Effects of longitudinal magnetic field on primary dendrite spacing and segregation of directionally solidified single crystal superalloy

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International Pub Date : 2024-02-01 DOI:10.1016/j.pnsc.2024.01.007

Congjiang Zhang , Yilin Zhou , Chen Shen , Weili Ren , Xiaotan Yuan , Biao Ding , Haibiao Lu , Zuosheng Lei , Yunbo Zhong , Ang Zhang

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引用次数: 0

Abstract

The primary dendrite spacing (PDS) and segregation of directionally solidified single crystal (SC) superalloy under the longitudinal magnetic field (LMF) were investigated based on the analysis of the whole cross-sectional microstructure at different solidification distances. The results show that the PDS under the LMF remains basically unchanged at different solidification distances, and it is greater than that under no LMF. With the increase of magnetic field intensity, the PDS increases and the macrosegregation decreases. The increasing PDS and reducing segregation under the LMF can be attributed to the increase of solute boundary layer, which expands the non-equilibrium freezing temperature range and brings the effective partition coefficient closer to 1. The increase of the solute enrichment layer thickness could be caused by the downward secondary circulation generated by the thermoelectric magnetic convection (TEMC) near the interface, which drives the migration of solutes towards the interdendritic region. This work not only clarifies the mechanism of LMF controlling PDS and reducing segregation by TEMC, but also provides theoretical guidance for producing high-quality SC superalloys using magnetic fields.

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纵向磁场对定向凝固单晶超耐热合金原生枝晶间距和偏析的影响

基于对不同凝固距离下整个截面微观结构的分析，研究了纵向磁场（LMF）作用下定向凝固单晶超耐热合金的原始枝晶间距（PDS）和偏析。结果表明，纵向磁场下的 PDS 在不同凝固距离下基本保持不变，且大于无纵向磁场下的 PDS。随着磁场强度的增加，PDS 增加，宏观偏析减少。LMF 下 PDS 增加和偏析减少的原因可能是溶质边界层增加，扩大了非平衡凝固温度范围，使有效分配系数更接近于 1；溶质富集层厚度增加的原因可能是界面附近的热电磁对流（TEMC）产生向下的二次环流，促使溶质向树枝间区域迁移。这项工作不仅阐明了 LMF 通过 TEMC 控制 PDS 和减少偏析的机理，还为利用磁场生产高质量 SC 超合金提供了理论指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Natural Science: Materials International 综合性期刊-综合性期刊

CiteScore

8.60

自引率

2.10%

发文量

2812

审稿时长

49 days

期刊介绍： Progress in Natural Science: Materials International provides scientists and engineers throughout the world with a central vehicle for the exchange and dissemination of basic theoretical studies and applied research of advanced materials. The emphasis is placed on original research, both analytical and experimental, which is of permanent interest to engineers and scientists, covering all aspects of new materials and technologies, such as, energy and environmental materials; advanced structural materials; advanced transportation materials, functional and electronic materials; nano-scale and amorphous materials; health and biological materials; materials modeling and simulation; materials characterization; and so on. The latest research achievements and innovative papers in basic theoretical studies and applied research of material science will be carefully selected and promptly reported. Thus, the aim of this Journal is to serve the global materials science and technology community with the latest research findings. As a service to readers, an international bibliography of recent publications in advanced materials is published bimonthly.