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[ÇóÖú] ÇëÎʱ» materials letters ¾Ü¸åºó»¹ÄÜÔÚÐ޸ĺóÖØÐÂͶ¸åËüÂð ÒÑÓÐ5È˲ÎÓë

ÈçÌ⣬Ͷ¸åmlµÄһƪÎÄÕÂÉóÁËÒ»¸öÔÂÖ®ºó£¬½ñÈÕ¿´µ½ÓʼþÖ±½Óreject£¬»¹Ëãµ­¶¨£¬Ê×ÏÈ×Ô¼º×¼±¸µÄÒ²ÊDz»³ä·Ö£¬²»¹ýºÜ¸ÐлÄÇλ±à¼­ÀÏʦ¸øµÄÒâ¼û£¬Ð´Á˰ѾÅÌõ£¬ÌرðÏêϸ£¬Ò²±È½ÏÖпϣ¬ÎÒ¸´ÖÆÕ³ÌùÒ»ÏÂÓʼþÔ­ÎÄ£¬Çëǰ±²Ãǰïæ¿´¿´£º
thank you for submitting the above paper.

we have now received comments on your paper and regret to say that we must turn this paper down.  the reviewer recommended that a major revision is needed.  based on the policy of the journal, a major revision is a mandatory rejection.

for your guidance, comments from the review/s are appended below.

thank you for giving us the opportunity to consider your work. we will be happy to receive other contributions from you.

yours sincerely,

professor jenn-ming yang
editor

materials letters

editor's/reviewers' comments:


reviewer #1: the present article is certainly providing a new knowledge on fabrication of inconel 718 components using waam technology. in general, it is well organized, and it can be considered for publication provided the following issues could be addressed or clarified in the article:
(1) in the introduction, the reference [9] cannot be tracked in the journal of mechanical engineering, it has not been found published elsewhere. please address it.

(2) authors should introduce the cp-gtaw acronym when it first appeared in the manuscript.

(3) what does it mean by the term 'section shrinkage' at the line 4 in the first paragraph of experimental section?

(4) due to the pulse frequency in the range of 1khz to 100khz as authors introduced, what is the rational for selecting frequency of 40hz for this study? was it an optimized parameter from previous experiment? what is the influences of frequency on material property?

(5) where were the metallographic samples selected from the as-deposited block? were they from vertical cross-section or horizontal plane? since anisotropic mechanical properties were observed for build sample, are there any significant differences in the microstructure at various locations? also, the correlations between microstructure and mechanical strength should be discussed comprehensively for this research.

(6) provide clear images and markings for fig.1, bit difficult to read.

(7) in conclusion, the grains were refined by ultra-high frequency pulsed arc. the decrease of laves phase and mc carbides should be attributing to the post-heat treatment as indicated in discussion. please make a correct description.

(8) language is readable but really falls short of the standard required for a journal publication. i would suggest that it may be useful to engage a professional english language editor following an improvement of the paper.

(9) this study provides information of material property analysis on inconel 718 structures fabricated by pulse arc additive manufacturing using high frequency. the novelty and impact of this article have, to some extent, shortcomings in my view. many previous researchers, see attached references [1-3], have been working in this field and similar results of grain refinement to this study have been reported when high pulse frequency. therefore, this manuscript would be better if authors could discuss the difference in inconel alloy deposition when the proposed manufacturing process used.
reference

[1] q. wu, z. ma, g. chen, c. liu, d. ma, s. ma, obtaining fine microstructure and unsupported overhangs by low heat input pulse arc additive manufacturing, journal of manufacturing processes 27 (2017) 198-206.
[2] f. wang, s. williams, m. rush, morphology investigation on direct current pulsed gas tungsten arc welded additive layer manufactured ti6al4v alloy, the international journal of advanced manufacturing technology 57(5-8) (2011) 597-603.
[3] j. guo, y. zhou, c. liu, q. wu, x. chen, j. lu, wire arc additive manufacturing of az31 magnesium alloy: grain refinement by adjusting pulse frequency, materials 9(10) (2016) 823.


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