Experimental and FE analysis of void closure in hot rolling of stainless steel

Faini, F; Attanasio, Aldo; Ceretti, Elisabetta

doi:10.1016/j.jmatprotec.2018.04.033

Cited by 33 publications

(20 citation statements)

References 16 publications

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“…In caliber rolling, damage evolves at elevated temperatures, where the microstructure undergoes constant changes due to recrystallization and recovery during plastic flow, which could influence the damage evolution at microscopic scale. For instance, existing voids can be healed due to recrystallization, as described by Wang et al [10] and Faini et al [11]. To study the effect of non-proportional loading path at elevated temperature, the evolution of microstructure needs to be considered and its effect should be ideally separated from that of the loading path.…”

Section: Introduction and State Of The Artmentioning

confidence: 99%

Torsion plastometer trials to investigate the effect of non-proportional loading paths in caliber rolling on damage and performance of metal parts

Wang

Dunlap

Möhring

et al. 2020

Prod. Eng. Res. Devel.

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The non-proportional loading path describes a strain-dependent development of stress triaxiality and Lode parameter during metal forming processes. Existing studies suggest a strong dependence of damage evolution on the non-proportional loading path. This work focuses on investigating the influence of non-proportional loading paths observed in hot caliber rolling of the case-hardening steel 16MnCrS5 using laboratory scale experiments. The applied torsion plastometer is highly flexible as it can apply combined loading types (tension, compression and torsion) on notched round specimen and enables deformation at elevated temperature. In this study, two characteristic non-proportional loading paths in caliber rolling and the maximal achievable non-proportional loading path variation were recreated in the torsion plastometer based on both FE simulations and experiments. After deformation, the specimen were further analyzed using Scanning Electron Microscopy (SEM) to quantify the damage. The results indicate an influence of the non-proportional loading path on damage evolution. Furthermore, fatigue tests were employed to characterize the fatigue performance of the deformed specimens. In the torsion plastometer trials carried out no clear correlation of performance and damage was observed. This is most likely due to differences in residual dislocation density after static recrystallization and deviations in the microstructure after hot working. Thus, the superposition of microstructure evolution and damage needs to be considered carefully when testing at elevated temperature.

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Section: Introduction and State Of The Artmentioning

confidence: 99%

Torsion plastometer trials to investigate the effect of non-proportional loading paths in caliber rolling on damage and performance of metal parts

Wang

Dunlap

Möhring

et al. 2020

Prod. Eng. Res. Devel.

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show abstract

“…Nalawade et al [ 28 ] studied the effect of temperature, rolling torque, and void volume fraction on void closure during hot rolling. Faini et al [ 29 ] also studied void closure using hot‐rolling simulations for steel material and obtained a correlation with percentage reduction, cooling time, and location of void. It is observed that high temperatures, compressive stresses, and diffusion help in crack healing and induce closure.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of Void Closure during Steckel Mill Rolling for Steel Plate

Ganguly

Wang

Chandrashekhara

et al. 2020

steel research int.

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Internal void defects as shrinkage porosity, gas bubble, and thermo‐mechanical cracks are usually formed during steel casting processes. These defects have critical impact on the quality and service life of hot‐rolled products. Study of the possibility of self‐healing of existing internal defects during hot‐rolling process has been of interest to industry and researchers. Prediction of void closure is extremely useful in relation to better product design and manufacturing process optimization. Herein, a 3D finite element model of the slab hot‐rolling process is developed to simulate and analyze the healing of internal voids in hot‐rolled steel plate. The material model for the steel plate is developed based on Johnson–Cook constitutive relation to accurately represent its viscoplastic behavior at high temperatures as well as account for strain rate sensitivity. The study evaluates the thermal and mechanical response of low‐carbon steel slabs having pre‐existing voids during multi‐pass strands reverse hot‐rolling process. Through thickness plastic strains within the slab are found to influence void closure. Results show that variation in void size and locations also affect the healing possibilities. Finally, the effect of thermal history and thermo‐mechanical stresses on void closure is studied.

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“…The third approach involves using direct industrial installation to analyse defect evolution. Faini et al [20] used this approach to evaluate a multistage rolling process of long products by comparison with FEM analysis. In this modelling, the Q factor and the effective strain level are used to evaluate the forming route capacity with regard to defect closure.…”

Section: Introductionmentioning

confidence: 99%

FEM-Based Methodology for the Design of Reduced Scale Representative Experimental Testing Allowing the Characterization of Defect Evolution during Hot Rolling of Bars

Pondaven

Langlois

Bigot

et al. 2020

Metals

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Defects generated during the casting process of steel can be reduced by forming processes such as hot rolling. During these processes the effective strain, the temperature, the stress state and the alternation of the forming direction all influence the defect evolution. Analytical or numerical models are available in the literature to predict the defect evolution. However, experiments have to be carried out to identify the parameters of these models. Thus, the quality of the identification depends on the representativeness of the experiments with respect to the industrial forming process. This paper proposes a methodology to design reduced scale experiments with an improved level of representativeness. This methodology consists first in the identification of the thermomechanical parameters driving the defect evolution and the quantification of these parameters in the industrial process by FEM simulation. These last results are then utilised as criteria for the representative experiment design. In this work the methodology is applied to the rolling of bars. The representative experiment consists of successive forming operations of a cylindrical sample between shaped anvils reproducing the roll shape at a 1:10 scale. A validation is finally achieved by reproducing qualitative results concerning the evolution of voids in the vicinity of hard inclusions.

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Experimental and FE analysis of void closure in hot rolling of stainless steel

Cited by 33 publications

References 16 publications

Torsion plastometer trials to investigate the effect of non-proportional loading paths in caliber rolling on damage and performance of metal parts

Torsion plastometer trials to investigate the effect of non-proportional loading paths in caliber rolling on damage and performance of metal parts

Modeling and Simulation of Void Closure during Steckel Mill Rolling for Steel Plate

FEM-Based Methodology for the Design of Reduced Scale Representative Experimental Testing Allowing the Characterization of Defect Evolution during Hot Rolling of Bars

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