Investigation of the Microstructure and Properties of CoCrFeNiMo High-Entropy Alloy Coating Prepared through High-Speed Laser Cladding
Round 1
Reviewer 1 Report
The manuscript report on the microstructure, chemical composition, mechanical properties and the corrosion resistance of CoCrFeNiMo high entropy alloy. The material is prepared by high-speed laser cladding (HLC). The manuscript can be improved before publication.
It is well writing and reports interesting results about CoCrFeNiMo by HLC technique. However, the novelty is so poor and should be highlighted to provide relevant points.
The work, first, should be compared to some similar studies like for example (https://doi.org/10.1007/s11771-022-5162-y) and provide the relevant points. A comparison of the same material deposited by the conventional technique should also be discussed.
The corrosion measurements need also to be discussed more. Mo element leads to the formation of a passivated top layer protecting the material but at what level? How is this resistance compared to the standard materials?
Author Response
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Author Response.pdf
Reviewer 2 Report
The manuscript reported CoCrFeNiMo high-entropy coating prepared by high-speed laser cladding from multiple points of view. The proposed sample was well-researched and the results were well-discussed, but technical improvements were not discussed in depth. As mentioned in the introduction section, laser cladding technology has been developed for CoCrFeNiMo high-entropy alloy. The authors should discuss how the results change by using normal and high-speed laser cladding. In addition, on Page 8, lines 235-239, the authors insisted the distribution of micromechanical properties of high-speed laser cladding CoCrFeNiMo high-entropy alloy has been known in general. It is totally opposite from what was said in the introduction: "As of now, there is still no research conducted on the high-speed laser cladding of the CoCrFeNiMo high entropy ally". If the surface properties of high-speed laser cladding CoCrFeNiMo high-entropy alloy have been known widely, the manuscript will lose most part of the originality and so it should not be published. This point should be clarified.
Author Response
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Reviewer 3 Report
1) The objective and novelty of the work are to be mentioned at the end of Introduction section.
2) It is mentioned in the page 4 as “CoCrFeNiMo atomized powder directly purchased from the manufacturer was selected as the cladding powder with the particle size of 15~53 μm. The powder was obtained by melting the five kinds of elemental powders under vacuum and high temperature, and then breaking and solidifying them into spherical particles in an argon atmosphere, which fully meets the technical requirements of high-speed laser cladding and coaxial powder feeding”. Is it purchased from the manufacturer and later subjected to the condition to fulfill the requirements or the conditioning was done while purchasing from the manufacture. If the later part is correct then second sentence of the above statement is not required. Please clarify and modify the manuscript.
3) How the process parameters of high-speed laser cladding mentioned in the Table 1 is arrived? Is it depend upon experience or availability or based upon literature review. Please clarify and give literature support if selection is based upon literature review.
4) Under section 2.2, it is written as “The surface of the cladding layer to be observed shall be polished with 600# ~ 2000 # abrasive paper, and then polished with diamond abrasive paste. The polished samples were used for the characterization and analysis of XRD, mechanical properties and corrosion resistance. When observed the microstructure of the coating, it was necessary to use aqua regia (HNO3: HCl=1:3) to corrode the polished surface”. Please give literature support for the surface finish requirement and preferential chemical attack.
5) In subheading “3. results and discussion”, please change as “3. Results and discussion”.
6) In Figure1 containing 6 spots, first spot is not defined. Also, what those figures explains is also not clear. Is it corroded surface or processed surface. Please clarify.
Revision is required
Author Response
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Author Response File: Author Response.pdf
Reviewer 4 Report
The manuscript presents research on the microstructure, phase composition, micromechanical properties, and electrochemical corrosion properties of CoCrFeNiMo high-entropy alloy coating, which was prepared by high-speed laser cladding. The authors study the correlation between the microstructure and properties of high-speed laser cladding CoCrFeNiMo coating. The topic is interesting due to it has great interest in areas of research involving the theoretical basis for the formation of high entropy alloy coating and due to that they can be considered as candidate materials for corrosive thermal environments.
The results presented are consistent.
The paper could be published. However, there are a few points that should be attended,
- Page 3, line 98. Please specify the manufacturer.
- Page 3, line 100. Please specify vacuum and high temperature values.
- Page 3, lines 101-102. Please state argon atmosphere.
- Page3, line 104. Please specify Q235 surface.
- Page 3, table 2 and line 143. ¿ is not there some impurity?
- Page 4, line 157-158. The crystal size and crystal arms values are not clear to me from the picture that the authors mention in the text. It is not possible that the authors do a statistical analysis or indicate clearly ¿how did they come to that conclusion?.
- Page 7, Figures 5.a and 5.b. Units need to be placed on the x and y axes. Also, H and Er need units.
none
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The manuscript can be accepted for publication in Coatings journal.
Reviewer 2 Report
Manuscript has been revised based on the reviewers' comments. I only have a comment. Ref26 appears on line 85, but ref25 on line 198.
