Research on the Temperature Dependence of Deformation and Residual Stress via Image Relative Method

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

The study titled “Research on the temperature dependence of deformation and residual stress via image relative method” is an experimental study in which the residual stresses and temperature dependent deformation behavior of 304 stainless steel bars with different thicknesses of Al₂O₃ coating are investigated by “image relative method”. No obvious errors or omissions were found throughout the text that would compromise the integrity of the text. However, the work will be better presented if some minor stylistic adjustments are made below.

-It contains some errors in terms of English grammar. The grammatical errors need to be reviewed and corrected.

-The “image relative method” is not detailed enough; it would be more descriptive for the study if its methodological accuracy, calibration, error limits or measurement precision were given.

-The presence of residual stress was demonstrated, but its effect on the mechanical strength of the specimens was not analyzed. For this reason, a hardness test is recommended.

- Finally, the test procedure could be supported by a flowchart to clarify the procedures performed.

Comments for author File: Comments.docx

Comments on the Quality of English Language

There are errors in the English language that need to be corrected. Please correct them.

Author Response

Comments 1: It contains some errors in terms of English grammar. The grammatical errors need to be reviewed and corrected.

Response 1: Thank you for pointing this out. We have carefully checked the manuscript and revised it to the best of our ability.

Comments 2: The “image relative method” is not detailed enough; it would be more descriptive for the study if its methodological accuracy, calibration, error limits or measurement precision were given.

Response 2: Thank you for your suggestion. And a more detail description was provided in the manuscript on lines 47-52.

Comments 3: The presence of residual stress was demonstrated, but its effect on the mechanical strength of the specimens was not analyzed. For this reason, a hardness test is recommended.

Response 3: We agree with this opinion. The Vickers hardness of three specimens prepared in this work was 1144 MPa (S1), 1220 MPa (S2), 986 MPa (S3), respectively. In this work, we focused on the temperature dependence of deformation and residual stress in the specimens with different thickness of coating. The effect of residual stress on the mechanical strength of the specimens was analyzed in our previous work, such as: references 6, 17, 19 listed in this manuscript.

Comments 4: The test procedure could be supported by a flowchart to clarify the procedures performed.

Response 4: Thank you for your suggestion. The flowchart of test procedure was added in the revised manuscripts.

Reviewer 2 Report

Comments and Suggestions for Authors

The authors have studied the behavior of a thin prismatic straight beam (AISI 304 steel), coated on one side with Al2O3, depending on the thickness of the coating and two-way variation with temperature (heating and cooling) using a combined (theoretical-experimental) approach: the image relative method and Stoney’s formula. The object is the residual macro-stresses that are characteristic of such two-layer structures. In my opinion, the problem is defined precisely, and the solution to this problem is described in a sufficiently understandable way. The manuscript is structured well and is written in an understandable manner. Therefore, I recommend acceptance after minimal and minor adjustments.

1. Please edit the text on lines 63-65: „... width. And …”.
2. In my opinion, it is better for the reader if more information about formula (1) is given in the text, instead of making a reference to Ref 20.
3. I think this problem is suitable for finite element simulation. Such exist for two-layer structures, but an FE model can always be improved. Please take this as a recommendation for future research.

Author Response

Comments 1: Please edit the text on lines 63-65: „... width. And …”.

Response 1: Thank you for your suggestion. We have edited the text again.

Comments 2: In my opinion, it is better for the reader if more information about formula (1) is given in the text, instead of making a reference to Ref 20.

Response 2: Thank you for your suggestion. We have revised it in the manuscripts.

Comments 3: I think this problem is suitable for finite element simulation. Such exist for two-layer structures, but an FE model can always be improved. Please take this as a recommendation for future research.

Response 3: Thank you for your suggestion. We will improve our future research by using finite element simulation.