Research of Feeding Effect of Ductile Cast Iron under Different Riser Conditions
Round 1
Reviewer 1 Report
1.Shrinkage is a common defect of casting especially when the alloy has paste solidification 12 process.- What it means 'paste'
2. How to measure modulus of protypes.
3.C3, authors how they arrived, compressive stress and the flow direction in the mushy zone showed the direction of centripetal direction.
4. ductile expansion would compensate the shrinkage of molten alloy, and a sound casting would 144 be obtained based on the non-riser process.- This is due to graphite expansion or else . Please make clarity in this statement.
5. Page 8, When being poured at 1250 ℃, sound casting would be obtained, ev3en feeding temperature is low, This is somewhat speculative.
Author Response
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Author Response File: 
Author Response.pdf
Reviewer 2 Report
The paper : Research of feeding effect of ductile cast iron under different riser conditions present some experimental results and few simulation results in an industrial field for obtaining of high quality cast iron samples.
In order to be published I think that more technical comments must be done on the phenomena , better interpretation of the simulations can be performed and an improvement in the quality of the comments must be done in the entire article. In this form the article is not suitable for publication in a journal like Metals.
Some few minor corrections must be done in order to increase the article quality:
re-phrase the abstract and move part of the explanations to Introduction section
L31: casting. And - casting and
L58: give information about the furnace brand and melting parameters
L60: how was the chemical composition determined ? what percentages are given ?, wt or at %? provide information about the equipment used for chemical composition determination, number of determinations, standard deviation etc.
L70: insert a reference about the coated sand material (chemical composition, mechanical properties etc.)
L90: replace Table 3 with a paragraph
L90: explain HTC
L181: give a scale in figures 8 a-c (mm or cm)
L203: Figure 10: what is scale -20000 ... 20000
L211: Figure 11: what is scale -20000 ... 20000
L220: Figure 12: what is scale -20000 ... 20000
L225: provide a reference for equations: 1-2
L270: better structure the conclusions
Author Response
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Author Response File: Author Response.pdf
Reviewer 3 Report
- The simulation results should be presented for all variants. It will be more readable.
- I do not understand what it is "... a small lifting bag...". Line 76. I have similar comments regarding the signatures in Fig. 2.
- I do not understand what it is "...sound castings..." line 187
- There are numerous editorial errors in the work.
- Lines 69-70: "To manufacture the prototypes, all the molds were made of coated sand." It is not a rigid form. In Table 3, the stiffness of the casting mold has been misclassified.
-
The parameter characterizing the liquid metal is the metallurgical quality QM. It speaks of the ability to graphitize, to precontractile expansion, to changes in specific volume with a decrease in temperature, and to the tendency to form contractile cavities.
There are no data on the number of graphite particles per mm2, etc.
-
In the literature, you can find the following designations for the feeding methods of ductile iron castings:
CR - Conventional Risering - traditional power supply,
AR - Applied Risering - power supply with the use of graphitization,
PCR - Pressure Control Risering - power supply with partial use of graphitization pressure,
DAR - Directly Applied Risering - power supply with full use of graphitization pressure,
RL - Riserless Design - non-overflow power supply.
Despite some doubts, the article is interesting. Numerical analysis is supported by the validation of the results in real conditions. I believe that after the amendments, it will be a valuable source of information for practical applications in foundries.
Author Response
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Author Response File: Author Response.pdf
Round 2
Reviewer 2 Report
L94: how was the spheroidization rate was determined ?
mention in text comments for figure 2 c)
add a scale on figures 7,8 and 9 a-c)
Author Response
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Author Response File: Author Response.pdf
Reviewer 3 Report
I accept the answers contained in authors response. I think the article presents an interesting issue regarding the methods of feeding ductile iron castings.
The work uses forms made of resin-coated sands. This is an interesting case that, in my experience, is not widely used in ductile iron production. Therefore, I believe that the work will be valuable to scientists and foundries that work with this type of mold and ductile irons.
I recommend the article for printing in Metals journal.
Author Response
Dear Reviewer:
Thank you very much for your careful review, valuable comments and recommendation for printing in Metals journal.
