View in EDS

Microstructure and hardness of laser-clad FeCoCrNi/TiC medium-entropy alloy composite coating on austenitic stainless steel.

Saved in:

Bibliographic Details
Title:	Microstructure and hardness of laser-clad FeCoCrNi/TiC medium-entropy alloy composite coating on austenitic stainless steel.
Authors:	Dong, Haiyu¹ (AUTHOR), Chai, Linjiang¹ (AUTHOR) chailinjiang@cqut.edu.cn, Gong, Xingyu¹ (AUTHOR), Liu, Yuanzhuo¹ (AUTHOR), Liu, Hongliang¹ (AUTHOR), Zhao, Xiaotong¹ (AUTHOR), Zhang, Haoyu¹ (AUTHOR), Jiang, Luyao¹ (AUTHOR), Guo, Fei¹ (AUTHOR)
Source:	Journal of Alloys & Compounds. Dec2025, Vol. 1047, pN.PAG-N.PAG. 1p.
Subjects:	Microstructure, Hardness, Titanium carbide, Metallic composites, Austenitic stainless steel, Alloys, Dislocations in crystals, Laser deposition
Abstract:	Defect-free FeCoCrNi and FeCoCrNi/TiC medium-entropy alloy-based coatings were effectively applied to the austenitic stainless steel surface using laser cladding. Both coatings are found to be primarily composed of a single face-centered cubic phase (columnar or blocky grain structures), with average grain sizes of 16.3 ± 15.3 μm and 14.4 ± 16.0 μm, respectively. Additionally, both coatings contain numerous fine cellular or columnar subgrains, with Cr and Mn segregation at the subgrain boundaries. The TiC particles added to the preplaced powders decompose into free Ti and C atoms during the laser processing. Subsequently, C tend to combine with Cr and Ti at the subgrain boundaries to form Cr 23 C 6 and TiC precipitates, which are surrounded by a large number of dislocation tangles that can effectively hinder dislocation movement during deformation. Hardness test results indicate that the average hardnesses of the FeCoCrNi and FeCoCrNi/TiC coatings are 230.4 ± 6.8 HV and 275.4 ± 14.2 HV, respectively, which represent increases of ∼8 % and ∼29 % compared to the substrate (213.0 ± 6.8 HV). An analysis of the microstructural features indicates that more effective solid-solution, second-phase and dislocation strengthening are the primary factors contributing to the higher hardness of the FeCoCrNi/TiC composite coating. • Defect-free FeCoCrNi and FeCoCrNi/TiC MEA coatings were prepared on austenitic stainless steel using laser cladding. • Both coatings consist of irregular-shaped grains with numerous subgrains and element segregation at subgrain boundaries. • FeCoCrNi coating has dispersed Mn 2 O 3 phases, while FeCoCrNi/TiC coating contain many Cr 23 C 6 and TiC phases. • Higher hardness of FeCoCrNi/TiC coating results from joint solid-solution, second-phase, and dislocation strengthening. [ABSTRACT FROM AUTHOR]
	Copyright of Journal of Alloys & Compounds is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database:	Engineering Source

Description
Abstract:	Defect-free FeCoCrNi and FeCoCrNi/TiC medium-entropy alloy-based coatings were effectively applied to the austenitic stainless steel surface using laser cladding. Both coatings are found to be primarily composed of a single face-centered cubic phase (columnar or blocky grain structures), with average grain sizes of 16.3 ± 15.3 μm and 14.4 ± 16.0 μm, respectively. Additionally, both coatings contain numerous fine cellular or columnar subgrains, with Cr and Mn segregation at the subgrain boundaries. The TiC particles added to the preplaced powders decompose into free Ti and C atoms during the laser processing. Subsequently, C tend to combine with Cr and Ti at the subgrain boundaries to form Cr 23 C 6 and TiC precipitates, which are surrounded by a large number of dislocation tangles that can effectively hinder dislocation movement during deformation. Hardness test results indicate that the average hardnesses of the FeCoCrNi and FeCoCrNi/TiC coatings are 230.4 ± 6.8 HV and 275.4 ± 14.2 HV, respectively, which represent increases of ∼8 % and ∼29 % compared to the substrate (213.0 ± 6.8 HV). An analysis of the microstructural features indicates that more effective solid-solution, second-phase and dislocation strengthening are the primary factors contributing to the higher hardness of the FeCoCrNi/TiC composite coating. • Defect-free FeCoCrNi and FeCoCrNi/TiC MEA coatings were prepared on austenitic stainless steel using laser cladding. • Both coatings consist of irregular-shaped grains with numerous subgrains and element segregation at subgrain boundaries. • FeCoCrNi coating has dispersed Mn 2 O 3 phases, while FeCoCrNi/TiC coating contain many Cr 23 C 6 and TiC phases. • Higher hardness of FeCoCrNi/TiC coating results from joint solid-solution, second-phase, and dislocation strengthening. [ABSTRACT FROM AUTHOR]
ISSN:	09258388
DOI:	10.1016/j.jallcom.2025.184952