scholarly journals Multi-Scale Modeling of Microstructure Evolution during Multi-Pass Hot-Rolling and Cooling Process

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2947
Author(s):  
Xian Lin ◽  
Xinyi Zou ◽  
Dong An ◽  
Bruce W. Krakauer ◽  
Mingfang Zhu
Keyword(s):  
Grain Size ◽  
Strain Rate ◽  
Microstructure Evolution ◽  
Hot Rolling ◽  
Rolling Process ◽  
Air Cooling ◽  
Stored Energy ◽  
Multi Scale ◽  
Hot Rolling Process ◽  
Ca Model

In this work, a 6-pass hot-rolling process followed by air cooling is studied by means of a coupled multi-scale simulation approach. The finite element method (FEM) is utilized to obtain macroscale thermomechanical parameters including temperature and strain rate. The microstructure evolution during the recrystallization and austenite (γ) to ferrite (α) transformation is simulated by a mesoscale cellular automaton (CA) model. The solute drag effect is included in the CA model to take into account the influence of manganese on the γ/α interface migration. The driving force for α-phase nucleation and growth also involves the contribution of the deformation stored energy inherited from hot-rolling. The simulation renders a clear visualization of the evolving grain structure during a multi-pass hot-rolling process. The variations of the nonuniform, deformation-stored energy field and carbon concentration field are also reproduced. A detailed analysis demonstrates how the parameters, including strain rate, grain size, temperature, and inter-pass time, influence the different mechanisms of recrystallization. Grain refinement induced by recrystallization and the γα phase transformation is also quantified. The simulated final α-fraction and the average α-grain size agree reasonably well with the experimental microstructure.

Numerical Simulation of Rolling Process and Microstructure Evolution of AM50 Mg Alloy during Hot Rolling Process

2011 ◽  
Vol 291-294 ◽  
pp. 449-454 ◽  
Author(s):  
Fuan Hua ◽  
Chao Yi Zhang ◽  
Qiang Li ◽  
Bao Yi Yu ◽  
Wei Hua Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Grain Size ◽  
Microstructure Evolution ◽  
Hot Rolling ◽  
Heating Temperature ◽  
Simulation Method ◽  
Rolling Process ◽  
Mg Alloy ◽  
Hot Rolling Process ◽  
Rolling Method

In order to optimize rolling process of AM50 Mg alloy, numerical simulation method is adopted to find reasonable process parameters. And then, the metallograph was viewed to find the microstructure evolution during hot rolling process. Through numerical simulation it is found that while the heating temperature is 420 and the train less than 0.33 each time. Through 10 times rolling, a 10mm thickness plate was rolled to 0.5mm, and its grain size also decreases to 10μm, which indicates that AM50 Mg alloy can be formed by hot rolling method.

Numerical Simulation of Microstructure Evolution during Continuous Hot Rolling Process of GCr15 Steel Rod

2021 ◽  
Vol 1016 ◽  
pp. 1733-1738
Author(s):  
Li Wen Zhang ◽  
Fei Li ◽  
Chi Zhang ◽  
Pei Gang Mao ◽  
Chao Qun Li
Keyword(s):  
Grain Size ◽  
Finite Element ◽  
Microstructure Evolution ◽  
Hot Rolling ◽  
Rolling Process ◽  
Equivalent Strain ◽  
Austenite Grain Size ◽  
Gcr15 Steel ◽  
Hot Rolling Process ◽  
Austenite Grain

In this paper, the microstructure evolution during continuous hot rolling process of GCr15 steel rod was investigated. A series of multi-field coupled finite element models were established based on commercial finite element software MSC.Marc. The kinetics equations of austenite grain size evolution of GCr15 steel were coupled to these models by a designed MSC.Marc subprogram. The field variables, including temperature, equivalent stress, equivalent strain, and equivalent strain rate, were calculated. The distributions of dynamic recrystallization, metadynamic recrystallization, and static recrystallization fractions were investigated. The distribution and evolution of austenite grain size at different stages in the continuous hot rolling process were analyzed. To verify the models, the temperatures of GCr15 steel rod at different stages in the continuous hot rolling process were measured. And the austenite grain sizes at cross section of the rod after the continuous hot rolling process were measured. The simulation results show a good agreement with the experimental results.

Impact Analysis of Microstructure Evolution in Hot Rolling of H-Beams

2013 ◽  
Vol 652-654 ◽  
pp. 2024-2028
Author(s):  
Wen Ping Liu ◽  
B. Zhang ◽  
Pei Qi Wang ◽  
Qin He Zhang
Keyword(s):  
Microstructure Evolution ◽  
Hot Rolling ◽  
Mechanical Model ◽  
Impact Analysis ◽  
Rolling Process ◽  
Time Interval ◽  
Hot Rolling Process ◽  
Finite Element Package ◽  
H Beam ◽  
Rough Rolling

To improve the product properties of H-beams, it is essential to understand the effects of hot rolling parameters on the microstructure evolution of the beams. For this purpose, a thermo mechanical model was built with the finite element Package ABAQUS. By re-meshing the model, multipass large-deformation hot rolling process was simulated under the boundary conditions predefined in accordance with the practical production. Based on the hot rolling simulation, an impact analysis of strain rate, initial rough rolling temperature, and time interval between passes on the microstructure evolution of H-beam austenite was conducted. The analytical results are meaningful for optimizing hot rolling parameters and improving H-beam properties.

Simulation of Multipass Hot Rolling for 7050 Aluminum Alloys

2016 ◽  
Vol 846 ◽  
pp. 145-150
Author(s):  
Yang An ◽  
Peter Hodgson ◽  
Chun Hui Yang
Keyword(s):  
Aluminum Alloys ◽  
Microstructure Evolution ◽  
Hot Rolling ◽  
Subgrain Size ◽  
Local Strain ◽  
Rolling Process ◽  
Hot Rolling Process ◽  
Mechanical Evolution ◽  
Mechanical Behaviours ◽  
Parametric Studies

To determine the relations between rolling passes, mechanical behaviours and microstructure evolution of AA7050 aluminum alloys, finite element modeling of a multipass hot rolling process is developed and employed to investigate thermo-mechanical evolution during this processing. Through parametric studies, the distribution of local strain and temperature across thickness during the hot rolling process are numerically determined. These results are used to determine the subgrain size and thus the microstructure evolution during the hot rolling process are estimated.

Multi-field coupled numerical simulation of microstructure evolution during the hot rolling process of GCr15 steel rod

2011 ◽  
Vol 50 (7) ◽  
pp. 1951-1957 ◽  
Author(s):  
Sen-dong Gu ◽  
Li-wen Zhang ◽  
Chong-xiang Yue ◽  
Jin-hua Ruan ◽  
Jian-lin Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Microstructure Evolution ◽  
Hot Rolling ◽  
Rolling Process ◽  
Gcr15 Steel ◽  
Hot Rolling Process

Microstructures and Strength of Hot-Rolled Mg-Zn-Y Alloys

2011 ◽  
Vol 291-294 ◽  
pp. 137-140
Author(s):  
Yao Min Zhu ◽  
Qiu Ran Gao ◽  
Feng Zhang Ren ◽  
Shi Jie Fang
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Hot Rolling ◽  
Rolling Process ◽  
Recrystallization Process ◽  
Fine Grained ◽  
Hot Rolling Process ◽  
Fine Grained Structure ◽  
Cast Alloys ◽  
Hot Rolled

The effects of the hot-rolling process on microstructures and strength were investigated for two kinds of magnesium alloy Mg-Zn-Y and Mg-Zn-Y-Nd. In comparison with the as-cast alloys, the tensile strength of Mg-Zn-Y and Mg-Zn-Y-Nd both increases 45%, whereas their elongation decreases 73%, 60% via hot-rolling process, respectively. The results show that the dynamic recrystallization process and the pining effect of I-phase during hot rolling contribute to the fine-grained structure formation. The hot-rolling process has refined the grain size greatly.

scholarly journals The Role of Elements Partition and Austenite Grain Size in the Ferrite-Bainite Banding Formation during Hot Rolling

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2356
Author(s):  
Yina Zhao ◽  
Yinli Chen ◽  
He Wei ◽  
Jiquan Sun ◽  
Wei Yu
Keyword(s):  
Grain Size ◽  
Hot Rolling ◽  
Heating Temperature ◽  
Rolling Process ◽  
Heating Time ◽  
Cast Slab ◽  
Austenite Grain Size ◽  
Hot Rolling Process ◽  
Austenite Grain ◽  
And Diffusion

The partitioning and diffusion of solute elements in hot rolling and the effect of the partitioning and diffusion on the ferrite-bainite banding formation after hot rolling in the 20CrMnTi steel were experimentally examined by EPMA (electron probe microanalysis) technology and simulated by DICTRTA and MATLAB software. The austenite grain size related to the hot rolling process and the effect of austenite grain size on the ferrite-bainite banding formation were studied. The results show that experimental steel without banding has the most uniform hardness distribution, which is taken from the edge of the cast slab and 1/4 diameter position of the cast slab, heating at 1100 °C for 2 h and above 1200 °C for 2–4 h during the hot rolling, respectively. Cr, Mn, and Si diffuse and inhomogeneously concentrate in austenite during hot rolling, while C homogeneously concentrates in austenite. After the same hot rolling process, ΔAe3 increases and ferrite-bainite banding intensifies with increasing initial segregation width and segregation coefficient K of solute elements. Under the same initial segregation of solute elements, ΔAe3 drops and ferrite-bainite banding reduces with increasing heating temperature and extension heating time. When ΔAe3 drops below 14 °C, ferrite-bainite banding even disappears. What is more, the austenite grain size increases with increasing heating temperature and extension heating time. When the austenite grain size is above 21 μm, the experimental steel will not appear to have a banded structure after hot rolling.

3-D Simulation of H-Beam Multi-Pass Hot Rolling and Microstructure Evolution

2012 ◽  
Vol 268-270 ◽  
pp. 297-300
Author(s):  
Qing Qiang He ◽  
Jia Sun ◽  
Jun You Zhao ◽  
Li Jian Xu ◽  
Cui Cui Li
Keyword(s):  
Grain Size ◽  
Microstructure Evolution ◽  
Hot Rolling ◽  
Evolution Equations ◽  
Three Dimensional ◽  
Fem Simulation ◽  
Rolling Process ◽  
Austenite Grain Size ◽  
Average Value ◽  
H Beam

In hot metal forming processes, the material is subjected to the thermo-mechanical processing. A fully three dimensional thermo-mechanically coupled FEM-simulation of an eleven pass hot rough rolling process of H-beam has been performed. Microstructure evolution equations available in literatures were incorporated into the commercial FE solver ABAQUS/Explicit, through user defined subroutine VUMAT, to simulate the microstructure evolution. Since it’s impractical to obtain the austenite grain size distribution in the beam blank during industrial hot rolling, the calculated rolling loads are compared with the mills loads instead of grain size comparison between the predicted average value and the real ones.

Plain Carbon Strip Q235 Grain Growth in Reheating Progress

2012 ◽  
Vol 528 ◽  
pp. 172-175
Author(s):  
Chun Li Mo ◽  
Shou Peng Du ◽  
Xu Ming Guo ◽  
Lie Shan Cui
Keyword(s):  
Grain Size ◽  
Carbon Steel ◽  
Grain Growth ◽  
Hot Rolling ◽  
Physical Simulation ◽  
Rolling Process ◽  
Plain Carbon Steel ◽  
Kinetics Equation ◽  
Reheat Furnace ◽  
Hot Rolling Process

Before hot rolling the ingot of plain carbon steel Q235 should be heated to austenite temperature to decrease distortion resistance. The grain size will affect the following hot rolling process. In this paper, the behaviour of Q235 grain growth in reheat furnace was studied with the method of physical simulation. To achieve the equation of grain growth in heating progress, the samples was carried out in different peak temperature and holding time at the Gleeble1500. With the kinetics equation grain size can be calculated and the results provide a basis for the setting of progress parameter during reheating of ingot.

Sign in / Sign up

Export Citation Format

Share Document