Publication detail

Influence of heat treatment on the microstructural evolution of CoCrFeNi high-entropy alloy prepared by Selective Laser Melting

ZHANG, H. ZHENG, Y. YANG, C. HUANG, B. LI, J. DING, Y. LIANG, L. QIU, Z. WANG, H. YANG, Y. TIAN, M. HUANG, Q. WU, Z. BOHÁČEK, J.

English title

Influence of heat treatment on the microstructural evolution of CoCrFeNi high-entropy alloy prepared by Selective Laser Melting

Type

journal article in Web of Science

Language

en

Original abstract

The CoCrFeNi high entropy alloy (HEA) is widely used in aerospace and nuclear industries due to its excellent performance. However, traditional manufacturing methods make manufacturing parts with complex structures difficult. In this study, CoCrFeNi high-entropy alloys were prepared by the Selective Laser Melting (SLM) method, and their microstructures and mechanical properties with different annealing heat treatments lasting from 3 min to similar to 1440 min were investigated. The surface of the constructed CoCrFeNi HEA alloys displayed typical SLM microstructures and morphologies. With increasing the heat treatment time, the melt pool boundary gradually disappeared within 10 min. The microstructure quickly changed from the original fine columnar crystals to long ellipsoidal grains, and the grain boundaries became more susceptible to etching after heat treatment. The crystals developed slowly in the next 20 h. According to the EBSD results, the un-heat-treated SLM HEA samples exhibit <101> texture along the build direction, the grains grow significantly after heat treatment, and the texture changes in the build direction. The microhardness values of the CoCrFeNi high-entropy alloys decrease with the increase in heat treatment time.

English abstract

The CoCrFeNi high entropy alloy (HEA) is widely used in aerospace and nuclear industries due to its excellent performance. However, traditional manufacturing methods make manufacturing parts with complex structures difficult. In this study, CoCrFeNi high-entropy alloys were prepared by the Selective Laser Melting (SLM) method, and their microstructures and mechanical properties with different annealing heat treatments lasting from 3 min to similar to 1440 min were investigated. The surface of the constructed CoCrFeNi HEA alloys displayed typical SLM microstructures and morphologies. With increasing the heat treatment time, the melt pool boundary gradually disappeared within 10 min. The microstructure quickly changed from the original fine columnar crystals to long ellipsoidal grains, and the grain boundaries became more susceptible to etching after heat treatment. The crystals developed slowly in the next 20 h. According to the EBSD results, the un-heat-treated SLM HEA samples exhibit <101> texture along the build direction, the grains grow significantly after heat treatment, and the texture changes in the build direction. The microhardness values of the CoCrFeNi high-entropy alloys decrease with the increase in heat treatment time.

Keywords in English

SLM; CoCrFeNi high-entropy alloy; Heat treatment; Microstructure; Mechanical properties

Released

12.02.2025

Publisher

ELSEVIER

Location

AMSTERDAM

ISSN

2238-7854

Volume

35

Number

February

Pages from–to

4920–4928

Pages count

9

BIBTEX


@article{BUT197266,
  author="Hao {Zhang} and Yongjian {Zheng} and Chengshuyu {Yang} and Bo {Huang} and Jiehua {Li} and Yaoyao {Ding} and Liwen {Liang} and Zixiang {Qiu} and Haixuan {Wang} and Yang {Yang} and Miaocheng {Tian} and Qizhong {Huang} and Zhining {Wu} and Jan {Boháček},
  title="Influence of heat treatment on the microstructural evolution of CoCrFeNi high-entropy alloy prepared by Selective Laser Melting",
  year="2025",
  volume="35",
  number="February",
  month="February",
  pages="4920--4928",
  publisher="ELSEVIER",
  address="AMSTERDAM",
  issn="2238-7854"
}