Microstructure and Wear Resistance of Fe60 Laser Cladding Coating Assisted by Steady Magnetic Field–Mechanical Vibration Coupling Field

Round 1

Reviewer 1 Report

The authors presented an interesting work, but it requires numerous improvements to be of satisfactory quality.

General remarks

1. The world literature on the subject of laser surfacing combined with magnetic action and vibration should be analyzed and discussed in the Introduction

2. The novelty of the work in comparison with the state of the art or science should be indicated.

3. Please provide details of the equipment used in the work in the system (designation, company, city, country)

4. Give the conclusions in the form of points, where the insights from the work will be defined.

5. The discussion of the results should be improved, the current one is insufficient.

Detailed comments

Line 78 Provide equipment details (see general note 3)

Line 73 Enter steel grade 45 also in the form 1.XXXX

Table 1 Steel-45 is not the correct name for the steel grade. Should be improved. Provide in the text the method of determining the chemical composition given in table 1

Line 85 "magnetic field with an excitation current of 3.2 A"? - provide the appropriate unit for characterizing the magnetic field. The comment also applies to table 2.

Lines 94, 98, 100, 101, 104 - Provide equipment data in the layout (designation, company, city, country) (see general note 3)

Line 151 give the uncertainty of the hardness measurement Figure 4 no description of figures a) and b)

Line 156 - enter the value of the Ks parameter or the method of its determination

Formula 2 provide reference to the literature.

Explain why you gave it formulas 1 and 2 if you did not use them at work (no calculation results)? I recommend making calculations and providing them at work.

Figure 7 List the symbols used with their description below the figure,

Rows 187-203 The authors developed a model to explain the effects of vibration and the magnetic field on the distribution of grains, but Figures 3 and 4 show only a typical dendritic structure with a different arrangement. This does not correspond to the model in Fig. 7. Explain this point in the text. Also, explain if the different arrangement of the dendrites causes an anisotropy of properties?

Figure 8 is not very good quality, you need to improve it.

The surface analysis in Fig. 8 is insufficient to establish the effects of vibration and magnetic field. You should cross-section the coating and check for cracks or delamination. You also need to show surface profilograms before and after the test. Usually, the abrasion cross-section is also shown.

I have a question, do you think that 20 minutes of the test is sufficient to determine the tribological properties of a hard coating?

Line 232 "The minimum grain size" - you write about the size of the grain, but nowhere in your work did you give their size.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

In the paper "Microstructure and wear resistance of Fe60 laser cladding coating assisted by alternating magnetic field-mechanical vibration coupling field" Fe60 laser cladding coating was prepared on the surface of 45 steel with the assistance of alternating magnetic field-mechanical vibration coupling field. 
The main remark of the paper is the low level of discussion of the results and the relationship between the microstructure and the properties of the obtained coatings. According to XRD, the coating contains (Fe,Cr), (Fe,Ni), (Ni-Cr-Fe) phases. What are these phases? Space groups or structure type must be specified. From the description, the coating contains solid solutions based on bcc, but according to hardness measurements, the thickness of the coating is 1 mm. With such experimental parameters, the diffraction pattern should contain only reflections from the coating. Fe60 contains 4% carbon and 2% boron. Such a composition should lead to the formation of only carbide and boride phases. By itself the 2-14-1 phase, which is proposed to describe the spectrum (ICDD, PDF-2 01-089-7245) is a solid solution based on the fcc structure and cannot describe the composition of the coating, and the solid solution cannot give such an increase in hardness.
As for the use of a magnetic field, the explanation of its influence on the formation of the structure is doubtful, since for movement under the Lorentz force it is necessary that the grains have a charge. Also, the unit of magnetic field  is't Gauss, but in Oersteds or A/m. In connection with this, the paper requires deep processing for publication.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

Thank you for taking into account my comments and recommendations. I will recommend publishing the work.

Reviewer 2 Report

Сomments have been corrected and the article can be published.