此外，在给定的总应变为1.2的情况下，两次通过压缩的层状α相的球化率比一次通过压缩的球化率高约30％。此外，通过两次等温压缩可以有效地减小完成球化的应变。

更新日期：2020-06-03

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