Computer-Integrated Platform for Automatic, Flexible, and Optimal Multivariable Design of a Hot Strip Rolling Technology Using Advanced Multiphase Steels
, Krzysztof Bzowski 1,*, Roman Kuziak 2, Pello Uranga 3, Isabel Gutierrez 3, Nerea Isasti 3, Ronan Jacolot 4, Jacek Kitowski 5 and Maciej Pietrzyk 1
Round 1
Reviewer 1 Report
The paper treat a complex problem of the multi-parameters optimal design concerning a hot strip rolling process suing Multiphysics and Multiscale numerical finite element modelling associated to direct observation process data and parameters identification by non-linear regressions and inverse analysis technique. A thermal-mechanical constitutive behaviour on mesoscopic scale taking into account microstructure variables kinetics using based physical equations is used. An integrated computer design platform named VirtRoll is described together with real applications concerning the set of optimal rolling conditions in terms of sheet velocity, temperature, rolling pass time and rolling reduction based on three special strength steel defined by different initial principal structures: austenitic, bainitic and feritic.
The authors use a very well structured content easy to read and understanding using in first half part a narrative but useful description of VirtRoll modulus software, used materials and frame of principal relationships which characterises the used micro-thermal-mechanical constitutive models.
A lot of minor corrections are required to reinforce quality paper.
In a first time the title can be changes as “Computer Integrated Platform for automatic, flexible and optimal multi-variables design of a hot strip rolling technology using advanced multiphase steels”.
The Abstract speak about “Experimental tests were performed to generate data for identification of the models. These include plastometric tests, two step compression tests and dilatometric tests. Following this physical simulations of rolling cycles were performed on Gleeble 3800 to supply data for verification and validation of the models”. Poor data and results are illustrate in the paper content concerning these points especially concerning Gleeble 3800 validations. “This physical simulations” sequence must be change into “These physical simulations”.
It is also required to define all variables and quantities as Re, Rm (page 14), FB, FM (page 21) together with the used weight factor values of wBM and wB in equation (11) explaining the physical sense of choice and final value of objective function defined by Eq. 11. If possible to add the kinetics equation of the recrystallization together with the whole constitutive rheological model used into the finite element modelling. Only a lot of principal stress equations are presented and are missing the coupling of the stress variation formulation of analysed multi-phase steel together with the grains size influences and its kinetics.
To valid all results of optimization part 5.3 it is required to plot also graphs of comparisons between rolling forces and/or rolling torques obtained from experimental observation and numerical simulation ones according to the optimization procedure results. It can be then possible to conclude on the whole coherency of models with respect to the direct global experimental observed data.
A synthesis discussion part 5.5 named Synthesis Discussions will be appreciated to define all final optimization rolling process variables corresponding to analysed steels together with obtained performances and required objectives.
Consequently the paper must be accepted for publication in the Metals International Revue following above asked few minor corrections in a revised version.
Author Response
Authors would like to express their thanks for the constructive comments to the paper. All changes made in the text are marked in yellow. Detailed answers to the comments are attached to this response.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
This paper summarized the capability of computer system for designing hot strip rolling technology for advanced steels. Overall, this paper contains outstanding research activities regarding virtual experiments. However, it has some distracting points and it needs some revisions.
On page 5
-lines 177-182, the sequence of metals is HSLA, Bainitic steel, AHSS. However, in the next explanation, some times Bainitic steels comes first. It makes readers to feel unnatural.
-regarding Fig. 2, it is better to use more intuitive symbols or explanation about symbols of rolling coiling temperature and heating.
On page 6
-3.3 Microstructures à 3.2 Microstructures
On page 9
-In the caption of Fig. 5, …(a,c,e) (a) and S404, typo.
-lines 253-254, 500 deg is missing.
On page 11
-3.2 Mechanical properties à 3.3 Mechanical properties
On page 12
-Regarding Fig. 9, the whole figure looks same to Fig. 8.
On page 13
-line 356, radiuses
On page 14
-regarding Eqs. 3 and 4, comment Re and Rm.
On page 15
-regarding Fig. 15, explicitly comment name of metal (S406).
On page 22
-5.4 Effect of precipitation on mechanical properties à 5.5 …
Author Response
Authors would like to express their thanks for the constructive comments to the paper. All changes made in the text are marked in yellow. Detailed answers to the comments are attached to this response.
Author Response File: Author Response.pdf
