了解通过非平衡激光加工制造的快速凝固二元钛-X合金中的溶质偏析和再分布行为

IF 10.3 1区 工程技术 Q1 ENGINEERING, MANUFACTURING
Zimeng Ye , Kexin Zhao , Zerong Yu , Konda Gokuldoss Prashanth , Fengying Zhang , Yuqi He , Yijie Peng , Wenlu Wu , Hua Tan
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引用次数: 0

摘要

在使用激光增材制造(LAM)工艺进行非平衡快速凝固过程中,溶质的偏析和再分布会直接影响微观结构形态和相分布,进而影响其机械性能。在这项工作中,采用了激光微合金化策略,以保留所考虑的 Ti-9Mo 、Ti-9Cr、Ti-9Fe 和 Ti-9Ni (wt%) 合金的原始凝固微观结构。添加不同的 β 稳定元素(钼、铬、铁和镍)会产生不同的微观结构:Ti-9Mo 和 Ti-9Cr 合金表现出较大的晶粒(∼502 μm 和 ∼733 μm)和蜂窝状形态,这是由于固-液界面的受控过冷度最小。由于显微过冷度增加,Ti-9Fe 晶粒明显细化(∼398 μm),呈现出树枝状形态,初级树枝状枝臂拉长。钛-9Ni表现出最高的组织过冷度,形成等轴枝晶。然而,由于树枝晶间共晶相 Ti2Ni 消耗了大量溶质原子,晶粒没有进一步细化(∼396 μm)。结合温度场模拟,确定了合金的凝固条件。此外,基于溶质分配系数(k),阐明了 k > 1 的 Ti-9Mo 和 k < 1 的 Ti-9Cr 在激光微合金化过程中固液界面上不同的溶质再分配和扩散行为,为 Ti-9Mo 合金中典型蜂窝形貌的形成和 Mo 富集现象的增强提供了重要见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Understanding the solute segregation and redistribution behavior in rapidly solidified binary Ti-X alloys fabricated through non-equilibrium laser processing
The solute segregation and redistribution during non-equilibrium rapid solidification using laser additive manufacturing (LAM) process directly influence the microstructure morphology and phase distribution, which in turn affects their mechanical properties. In this work, a laser micro-alloying strategy was utilized to preserve the original solidification microstructure in the considered Ti-9Mo, Ti-9Cr, Ti-9Fe, and Ti-9Ni (wt%) alloys. The addition of different β-stabilizing elements (Mo, Cr, Fe, and Ni) resulted in distinct microstructures: Ti-9Mo and Ti-9Cr alloys exhibited larger grains (∼502 μm and ∼733 μm) and cellular morphologies due to minimum constitutional undercooling at the solid-liquid interface. Because of the increased constitutional undercooling, the Ti-9Fe grains are significantly refined (∼398 μm), showing a dendritic morphology with elongated primary dendrite arms. Ti-9Ni exhibited the highest constitutional undercooling, forming equiaxed dendrites. However, due to the significant consumption of solute atoms by the interdendritic eutectic phase Ti2Ni, the grains did not further refine (∼396 μm). Combined with the temperature field simulation, the solidification conditions of the alloys were determined. In addition, based on the solute partitioning coefficients (k), the different solute redistribution and diffusion behaviors at the solid-liquid interface during the laser micro-alloying process of Ti-9Mo with k > 1 and Ti-9Cr with k < 1 were elucidated, providing essential insights into the formation of typical cellular morphology and enhanced Mo enrichment phenomenon in the Ti-9Mo alloy.
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来源期刊
Additive manufacturing
Additive manufacturing Materials Science-General Materials Science
CiteScore
19.80
自引率
12.70%
发文量
648
审稿时长
35 days
期刊介绍: Additive Manufacturing stands as a peer-reviewed journal dedicated to delivering high-quality research papers and reviews in the field of additive manufacturing, serving both academia and industry leaders. The journal's objective is to recognize the innovative essence of additive manufacturing and its diverse applications, providing a comprehensive overview of current developments and future prospects. The transformative potential of additive manufacturing technologies in product design and manufacturing is poised to disrupt traditional approaches. In response to this paradigm shift, a distinctive and comprehensive publication outlet was essential. Additive Manufacturing fulfills this need, offering a platform for engineers, materials scientists, and practitioners across academia and various industries to document and share innovations in these evolving technologies.
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