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Peer-Review Record

Effects of Travel Speed on the Microstructure and Abrasion Resistance of Hardfacing Alloys Deposited with Composite Powder Particles and Solid Wire

Metals 2020, 10(6), 740; https://doi.org/10.3390/met10060740
Reviewer 1: Anonymous
Reviewer 2: Anonymous
Reviewer 3: Anonymous
Reviewer 4: Anonymous
Metals 2020, 10(6), 740; https://doi.org/10.3390/met10060740
Received: 25 April 2020 / Revised: 26 May 2020 / Accepted: 27 May 2020 / Published: 2 June 2020
(This article belongs to the Special Issue Hardfacing of Metals and Alloys)

Round 1

Reviewer 1 Report

The paper titled “Effects of travel speed on the microstructure and abrasion resistance of hardfacing alloys deposited with composite powder particles and solid wire” fits the scope of journal but is not well organized and written. In my opinion the paper can be accepted after minor revision.

In the following my comments:

In Table 2 the authors should report the speed of wire used for all travel speed analysed in their work.

In the text there are some typos e.g the authors should insert a blank between the number and unit of measure.

Moderate proof of English is due.

Author Response

The paper titled “Effects of travel speed on the microstructure and abrasion resistance of hardfacing alloys deposited with composite powder and soild wire” fit the scope of the journal but is not well organized and written. In my opinion, the paper can be accepted after minor revision.

Response to the Reviewer’s Comments on manuscript: Effects of travel speed on the microstructure and abrasion resistance of hardfacing alloys deposited with composite powder particles and solid wire

The authors are very thankful to the reviewers for their valuable suggestions and comments to improve the quality of our manuscript. The necessary modifications and corrections have carefully been made as per the reviewer’s suggestions and the revised parts havebeen highlighted in the red color text in the revised manuscript.

1.In Table 2, the authors should report the speed of wire used for all travel speed analyzed in their work.

Response:

Thanks for your kind suggestion. We have added the speed of wire ( wire feed rate) in Table 2.

Table 2. Welding parameters of hardfacing alloys

Parameters

Current(A)

Voltage(V)

Wire extension(mm)

Wire feed rate (mm/s)

 

410

27

30

45

2.In the text, there are some typos e.g the authors should insert a blank between the number and unit of measure.

Response:

We are very sorry for making the confusion. We have inserted a blank between the number and unit of measure.

3.Moderate proof of English is due.

Response:

Thanks for your kind suggestion. Here is the English proof of such sentence as “Composite powder particles (CPP) preset on base metals were fused with a solid wire to form a melt by the intense heat provided by the arc. X-ray diffractometer, scanning electron microscopy, and energy dispersive spectrometer were employed to investigate the effects of travel speed on the microstructure and abrasion resistance.”

 

Reviewer 2 Report

This article describes the study of the effects of travel speed on the microstructure and abrasion resistance of hardfacing alloys deposited with composite powder particles and solid wire. The paper has high quality and importance for science. By combining the experimental results and discussions, it was clearly described the reasons of obtained result. This paper is new, original and well organized. English language is good in the paper and all references are adequate. Also all parts of paper are important and conclusion is fine. I recommend this paper for publication, but with minor revision:

  1. You need to make the letters larger in Figures 1, 2, 3, 4, 5, 8, 9.
  2. What is the accuracy of determining the chemical composition in Table 5? It should be pointed out.

Author Response

The article describes the study of the effects of travel speed on the microstructure and abrasion resistance of hardfacing alloys deposited with composite powder particles and soild wire. The paper has high quality and importance for science. By combining the experimental results and discussions. It was clearly described the reasons of obtained result. This paper is new, original and well organized. English language is good in the paper and all references are adequate. Also all parts of paper are important and the conclusion is fine. I recommended this paper for publication, but with minor revision.

Response to the Reviewer’s Comments on manuscript: Effects of travel speed on the microstructure and abrasion resistance of hardfacing alloys deposited with composite powder particles and solid wire

The authors are very thankful to the reviewers for their valuable suggestions and comments to improve the quality of our manuscript. The necessary modifications and corrections have carefully been made as per the reviewer’s suggestions and the revised parts havebeen highlighted in the red color text in the revised manuscript.

1.You need to make the letters larger in Figures 1, 2, 3, 4, 5, 8, 9.

Response:

Thanks for your kind suggestion. We have enlarged the letters in Figures 1, 2, 3, 4, 5, 8, 9.

 

2.What is the accuracy of determining the chemical composition in Table 5? It should be pointed out.

Response:

We are very sorry for making the confusion. We have revised the accuracy of the chemical composition in Table 5. And the corresponding parts have been revised and highlighted in the red color in the manuscript.

 

Table 5. Micro-area chemical composition in high chromium hardfacing alloys (atom fraction, %)

Point

Atom fraction (%)

abs. error (%)

[1 sigma]

a1

a2

a3

a4

b1

b2

b3

C

32.93

34.12

33.68

17.13

13.29

40.69

17.82

19.71

Ti

--

1.19

--

--

--

--

--

0.17

V

3.70

2.25

3.59

3.30

0.42

4.02

0.68

0.92

Cr

33.48

21.06

29.83

31.33

6.46

21.96

7.70

0.22

Reviewer 3 Report

1)The text should be modifying, especially.  the conclusion part is no focus. 

2) Results and Discussion part,  less be discussion.  

Author Response

Response to the Reviewer’s Comments on manuscript: Effects of travel speed on the microstructure and abrasion resistance of hardfacing alloys deposited with composite powder particles and solid wire

The authors are very thankful to the reviewers for their valuable suggestions and comments to improve the quality of our manuscript. The necessary modifications and corrections have carefully been made as per the reviewer’s suggestions and the revised parts havebeen highlighted in the red color text in the revised manuscript.

1.The text should be modifying, especially, the conclusion part is no focus.

Response:

Thanks for making such confusion. We have rewritten the conclusion part. The corresponding parts have been revised and highlighted in the red color in the manuscript.

In this study, the composite powder particles preset on base metals were fused with a solid wire by the intense heat provided by the arc to form a melt. The X-ray diffractometer, scanning electron microscopy, and energy dispersive spectrometer were employed to investigate the effects of travel speed on the microstructure and abrasion resistance. It was found that the microstructure of the hardfacing alloys with composite powder particles or powder mixture consists of γ-Fe, M7C3, and (Ti,V)C. With an increase in the travel speed, the microstructure with composite powder particles changes from the hypoeutectic to the hypereutectic form, but the one with the powder mixture remains hypoeutectic throughout. For hardfacing alloys with composite powder particles, the increasing travel speed not only contributes to the reduction of dilution ratio of the base metals on these alloys but also deliberately improves the volume fraction of primary M7C3-type carbides, which is advantageous for the improvement of abrasive resistance. The corresponding study also indicated that the bonding function executed by the powder components led to a significant increase in the abrasion resistance and improved the utilization ratio of alloying elements. Further studies suggested the primary wear mechanisms of micro-cutting and micro-spalling.

2.Results and Discussion part, less be discussion.

Response:

Thanks for your kind suggestion. We have reduced the discussion section. 

Reviewer 4 Report

The authors conducted experimental investigations of hardfacing process using composite power particles and solid wire in terms of the processing speed. The topic is important. However, it is necessary to add information about the following questions.

  1. Please carefully rewrite the abstract. The abstract is not a minipaper. Please avoid including background information. Please start describing the results, which should be concisely summarized.
  2. Please be careful with the terminology. For example, hypoeutectic and hypereutectic.
  3. Before using the term, PM, please define it somewhere.
  4. Please add some references for the wear mechanisms you mentioned. Are they a new finding or important result that should be included in the abstract and conclusion?
  5. You said that the composite powder particles can be also used as the consumable of laser welding. However, I could not find any information that made you conclude like that.
  6. Careful proofreading by a native English speaker is recommended.

Author Response

The authors conducted experimental investigations of hardfacing process using composite powder particles and solid wire in terms of the processing speed. The topic is important. However, it is necessary to add information about the following questions.

1.Please carefully rewrite the abstract. The abstract is not a minipaper. Please avoid including background information. Please start describing the results, which should be concisely summarized.

Response:

We apologize for making the mistakes in the abstract. We have rewritten the abstract, and the corresponding abstract have been revised and highlighted in red color in the revised manuscript.

 

Revised abstract:

Composite powder particles (CPP) preset on base metals were fused with a solid wire to form a melt by the intense heat provided by the arc. X-ray diffractometer, scanning electron microscopy, and energy dispersive spectrometer were employed to investigate the effects of travel speed on the microstructure and abrasion resistance. It was found that the microstructure of hardfacing alloys with CPP consists of γ-Fe, M7C3, and (Ti,V)C. With an increase in the travel speed from 3.5 to 6 mm/s, the microstructure with CPP changed from hypoeutectic to hypereutectic structure. For hardfacing alloys with CPP, the increase in the travel speed not only contributed to the reduction of dilution ratio of base metals, but also deliberately increased the volume fraction of primary M7C3-type carbides, which indicated that the bonding function executed on powder components led to the significant improvement in abrasion resistance and increased the utilization ratio of alloying elements. The wear mechanism of hardfacing alloys included micro-cutting of abrasive particles and micro-spalling.

2.Please be careful with the terminology. For example, hypoeutectic and hyperectectic.

Response:

We apologize for making the confusion in the manuscript. ‘hypoeutectic’ and ‘hyperectectic’ were widely used as the terminology in the previous researches. Thus, we revise the terminal of ‘hypoeutectic’ and ‘hyperectectic’ in the manuscript.

3.Before using the term, PM, please define it somewhere.

Response:

We apologize for making the confusion in the manuscript. In the part of Experiments, we have defined the PM. The corresponding definition of PM has also highlighted in the red color in the manuscript.

To study the effects of composite powder particles, the powder mixture (PM) containing the same powdered components without the binder as CPP was selected as the reference sample.

4.Please add some references for the wear mechanisms you mentioned. Are they a new finding or important result that should be included in the abstract and conclusion?

Response:

Thanks for your kind suggestion. We have added some references about the wear mechanisms. Thewearmechanisms in this study is very important, thus included in the abstract and conclusion. The corresponding parts have been revised and highlighted in the red color in the manuscript.

  1. 22. Ren S, Zhu J. The effect of substitutional alloying elements on the impact wear rate of medium carbon steels related to delamination and quasi-nanometer wear mechanisms. Materials Science and Engineering A, 2011, 528, 7020– 7023. https://doi.org/10.1016/j.msea.2011.05.082
  2. Ren S, Zhu J. Wear mechanisms and hardness thresholds under repeated impact contact loading. Science China Technological Sciences, 2017, 61, 124-128. https://doi.org/10.1007/s11431-016-9145-1.

5.You said that the composite powder particles can be also used as the consumable of laser welding. However, I could not find any information that made you conclude like that.

Response:

We apologize for making the confusion in the manuscript. We have deleted the sentence “Moreover, composite powder particles introduced in this paper can be also used as a consumable of laser welding ”. The sentence is based on our forecast on the future application of composite powder particles because its color is black and can absorb more laser. We decide to delete it after considering the opinion of the reviewer.

 6.Careful proofreading by a native English speaker is recommended.

Response:

Thanks for your kind suggestion. The typos and grammar errors in the manuscript have been carefully checked and revised by the native English speaker.

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