Influences of Surface, Heat Treatment, and Print Orientation on the Anisotropy of the Mechanical Properties and the Impact Strength of Ti 6Al 4V Processed by Laser Powder Bed Fusion
, Fernando Warchomicka 2, Carlos Belei 2, Sandra Schäfer 3, Andreas Schindel 3, Gregor Palcynski 3, Reinhard Kaindl 1, Wolfgang Waldhauser 1 and Christof Sommitsch 2
Round 1
Reviewer 1 Report
I think the language of this article is poor and cannot express the content of the article. For example：
a. "L-PBF" in title should be replaced by full name.
b. Ti64 should be explained to be the abbreviation of Ti6Al4V.
c. The abstract and conclusion should be condensed.
......
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Reviewer 2 Report
The authors studied the effects of different parameters and building directions on the density and surface roughness of L-PBF built Ti6Al4V, the samples were treated using heat treatment, HIP, and electrolytic polishing, and then the mechanical properties and impact strength were analyzed. The results are interesting. However, the manuscript was badly organized and written. Before it can be published in the journal, the English really needs to be improved (many mistakes), otherwise it is hard to understand what you want to say.
1. Please add some explanation of Fig.2. I do not see any descriptions of Fig.2
2. The roughness in this paper is line roughness or surface roughness. Please verify it in the manuscript.
3. The tensile curves should be a straight line at the elastic deformation.
4. Some mistakes like in line 319, should be Fig. 7?
Author Response
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Reviewer 3 Report
Please read and perform all the suggested changes in the attached file, I kindly ask you. Paper can be improved.
Comments for author File: Comments.pdf
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Reviewer 4 Report
The article is devoted to an actual topic, namely, the study of the properties of the Ti6Al4V alloy in the process of laser melting and subsequent heat treatment. The article contains a very large amount of research and this makes it difficult to perceive and understand. The paper contains a lot of abbreviations and this complicates the study of the great work results of the authors.
Into some remarks which I hope will help the authors to
to make better the paper before publication:
1. Abstract can be abbreviated, but indicate more quantitative results in it. Now it has a large volume, but little specifics.
2. In the Introduction, very little is considered, namely only 8 articles on the research topic. You need to show previously completed work and indicate how your work differs from them. Here are just a few references that also describe the anisotropy of properties in laser powder melting:
https://doi.org/10.1016/j.msea.2014.10.003
https://doi.org/10.3390/machines8040079
https://doi.org/10.1016/j.actamat.2013.04.036
https://doi.org/10.1016/j.matdes.2013.07.010
About the heat treatment of products or samples obtained by additive methods, there are also previously completed works:
https://doi.org/10.1108/13552541011083371
https://doi.org/10.4028/www.scientific.net/SSP.284.615
I recommend that you familiarize yourself with them and, if necessary, add them to the References.
3. In line 148, references appear to articles [27], [28] and [30]. Up to this point, the paper had [11]. There are other errors in the order of references.
4. In Table 3, the values are given with a significant difference in signs after the ".". In the value 0.0281 (ASTM B265) limits 0.05, so it is worth limiting the precision of the value 0.0281 to 0.03. In the value 3,9, replace "," with ".".
5. Why did the authors of the article not provide a photo of the microstructure before heat treatment, i.e. after fusion? This would show the location of the tracks and the orientation of the dendrites during crystallization. It would be useful for readers to see.
6. Graphs in Fig.6 are difficult to analyze. I propose to show on one graph the influence of the direction of fusion (without heat treatment).
7. The conclusions should indicate the quantitative values obtained during the study, especially with regard to mechanical properties.
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Round 2
Reviewer 1 Report
The language of this article is lengthy and does not conform to the writing standard of scientific and technological literary theory. It is hard to read.
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Reviewer 3 Report
Ok
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Reviewer 4 Report
The authors of the article responded to my comments and significantly improved the paper. I recommend publishing the article in this version.
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