Journal
MATERIALS LETTERS
Volume 259, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2019.126769
Keywords
High-speed laser cladding; Ultrasonic surface mechanical rolling treatment; High-entropy alloy coating; Corrosion; Microstructure
Funding
- National Natural Science Foundation of China [51305292]
- Shanxi Scholarship Council of China [2014-024]
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The FeCoNiCrMn high-entropy alloy (HEA) coatings were prepared by high-speed laser cladding (HSLC) technology, and the surface was subjected to ultrasonic surface mechanical rolling treatment (SMRT). After SMRT, the surface of the coatings show a gradient structure. The coatings consist of planar crystal, columnar dendrites and equiaxed crystals from inside to outside. Corrosion behavior in a 3.5% NaCl solution indicates that SMRTed coatings exhibit higher corrosion resistance than the coatings without SMRT. Anti-corrosion mechanism was discussed based on grain refinement, grain boundary wetting phase transitions and compressive residual stress. (C) 2019 Elsevier B.V. All rights reserved.
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