Development of Laser Cavitation Peening Using a Normal-Oscillation Nd:YAG Laser

Round 1

Reviewer 1 Report

Report on MS

The MS discussed cavitation bubble collapse can be utilized for mechanical surface 7 treatment to improve fatigue properties of metals including additive manufactured metallic mate-8 rials. A peening method using cavitation impact induced by a pulsed laser is called “laser cavitation 9 peening (LCP)”. Normally, a Q-switched Nd:YAG laser, whose pulse width is a few nanoseconds, 10 is used for LCP, which improves the fatigue strength.

Generally, the idea is good and introduces some new results, but needs some modifications before considering for publication as follows:

-The Refs. in introduction must but in the journal format for example Wagner [1] and so on.

-Eqs. (3)-(5) must cited.

-Figures (3-9) if possible made a comparison with the previous results obtained.

-Figure 3 needs more discussion, especially the comparison between LA case and LC case.

-Table 1 must be cited.

-More discussion needs to show the new results obtained and compare it with the previous results obtained.

-All symbols considered must be added in nomenclature.

Sincerely Yours

English language must be revised.

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

This manuscript presents the feasibility of improving the processing efficiency of laser cavitation peening by using longer laser pulse width. Overall, this manuscript is well-written without showing critical flaws. Besides, the objectives and significance of the study are clearly stated. The only critical issue in this manuscript is that the novelty/innovative aspects are vague, and thus, they should be emphasized in the last paragraph of the introduction. I recommend the acceptance of the manuscript after minor revision.

1.       The abstract needs to be revised. Major findings obtained from the investigation should be added to the abstract. Besides, please add also some quantitative results in the abstract.

2.       The novelty/innovative aspects of this work are vague. The introduction should give a better picture of what is lacking in the literature studies and the novelty of this work. However, these two critical aspects have been left out of the introduction. Please add statements emphasizing the novelty of this work in the last paragraph of the introduction.

3.       11 out of 39 references are self-citation. Self-citation should be limited to around 20 %.

Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report

In this paper the possibility of using a relatively longer laser pulse width was demonstrated, so as to increase the repetition frequency. The LCP process using a normal-oscillation Nd:YAG laser, with a pulsed energy of ~42 mJ/pulse, was optimized by observing the laser ablation (LA) and laser cavitation (LC). The topic is interesting for the readers from scientific point of view. Minor changes and additions are needed..

Keywords

- The Author should consider adding the keyword 'hardness'.

Introduction

- The state of the art has been properly prepared. The main question is - "Are 9 articles by the Author needed?". Please clarify.

Materials and Methods

- How many repetitions were performed?

Results

- On the Fig. 10 the effect of laser cavitation peening on hardness is given. Information on the number of measurements and basic statistical estimates is missing.

Conclusions

- The conclusions fully correspond to the obtained results.

References

- Author cited 39 papers (of which 11 are by the Author - 28%). Is it necessary to cite so many works by the Author?

Author Response

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Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

I recommended it for publication in the current form.