Deformation behavior of a Nb-Ti-V microalloyed steel to achieve the HSLA X80 grade by simulation with a torsion test and pilot hot rolling mill

Berdjane, D.; Fares, Mohamed Lamine; Baccouche, M.; Lemmoui, A.

doi:10.1051/metal/2012042

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…The most commonly used methods for the physical modelling of rolling processes are the compression test [ 5 , 6 , 7 , 8 , 9 ] and the torsion test [ 10 , 11 , 12 , 13 , 14 ]. These methods, despite the dynamic development of the laboratory equipment, have some limitations.…”

Section: Introductionmentioning

confidence: 99%

Innovative Methodology for Physical Modelling of Multi-Pass Wire Rod Rolling with the Use of a Variable Strain Scheme

Laber

2023

Materials

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This paper presents the results of physical modelling of the process of multi-pass rolling of a wire rod with controlled, multi-stage cooling. The main goal of this study was to verify the possibility of using a torsion plastometer, which allows conducting tests on multi-sequence torsion, tensile, compression and in the so-called complex strain state to physically replicate the actual technological process. The advantage of the research methodology proposed in this paper in relation to work published so far, is its ability to replicate the entire deformation cycle while precisely preserving the temperature of the deformed material during individual stages of the reproduced technological process and its ability to quickly and accurately determine selected mechanical properties during a static tensile test. Changes in the most important parameters of the process (strain, strain rate, temperature, and yield stress) were analyzed for each variant. After physical modelling, the material was subjected to metallographic and hardness tests. Then, on the basis of mathematical models and using measurements of the average grain size, chemical composition, and hardness, the yield strength, ultimate tensile strength, and plasticity reserve were determined. The scope of the tests also included determining selected mechanical properties during a static tensile test. The obtained results were verified by comparing to results obtained under industrial conditions. The best variant was a variant consisting of physically replicating the rolling process in a bar rolling mill as multi-sequence non-free torsion; the rolling process in an NTM block (no twist mill) as non-free continuous torsion, with the total strain equal to the actual strain occurring at this stage of the technological process; and the rolling process in an RSM block (reducing and sizing mill) as tension, while maintaining the total strain value in this block. The differences between the most important mechanical parameters determined during a static tensile test of a wire rod under industrial conditions and the material after physical modelling were 1.5% for yield strength, approximately 6.1% for ultimate tensile strength, and approximately 4.1% for the relative reduction of the area in the fracture and plasticity reserve.

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Section: Introductionmentioning

confidence: 99%

Innovative Methodology for Physical Modelling of Multi-Pass Wire Rod Rolling with the Use of a Variable Strain Scheme

Laber

2023

Materials

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“…High strength low carbon microalloyed steels (HSLA) have been developed to meet the needs of typical industrial applications, such as pipeline production, automotive industry and other structural workpieces (e.g., chassis components, bumpers for heavy‐duty vehicles, cranes and cement mixer, railway vehicle, etc)…”

Section: Introductionmentioning

confidence: 99%

“…With regard to steel composition, among the many alloying elements which play a crucial role in achieving the final properties of materials, V, Nb, and Ti microalloying elements are the most promising on account of their exceptionality to act as grain refiners either directly by solute drag or pinning effect when forming an homogeneous distribution of nitrides and complex carbonitrides into the matrix . Nevertheless, these precipitates usually exhibit a negative effect depending on their nature, volume fraction and size, especially when they lie located within and near grain boundaries, acting as sites for void nucleation and stress risers that can seriously impair ductility during straightening operation .…”

Section: Introductionmentioning

confidence: 99%

Comparing the Hot Ductility Behaviour of Low‐Carbon Microalloyed Nb‐V‐Ti Steels During Two Thermal Cycling Routes: Solutionizing and Precipitation Treatments

Fares

Darsouni

Coze

2014

steel research int.

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The hot ductility behavior of commercial low-carbon microalloyed Nb-V-Ti-steel was studied in both wrought and cast conditions by means of hot tensile tests over a wide range of temperature (750-1200 8C) and at three strain rates (0.01, 0.002 and, 0.0005 s À1 ). To replicate the straightening operation undergone by the two materials during hot drawing of plates and continuous casting process, respectively, two kinds of thermal cycles, namely solutionizing and precipitation treatments, were adopted to compare their respective influence on the formation of surface cracking. After deformation, the lowest ductility values were found at 900 8C in the single g-domain for the as rolled material in the former treatment, and at 800 8C in the two-phase domain for the as cast product in the second one. By contrast, the largest values were observed at 750 8C and above 1000 8C for the two examined materials in both types of treatment. On the whole, surface cracking was found as a result of grain boundary sliding which was acknowledged as the main fracture mechanism. An attempt was also made to determine a relationship between the synergistic effect of the various intervening micromechanisms and the resulting embrittlement.

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Response surface methodology to predict the mechanical properties of hot-rolled sheets

et al. 2013

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Deformation behavior of a Nb-Ti-V microalloyed steel to achieve the HSLA X80 grade by simulation with a torsion test and pilot hot rolling mill

Cited by 5 publications

References 3 publications

Innovative Methodology for Physical Modelling of Multi-Pass Wire Rod Rolling with the Use of a Variable Strain Scheme

Innovative Methodology for Physical Modelling of Multi-Pass Wire Rod Rolling with the Use of a Variable Strain Scheme

Comparing the Hot Ductility Behaviour of Low‐Carbon Microalloyed Nb‐V‐Ti Steels During Two Thermal Cycling Routes: Solutionizing and Precipitation Treatments

Response surface methodology to predict the mechanical properties of hot-rolled sheets

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