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Article
Peer-Review Record

Consideration of Magnetic Measurements for Characterisation of Ferrite–Martensite Commercial Dual-Phase (DP) Steel and Basis for Optimisation of the Operating Magnetic Field for Open Loop Deployable Sensors

Metals 2021, 11(3), 490; https://doi.org/10.3390/met11030490
by Mohsen Aghadavoudi Jolfaei *, Lei Zhou and Claire Davis
Reviewer 1: Anonymous
Reviewer 2: Anonymous
Reviewer 3: Anonymous
Reviewer 4:
Metals 2021, 11(3), 490; https://doi.org/10.3390/met11030490
Submission received: 16 February 2021 / Revised: 8 March 2021 / Accepted: 9 March 2021 / Published: 16 March 2021
(This article belongs to the Special Issue FaSTeP: Faultless Steel Production and Manufacturing)

Round 1

Reviewer 1 Report

The paper represents significant contribution to the field of research, is very well written and is easy to read and to understand. The authors clearly show that the detailed study of metallurgy and characteristic magnetic properties of commercial DP600, DP800 and DP1000 steel samples reveal that initial permeability and coercivity can both be used as a reliable non-destructive measurement to characterize effect of microstructure on properties of  DP steels.

Author Response

Thank you for your comments

Reviewer 2 Report

Usefulness of paper materials

 

  1. The dual-phase steels is important component of the automotive industry for this reason the topic of the paper, which is intended for the analysis how the correlation between coercivity and initial permeability could be used for the prediction of the steels strength is interesting and important from both scientific and application areas.

 

Drawbacks of materials presentation

 

  1. It would be more comfortable for readers to get more detail information about BH loop measurement system (lab-based closed magnetic circuit), developed at the University of Manchester in the present paper.
  2. According to equation (2) the initial permeability can be obtained when ΔH approaches to zero. It has to be shown how this criteria is realized during processing the experimental data. In other words, how small ΔH value is used for initial permeability calculation?
  3. In Figure 6A it would be good to show the values of magnetic field amplitudes corresponding different series of minor loops.

 

  1. The initial permeability is a direct function of ferrite fraction (see figure 8), meanwhile the tensile strength non-linearly depends on initial permeability (figure 9). It would be good explain how tensile strength depends on ferrite fraction content and what model gives equation which was used for experimental data fitting procedure in figure 9.

 

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 3 Report

Review for metals-1080820

Consideration of Magnetic Measurements for Characterisation of Ferrite–Martensite Commercial DP Steel and Basis for Optimisation of the Operating Magnetic Field for Open Loop Deployable Sensors

The authors address an interesting research topic for the journal Metals. It is a well-organized paper but some recommendations should be considered for its publication:

Comments and Suggestions for Authors

  1. As Figure 3 is not clear, it should include some explanatory text, e.g. if the curves are grouped by the type of DP steel.
  2. Figures 2, 4, 5, and 9 include the value of the correlation coefficient, but should also include the fitting equation.
  3. Table 1. Sample ID nomenclature should be clarified in the main text, explaining that X mm indicates the thickness.
  4. Please justify the reason for choosing different thicknesses to different types of DP steels, e.g. since DP600CR 1mm and DP1000CR 1mm, why is DP800CR0.95mm and not DP800CR1mm used in the article?
  5. Some units are written in italics (lines 100, 101, 114, etc.) and some are not (lines 109, 110, 117, etc.). Please unify the criteria.
  6. Figure 5 is fitted with a straight line but, if the literature data are removed, the fit could be exponential or polynomial. Thus, the authors' results are different from previous research papers. Please could you expand several sentences in the manuscript to discuss this fact?
  7. Figure 6: It is necessary to clarify in the figure caption what is represented in Figure 6a, b, etc.
  8. For the sake of clarity, order the figure caption (sample ID) in the same order of curves, e.g. the top one in the figure caption should be DP600HR4mm and the bottom one should be DP1000CR1mm.
  9. Please remove the double blank spaces in the manuscript, e.g. lines 86, 321, 333, 336, etc.
  10. By joining the fitting equations in figures 5 and 6, a mathematical equation relating the initial permeability to the coercivity can be obtained. The authors should include this idea to complete the discussion in the manuscript
  11. Conclusion section. Authors include the correlation coefficient -which is not relevant-, but do not include the fitting equation, which is the relevant aspect.
  12. Conclusion section: The last paragraph is not clear. Authors indicate the “fit equation”…”for the coercivity and the initial permeability”… This is not well expressed, since these fitting curves are coercivity vs tensile strength and initial permeability vs tensile strength. Please, clarify this sentence.
  13. Please, revise the format of the references according to the MDPI guidelines
  14. Although the number and the selection of references are adequate, it would advisable to include more papers from the journals of MDPI editorial (Metals, Applied Sciences, Materials, etc.) related to the topic of the manuscript.

 

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 4 Report

    The authors studied the magnetic properties of commercial DP steels (DP600, DP800 and DP1000 grades) were evaluated using initial permeability, incremental permeability and coercivity and correlated with the key micro-structural differences between the grades. They found that the initial permeability is a slightly more sensitive magnetic parameter compared to the coercivity for discriminating/assessing the mechanical properties of DP steels. It is very interesting to have analyzed magnetism properties in dynamic properties such as tensile strength.

 1.    Explain how the error of each data of each figures 2, 4, 5, 8, and 9, were obtained. In addition, please show how to obtained the value of R2.

2. In Figure 9, the fitting line was explained by the exponential function. Please explain the physical origin of this function.

Author Response

Please see the attachment. 

Author Response File: Author Response.pdf

Round 2

Reviewer 3 Report

Review for metals-1080820

Consideration of Magnetic Measurements for Characterisation of Ferrite–Martensite Commercial DP Steel and Basis for Optimisation of the Operating Magnetic Field for Open Loop Deployable Sensors

Some recommendations were not taken into account:

  1. Please, revise the format of the references according to the MDPI guidelines.
  2. Conclusion section: For the sake of clarity, the last paragraph should be modified in the manuscript.

Author Response

 

Response to Reviewer 3 comments

1-Please, revise the format of the references according to the MDPI guidelines.

Response1

MDPI's style has been used (References section, line 380-454)

 

2-Conclusion section: For the sake of clarity, the last paragraph should be modified in the manuscript.

Response2

It has been specified that the best fit equation is for tensile strength ( line 373).

Author Response File: Author Response.pdf

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