Direct laser deposition cladding of AlxCoCrFeNi high entropy alloys on a high-temperature stainless steel

Qi Chao, Tingting Guo, Tom Jarvis, Xinhua Wu, Peter Hodgson, Daniel Fabijanic

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

55 Citations (Scopus)

Abstract

Al x CoCrFeNi (x =0.3, 0.6 and 0.85) high entropy alloy (HEA) claddings were produced by coaxial direct laser deposition (DLD) on a 253MA austenitic steel substrate using a mixture of blended elemental powders. The effect of key processing variables on the formation of HEA claddings and the compositional mixing between the deposited layer and the substrate was investigated through a three-level parametric study on laser power, laser scanning speed, laser beam size, powder feeding rate and hatch distance. Using selected parameters, HEA claddings mostly free of defects were successfully manufactured with very minimal dilution. With an increase in the Al mole fraction from 0.3 to 0.6 and 0.85, the HEA claddings displayed an evolution of crystal structure from FCC, to FCC+BCC and BCC, accompanied by an increase in microhardness. The increased Al content also resulted in reduced microstructural stability of the coatings and hence higher level of thermal softening upon isothermal treatment at 1000°C.

Original languageEnglish
Title of host publicationSurface and Coatings Technology
Subtitle of host publicationThe 44th International Conference on Metallurgical Coatings and Thin Films (ICMCTF)
EditorsSamir Aouadi, Esteban Broitman, Carlos A. Figueroa, Grzegorz Greczynski, Christopher Muratore, Michael Stüber
Place of PublicationLausanne Switzerland
PublisherElsevier
Pages440-451
Number of pages12
Volume332
DOIs
Publication statusPublished - 25 Dec 2017
EventInternational Conference on Metallurgical Coatings and Thin Films 2017 - Town and Country Resort Hotel and Convention Center, San Diego, United States of America
Duration: 24 Apr 201728 Apr 2017
Conference number: 44th
http://www2.avs.org/conferences/ICMCTF/2017/index.htm

Publication series

NameSurface and Coatings Technology
PublisherElsevier
Volume332
ISSN (Print)0257-8972
ISSN (Electronic)1879-3347

Conference

ConferenceInternational Conference on Metallurgical Coatings and Thin Films 2017
Abbreviated titleICMCTF 2017
CountryUnited States of America
CitySan Diego
Period24/04/1728/04/17
Internet address

Keywords

  • Coating
  • Dilution
  • Direct laser deposition
  • High entropy alloy
  • Laser cladding
  • Thermal stability

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