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From:
Additive Manufacturing <em@editorialmanager.com>Date: Sun, Feb 6, 2022 at 9:12 AM
Subject: Decision on submission to Additive Manufacturing
To: Ori Yeheskel <
oriyehe@gmail.com>
CC:
kenta.yamanaka.c5@tohoku.ac.jp
Manuscript Number: ADDMA-D-21-03376
Anelastic phenomena at room temperature in Ti6Al4V produced by electron beam melting
Dear Dr Yeheskel,
Thank you for submitting your manuscript to Additive Manufacturing.
I have completed my evaluation of your manuscript. The reviewers recommend reconsideration of your manuscript following revision and modification. I invite you to resubmit your manuscript after addressing the comments below. Please resubmit your revised manuscript by Feb 27, 2022.
When revising your manuscript, please consider all issues mentioned in the reviewers' comments carefully: please outline every change made in response to their comments and provide suitable rebuttals for any comments not addressed. Please note that your revised submission may need to be re-reviewed.
To submit your revised manuscript, please log in as an author at
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Additive Manufacturing values your contribution and I look forward to receiving your revised manuscript.
Kind regards,
Kenta Yamanaka
Associate Editor
Additive Manufacturing
Editor and Reviewer comments:
- Please use "electron beam powder bed fusion" rather than "electron beam melting".
- Please avoid citing previous work to describe the details but include full details for experiment reproduction, as per the Guide for Authors.
- Section 1.1 could be "2. Theory" and the the experimental section is section 3.
- It is better to describe the material state for the Kang et al. sample.
- The post processing conditions are not the conventional ones (in particular, the super-transus heat treatment is unusual). Thus, it might be better to describe why these conditions were employed.
- In general, deformation twining hardly occurs in Ti-6Al-4V. The fine microstructures in the AB and EX samples hinder deformation twinning. In contrast, twins formed during the β → α' martensitic transformation have been often observed in EB-PBF Ti-6Al-4V alloys. Do the authors suggest that the transformation twins contribute to the anelastic behavior?
- Section 4.3.; The references are relevant to residual stress, not for the dislocation density. The relatively high dislocation density evolved during the EB-PBF process has been demonstrated in literature. Please clarify which one (residual stress or high dislocation density) affects the anelastic response.
- Please check the language of the manuscript carefully.
Reviewer 1: The paper is very interesting and in my opinion very original.
It is very rare paper with impressive and useful results.
I strongly recommend the publication
Reviewer 2: This work is of high quality. It examines the phenomenon of anelasticity for AM Ti64 and it is the first (to my knowledge) attempting to treat the subject. The tool (mathematical model) used for that purpose is not new (it relies/reflects the approach used by Zener in 1940s 50's) but its application is done in a correct and useful way (towards understanding the phenomenon at hand). Overall, this work is novel, it is well performed (from experimental and analytical point-of-view) and it can be a valuable addition to the published literature. I would also expect to open up a discussion on this far less looked phenomenon (with more works attracted by other authors). Currently, there is too much focus on high cycle fatigue properties of AM Ti64, with less efforts made to understand inelasticity and, in this case, anelasticity (as both, in their way, are the source/can explain anisotropic performance - which is an important consideration for all AM alloys and
especially Ti64 due to its many applications).
A few notes, which the authors need to address:
- tau, first introduced in Eq. 4, needs to be explained in detail (as the reference to Zener's work is not sufficient).
- Section 2.1: Please add a table with the basic manufacturing parameters used for the production of the specimens (simply referring to past work is not helpful for the reader)
- Use of the Kang et al [ref.42] data: Can you please include the type of Ti64 and fabrication method (incl. details on the equipment used) which these researchers used? This is important, as the comparison with our own results needs to be with a material which was produced under identical or very similar conditions (i.e. have you considered referring to the work of Agius et al on as built SLM Ti64 cyclic plasticity? published in MSEA and a few other outlets). If not, there needs to be a justification why these past experimental data are used in this case. Please elaborate and add details in the manuscript
- The colour coding in Fig. 6 is not very helpful, as the graph width is rather small. Can you please improve the representation? The same applies to other graphs (consider and apply the same).
- Can you elaborate more on the scatter observed in Fig. 9? It would be helpful to offer some possible explanations (which may also act as hypotheses for further studies by the same or other researchers)
-
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