Mechanism analysis of grain growth dominated by alloy composition gradients during powder bed fusion

IF 8.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Letters Pub Date : 2023-09-01 DOI:10.1080/21663831.2023.2250826

Liming Yao, Zhongmin Xiao, Zhiongsheng Hoo, Chao Tang, Jing Qiao, Yanmei Zhang

引用次数: 1

Abstract

A multi-physics simulation model has been established to investigate the influence of Laser powder bed fusion parameters on the spatial composition distribution and grain growth mechanism of the single-track printed dissimilar alloys. Our study shows that alloy composition gradient isosurfaces can be used to visualize the spatial distribution of alloy composition for miscible dissimilar alloys. When the melt pool aspect ratio changes from large to small, the grain growth transitions from the temperature gradient mode to composition gradient mode and then to the mixed mode. Our experimental observations show that in extreme cases, the curved grain angle can reach 272°. GRAPHICAL ABSTRACT IMPACT STATEMENT The study found that the composition gradient of dissimilar alloys can dominate grain growth, which is entirely different from the conventional temperature gradient-dominated grain growth mechanism.

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粉末床熔合过程中合金成分梯度主导晶粒长大的机理分析

建立了一个多物理模拟模型，研究了激光粉末床聚变参数对单轨印刷异种合金空间成分分布和晶粒生长机制的影响。我们的研究表明，合金成分梯度等值面可以用于可视化可混溶的不同合金的合金成分的空间分布。当熔池长宽比由大变小时，晶粒生长从温度梯度模式转变为成分梯度模式，然后转变为混合模式。我们的实验观察表明，在极端情况下，弯曲晶粒的角度可以达到272°。图形摘要影响声明研究发现，不同合金的成分梯度可以主导晶粒生长，这与传统的温度梯度主导晶粒生长机制完全不同。

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

Materials Research Letters Materials Science-General Materials Science

CiteScore

12.10

自引率

3.60%

发文量

审稿时长

3.3 months

期刊介绍： Materials Research Letters is a high impact, open access journal that focuses on the engineering and technology of materials, materials physics and chemistry, and novel and emergent materials. It supports the materials research community by publishing original and compelling research work. The journal provides fast communications on cutting-edge materials research findings, with a primary focus on advanced metallic materials and physical metallurgy. It also considers other materials such as intermetallics, ceramics, and nanocomposites. Materials Research Letters publishes papers with significant breakthroughs in materials science, including research on unprecedented mechanical and functional properties, mechanisms for processing and formation of novel microstructures (including nanostructures, heterostructures, and hierarchical structures), and the mechanisms, physics, and chemistry responsible for the observed mechanical and functional behaviors of advanced materials. The journal accepts original research articles, original letters, perspective pieces presenting provocative and visionary opinions and views, and brief overviews of critical issues.