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Reviewer #1: This paper assess the early growth of fatigue cracks in stainless steel (SS) 304 using the time-demanding and detailed replica technique; I also find quite adequate the objective and path proposed that do not assume LEFM assumptions. The methodology and the experimental results seem reasonable, but the conclusions are highly limited and arguable. Therefore, this paper cannot be published until the following comments are fully addressed, a major review of the data is done, and further analysis is performed.

The main concern of this reviewer is the originality of this paper. The techniques, the material and the loading conditions are not innovative, so the main value of the paper lies on the observations and their analysis, which are arguable. To be more specific, the conclusion section has three items: The first and third points are not innovative and similar results have been reported in the literature. The second point proposes that the stress level does not affect the crack growth, which is surprising and not well supported (see my arguments later). Therefore, the conclusions do not provide a major innovative contribution to the literature, and this must be improved before this paper can be published.

To my understanding, it is not possible to conclude unequivocally from the data presented that the stress does not affect the crack growth behavior since there is no enough data. Indeed, the paper proposes only a range from 330 to 370 MPa, which is very limited, and either two or three realizations, which seems to be not enough for the wide variability of the regime studied. Furthermore, the data for 370MPa in figure 5 starts at 200 microns and seem systematically above the rest. If the authors want to support their conclusion, they should compare the fittings for each stress level and different crack lengths. Moreover, the assessment of the stress should extended to other stress ranges for the same crack range.
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Reviewer #3: This paper presents some very nice experimental results on small crack growth and coalescence of cracks in 304 austenitic steel.   The small crack experiments were performed on a single edge notch tensile coupons using an interruption/ replication method. The replicas were made using relatively new method and very good results were achieved.   In addition, the experimental plan appears well thought-out and very nice fatigue data was generated.  The results of the study show an interesting effect where the crack rate appears to be insensitive to the stress range employed in this study.  Furthermore, experimental results show that small fatigue cracks likely initiate from grain boundaries instead of other types of inclusions (i.e., particles).  Overall, the paper is well written and this reviewer enjoyed reading it.  It is suggested that this paper be excepted for publication.

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