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

Wu, Z.; David, S. A.; Leonard, D. N.; Feng, Z.; Bei, H.

doi:10.1080/13621718.2018.1430114

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

Journal Article · Mon Oct 01 00:00:00 EDT 2018 · Science and Technology of Welding and Joining

DOI:https://doi.org/10.1080/13621718.2018.1430114· OSTI ID:2281429

Wu, Z. ^[1]; David, S. A. ^[1]; Leonard, D. N. ^[1]; Feng, Z. ^[1]; ^[1]

Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2281429

Alternate ID(s):: OSTI ID: 1459315

Journal Information:: Science and Technology of Welding and Joining, Journal Name: Science and Technology of Welding and Joining Journal Issue: 7 Vol. 23; ISSN 1362-1718

Publisher:: SAGE PublicationsCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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