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Title: Microstructures and mechanical properties of a welded CoCrFeMnNi high-entropy alloy

Abstract

The response of the CoCrFeMnNi high-entropy alloy to weld thermal cycles was investigated to determine its applicability as an engineering structural material. Two processes were used: high-energy-density, low-heat-input electron beam (EB) welding and low-energy-density, high-heat-input gas tungsten arc (GTA) welding. Weldability was determined through comprehensive microstructural and mechanical property characterisation of the welds. The welds did not develop solidification cracking or heat-affected zone cracks. The microstructures in weld fusion zones are similar to that in the as-cast materials, consisting of large columnar grains with dendrite. The dendrite arm spacing and the extent of elemental segregation were less in the welds than in the cast ingot, and also were less pronounced in the EB weld than in the GTA weld. Compositional microsegregation between dendritic cores and interdendritic regions of the welds was insignificant. Both welds exhibited slightly higher yield strengths than the base metal. Here, the EB weld possessed comparable tensile strength and ductility to that of the base metal. In comparison, the GTA weld maintained ~80% of the base metal’s tensile strength and 50% of the ductility.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1459315
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Science and Technology of Welding and Joining
Additional Journal Information:
Journal Volume: 23; Journal ID: ISSN 1362-1718
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high-entropy alloy; welding; weldability; mechanical properties; microstructure

Citation Formats

Wu, Zhenggang, David, Stan A., Leonard, Donovan N., Feng, Zhili, and Bei, Hongbin. Microstructures and mechanical properties of a welded CoCrFeMnNi high-entropy alloy. United States: N. p., 2018. Web. doi:10.1080/13621718.2018.1430114.
Wu, Zhenggang, David, Stan A., Leonard, Donovan N., Feng, Zhili, & Bei, Hongbin. Microstructures and mechanical properties of a welded CoCrFeMnNi high-entropy alloy. United States. doi:10.1080/13621718.2018.1430114.
Wu, Zhenggang, David, Stan A., Leonard, Donovan N., Feng, Zhili, and Bei, Hongbin. Sun . "Microstructures and mechanical properties of a welded CoCrFeMnNi high-entropy alloy". United States. doi:10.1080/13621718.2018.1430114.
@article{osti_1459315,
title = {Microstructures and mechanical properties of a welded CoCrFeMnNi high-entropy alloy},
author = {Wu, Zhenggang and David, Stan A. and Leonard, Donovan N. and Feng, Zhili and Bei, Hongbin},
abstractNote = {The response of the CoCrFeMnNi high-entropy alloy to weld thermal cycles was investigated to determine its applicability as an engineering structural material. Two processes were used: high-energy-density, low-heat-input electron beam (EB) welding and low-energy-density, high-heat-input gas tungsten arc (GTA) welding. Weldability was determined through comprehensive microstructural and mechanical property characterisation of the welds. The welds did not develop solidification cracking or heat-affected zone cracks. The microstructures in weld fusion zones are similar to that in the as-cast materials, consisting of large columnar grains with dendrite. The dendrite arm spacing and the extent of elemental segregation were less in the welds than in the cast ingot, and also were less pronounced in the EB weld than in the GTA weld. Compositional microsegregation between dendritic cores and interdendritic regions of the welds was insignificant. Both welds exhibited slightly higher yield strengths than the base metal. Here, the EB weld possessed comparable tensile strength and ductility to that of the base metal. In comparison, the GTA weld maintained ~80% of the base metal’s tensile strength and 50% of the ductility.},
doi = {10.1080/13621718.2018.1430114},
journal = {Science and Technology of Welding and Joining},
number = ,
volume = 23,
place = {United States},
year = {Sun Feb 25 00:00:00 EST 2018},
month = {Sun Feb 25 00:00:00 EST 2018}
}

Journal Article:
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Works referenced in this record:

Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes
journal, May 2004

  • Yeh, J.-W.; Chen, S.-K.; Lin, S.-J.
  • Advanced Engineering Materials, Vol. 6, Issue 5, p. 299-303
  • DOI: 10.1002/adem.200300567