Numerical Simulation of Thermal Fields and Microstructure Evolution in SLM of Fe32Cr33Ni29Al3Ti3 Alloy
Xuyun Peng, Xiaojun Tan, Haibing Xiao, Wei Zhang, Liang Guo, Wei Tan, Jian Huang, Chaojun Ding, Yushan Yang, Jieshun Yang, Haitao Chen, Qingmao Zhang
TL;DR
This study uses simulations and experiments to understand how laser power affects the microstructure of a high-entropy alloy during 3D printing.
Contribution
The paper is among the first to quantitatively link thermal histories with dual-phase microstructure evolution in eutectic high-entropy alloys during SLM.
Findings
Higher laser power increases FCC phase fraction and melt pool depth in Fe32Cr33Ni29Al3Ti3 EHEAs.
BCC grains are finer than FCC grains, and their content correlates with thermal residence time in a specific temperature range.
Thermal simulations and EBSD analysis reveal phase evolution tied to laser parameters and temperature gradients.
Abstract
Fabricating eutectic high-entropy alloys (EHEAs) via selective laser melting (SLM) presents significant potential for advanced structural applications. This study explores the microstructural evolution of Fe32Cr33Ni29Al3Ti3 EHEAs fabricated by SLM under varying laser powers. Electron backscatter diffraction (EBSD) analysis revealed that samples fabricated at 200 W exhibited approximately 70% face-centered-cubic (FCC) and 30% body-centered-cubic (BCC) phases. In comparison, those processed at 160 W showed an increased FCC fraction of 85% with a corresponding reduction in BCC content. Grain size measurements indicated that BCC grains were consistently finer than their FCC counterparts. Thermal simulations demonstrated that higher laser power produced deeper melt pools and broader temperature gradients. By correlating thermal history with phase diagram data, the spatial variation in BCC…
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Taxonomy
TopicsHigh Entropy Alloys Studies · Additive Manufacturing Materials and Processes · Intermetallics and Advanced Alloy Properties