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. 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:
-
[1]
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 2281429
- Alternate Identifier(s):
- OSTI ID: 1459315
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Published Article
- Journal Name:
- Science and Technology of Welding and Joining
- Additional Journal Information:
- Journal Name: Science and Technology of Welding and Joining Journal Volume: 23 Journal Issue: 7; Journal ID: ISSN 1362-1718
- Publisher:
- SAGE Publications
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; high-entropy alloy; welding; weldability; mechanical properties; microstructure
Citation Formats
Wu, Z., David, S. A., Leonard, D. N., Feng, Z., and Bei, H. Microstructures and mechanical properties of a welded CoCrFeMnNi high-entropy alloy. United Kingdom: N. p., 2018.
Web. doi:10.1080/13621718.2018.1430114.
Wu, Z., David, S. A., Leonard, D. N., Feng, Z., & Bei, H. Microstructures and mechanical properties of a welded CoCrFeMnNi high-entropy alloy. United Kingdom. https://doi.org/10.1080/13621718.2018.1430114
Wu, Z., David, S. A., Leonard, D. N., Feng, Z., and Bei, H. Mon .
"Microstructures and mechanical properties of a welded CoCrFeMnNi high-entropy alloy". United Kingdom. https://doi.org/10.1080/13621718.2018.1430114.
@article{osti_2281429,
title = {Microstructures and mechanical properties of a welded CoCrFeMnNi high-entropy alloy},
author = {Wu, Z. and David, S. A. and Leonard, D. N. and Feng, Z. and Bei, H.},
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. 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 = 7,
volume = 23,
place = {United Kingdom},
year = {Mon Oct 01 00:00:00 EDT 2018},
month = {Mon Oct 01 00:00:00 EDT 2018}
}
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