A Comparative Study of Machining Property in Inconel 718 Superalloy Grinding with Al2O3- and CBN/Fe-Based Spherical Magnetic Abrasives
Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsThis manuscript presents a comparative analysis of the magnetic abrasive finishing (MAF) performance of Inconel 718 superalloy with Al2O3 and CBN/Fe based spherical magnetic abrasive particles (MAPs). According to the authors, on Inconel 718 superalloy, CBN/Fe-based MAPs operate at a lower temperature than Al2O3/Fe-based MAPs generate less heat during machining of the superalloy and provide a smoother surface finish on the workpiece surface.
The manuscript is well designed regarding overall structure and content, providing a comparative study for alloys that are difficult to machine. The publication of the draft after some minor revisions, which I have listed below, will contribute to the work in the relevant field.
1. The "introduction" needs to be improved. Especially in the second paragraph, you could provide the reader with specific comparative examples from the literature. Also in the same paragraph, the authors should support with references why MAPs should be in spherical geometry.
2. In the "Experimental Materials" section, it is stated that spherical MAPs were prepared by the gas automation method, but no information is given about the method. The authors should add this information, including preparation parameters, and improve the section with references.
3. In the picture on the right in Figure 4, some of the captions on the picture are half-finished. In addition, what "magnetic" means in the same picture is unclear.
4. The labels of the axes in the graphs are written in a very small font, it would be better to enlarge them in terms of legibility. In addition, I think, in Figure 6, the profile curves data were used by directly copying the result without using a graphics processing program. It would be more appropriate in terms of appearance if you present these data by processing them in software as you did in the other figures.
5. In the Conclusion section, it will be useful for you to compare the data you have obtained with other studies in the literature to fully reveal the difference of your study from others.
Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsGeneral review: This author explains the finishing performance of spherical CBN/Fe-based magnetic abrasive particles (MAPs) and Al2O3/Fe-based magnetic abrasive particles (MAPs) prepared by gas atomization method in magnetic abrasive finishing (MAF) of Inconel 718 superalloy. In MAF, it was found that compared with Al2O3/Fe-based MAPs, CBN/Fe-based MAPs have a lower grinding temperature and generate less heat during the grinding of Inconel 718 superalloy. The grinding pressure generated on the workpiece is relatively stable (Al2O3/Fe-based MAPs have a larger fluctuation range of grinding pressure on the workpiece surface during the grinding process). The surface roughness of the workpiece changes from Ra 0.57 μm rapidly dropped to Ra 0.039 μm, and the material removal reaches 42 mg within 20 minutes. After finishing, the scratches on the surface of the workpiece basically disappear, the contour curve is relatively flat, and there is almost no adhesion on the surface of the workpiece. The mirror effect of the superalloy surface is good, and ultimately a better surface quality can be obtained. However, before it can be published, I have some questions about this article and some suggestions:
Minor revision:
1. I strongly recommend to drop the first paragraph in the Introduction section because Inconel 718 is a very common material and pretty much known in popular.
2. Could you add a specification table with regard to the mechanical properties between Al2O3 and CBN?
3. The experimental analyses and theoretical results of Inconel 718 in your paper are very similar to this technique used in this paper. Thus, you should read and cite this paper entitled, “Functionally graded structure of a nitride-strengthened Mg2Si-based hybrid composite.”
4. Could you more discuss the temperature aspect while milling any structure?
5. Some references, which are older than 2015, should be changed to more new ones.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
