Enhancement of Spreadability in Haynes 230 Powder via In Situ Micro-Oxidation Gas Atomization for Additive Manufacturing Process

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

This research focuses on the enhancement of spreadability in Haynes 230 Powder via in situ micro-oxidation gas atomization. 

 

The novelty is evident throughout the manuscript.

The use of language is excellent and

The overall manuscript presentation is very good.

 

Authors should consider the following minor revisions prior publishing this work;

1.      Title needs to be more specific. The word “Additive Manufacturing” should be added as the application is tied to additive manufacturing.

2.      In introduction line 62, regarding the “low-cost” statement, authors should consider adding a few lines regarding the cost analysis of the method as it contributes to modern industry needs and novelty.

3.      Regarding the mechanical properties of the fabricated materials, authors need to initially add a paragraph in the experimental part explaining the tensile testing methodology, the standard used to perform it, the specimens’ type and specimens number and the apparatus used to perform the test. That information is missing from the manuscript and needs to be added.

4.      Moreover, why the authors chose to only perform tensile testing and not also bending test?

5.      Authors chose to investigate the mechanical properties, its needed to be done in a more complete manner. Authors should also add Tensile modulus of elasticity graph and explain the curves and the error margin of the two curves.

6.      Is there a true increase in tensile strength? What is the tensile strength in each case and what is the mod. Of elasticity in each curve? Authors should also include the error margins.

Author Response

Dear Reviewer:

Thank you very much for the reviewer’ comments and suggestions on our manuscript. Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

The article under review is of undoubted interest, since Haynes 230 composite alloy powders are of interest for various applications, The proposed method for improving the quality of powders is quite promising, and the authors have convincingly demonstrated its potential. The research was carried out at a fairly high level and the results are convincing.

There are some minor editorial notes.

1. Columns in table 5 should not be given with the same values. These values should be given as a note to the table

2. Fig. 7 is inexpressive and can be replaced by one sentence.

Author Response

Dear Reviewer:

Thank you very much for the reviewers’ comments and suggestions on our manuscript. Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 3 Report

Comments and Suggestions for Authors

I want to congratulate the authors for the revised manuscript titled as “Enhancement of Spreadability in Haynes 230 Powder via In-Situ Micro-Oxidation Gas Atomization for additive manufacturing process”. The revised article is interesting and deserves the attention of readers. However, there are several points in the article that require further explanation before final acceptance.

What is new being presented in this article? Put this information in the abstract.

At the end of Introduction section, it would be better to add the paper's organization in different sections.

The gap area in the research is not clear.

The XRD diffraction pattern of Fig.2b should be marked with a standard PDF card. Also, the referred PDF card No. in XRD results should be supplemented in the corresponding text of Fig. 2b.

It is necessary to give quantitative and qualitative indicators of the proposed method in conclusion. Conclusions should be written in more detail adding numeric data. Conclusions section is inadequate. In conclusion section, it is necessary to more clearly show the novelty of the article and the advantages of the proposed method. Please try to emphasize your novelty, put some quantifications, and comment on the limitations.

 

Language used in the manuscript is generally satisfying. However, writers should pay more attention of singular / plural nouns. Also, they should control the spell check/ punctuation of words and sentences. Please check all manuscript for language and misspellings. Also, please recheck upper and lower case letter. . In addition, spaces should be added between words and numbers. Please fix the typographical and eventual language problems in paper.

 

Author Response

Dear Reviewer:

Thank you very much for the reviewer’ comments and suggestions on our manuscript. Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 4 Report

Comments and Suggestions for Authors

This study demonstrates successful production of highly flowable and spreadable Haynes 230 powder for additive manufacturing using in-situ micro-oxidation gas atomization. The process reduces defects, enhances packing density, and shows promise for laser powder bed fusion processes. However, before further consideration of the manuscript, the authors must “fully” address the comments listed below:

 

1.      In what ways did the powder produced by in-situ micro-oxidation gas atomization differ from conventionally gas-atomized powder, especially in terms of flowability and spreadability?

 

2.      Can you elaborate on the reduction in the angle of repose by 25% and its correlation with the resulting powder bed packing density of 5.67 g/cm3, representing 63.7% of the theoretical density?

 

3.      How did the in-situ micro-oxidation process influence the oxygen content in the Haynes 230 powder, and how was this confirmed through XRD testing?

 

4.      Figure 3B shows the static angle of repose, which is highly valuable. Please also mention in your paper that these angles can be easily measured using very inexpensive goniometer setups by referencing these papers: paper 1: https://doi.org/10.1063/1.5022370, paper2: https://doi.org/10.1038/s41598-023-28763-1. 

 

5.      Can you elaborate on the role of high-pressure gas, particularly the use of high-purity argon, in breaking the molten metal into metal droplets during the gas atomization process?

 

6.      How did the flow ratio of oxygen to argon at 1500:1 contribute to the formation of a thin oxide layer on the surface of the powder particles during the atomization process?

Author Response

Dear Reviewer:

Thank you very much for the reviewers’ comments and suggestions on our manuscript. Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 4 Report

Comments and Suggestions for Authors

Comments are addressed. 

Author Response

Dear Reviewer:

Thank you very much for the reviewer’ comments .