Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Effects of Heat Treatment on the Microstructure and Mechanical Properties of a Dual-Phase High-Entropy Alloy Fabricated via Selective Laser Melting

Xiaojun Tan
ORCID logo ,
Zihong Wang
,
Haitao Chen
,
Xuyun Peng
,
Wei Zhang
,
Haibing Xiao
* ORCID logo ,
Zhongmin Liu
,
Yu Hu
,
Liang Guo
* ,
Qingmao Zhang
Version 1 : Received: 6 February 2024 / Approved: 7 February 2024 / Online: 7 February 2024 (08:08:56 CET)

A peer-reviewed article of this Preprint also exists.

Tan, X.; Wang, Z.; Chen, H.; Peng, X.; Zhang, W.; Xiao, H.; Liu, Z.; Hu, Y.; Guo, L.; Zhang, Q. Effects of Heat Treatment on the Microstructure and Mechanical Properties of a Dual-Phase High-Entropy Alloy Fabricated via Laser Beam Power Bed Fusion. Micromachines 2024, 15, 471. Tan, X.; Wang, Z.; Chen, H.; Peng, X.; Zhang, W.; Xiao, H.; Liu, Z.; Hu, Y.; Guo, L.; Zhang, Q. Effects of Heat Treatment on the Microstructure and Mechanical Properties of a Dual-Phase High-Entropy Alloy Fabricated via Laser Beam Power Bed Fusion. Micromachines 2024, 15, 471.

Abstract

To enhance the applicability of dual-phase high-entropy alloys (HEAs) like Fe32Cr33Ni29Al3Ti3, fabricated via selective laser melting (SLM), a focus on improving their mechanical properties is essential. As part of this effort, heat treatment was explored. This study compares the microstructure and mechanical properties of the as-printed sample with those cooled in water after undergoing heat treatment at temperatures ranging from 1000 to 1200 ℃ for 1 hour. Both pre- and post-treatment samples reveal a dual-phase microstructure comprising FCC and BCC phases. Although heat treatment led to a reduction in tensile and yield strength, it significantly increased ductility compared to the as-printed sample. This strength-ductility trade-off is related to changes in grain sizes with ultrafine grains enhancing strength and micron grains optimizing ductility, also the influence of the content of FCC/BCC phases and dislocation density. In particular, the sample heat-treated at 1000 °C for 1 hour and then water-cooled exhibited a better combination of strength and ductility, a yield strength of 790 MPa, and an elongation of 13%. This research offers innovative perspectives on crafting dual-phase HEA of Fe32Cr33Ni29Al3Ti3, allowing for tailorable microstructure and mechanical properties through a synergistic approach involving SLM and heat treatment.

Keywords

high-entropy alloy; selective laser melting; heat treatment; dual-phase; tailorable microstructure; mechanical property

Subject

Chemistry and Materials Science, Metals, Alloys and Metallurgy

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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