Tensile and impact behaviour of a microalloyed medium carbon steel: Effect of the cooling condition and corresponding microstructure

Ceschini, Lorella; Marconi, A.; Martini, Carla; Morri, Alessandro; Schino, Andrea Di

doi:10.1016/j.matdes.2012.08.063

Cited by 94 publications

(44 citation statements)

References 24 publications

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“…In this way, it is anticipated that the proposed constitutive equation can appropriately predict the flow curves. The obtained equations for n 1 , n 2 , B 1 and B 2 are shown in Fig. 9, and subsequently, the flow curves were calculated by consideration of n 1 and B 1 before and n 2 and B 2 after the peak point of each flow curve and the experimental values of the peak stress and strain were used for these calculations.…”

Section: The Proposed Constitutive Equationmentioning

confidence: 99%

“…3) for flow stress calculation, which is expressed in a simple form including typical parameters, i.e. peak stress and peak strain, and four Z functions of n 1 …”

Section: The Proposed Constitutive Equationmentioning

confidence: 99%

“…Microalloyed or High Strength Low Alloy (HSLA) steels constitute an important category of steels estimated to be around 12% of total world steel production, which have been increasingly used in a variety of automotive components such as connecting rods, wheel hubs, suspension systems, crankshafts and driveline components [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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A simple constitutive model for predicting flow stress of medium carbon microalloyed steel during hot deformation

2015

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 1 A Simple Constitutive Model for Predicting Flow Stress of Medium Carbon Microalloyed Steel during Hot Deformation AbstractThe constitutive behavior of a medium carbon microalloyed steel during hot working over a wide range of temperatures and strain rates was studied using the Johnson-Cook (JC) model, the Hollomon equation, and their modifications. The original JC model was not able to predict the softening part of the flow curves and the subsequent modifications of the JC model to account for the softening stage and the strain dependency of constants were not satisfactory owing to the uncoupled nature of the JC approach regarding strain rate and temperature. The coupled effect of these variables was considered in the form of Zener-Hollomon parameter (Z) and the constants of the Hollomon equation were related to Z. This modification was found to be useful for the hardening stage but the overall consistency between the experimental flow curves and the calculated ones was not good. Therefore, a simple constitutive model was proposed in the current work, in which by utilization of the peak stress and strain into the Hollomon equation, good prediction abilities were attained. Conclusively, the proposed model can be considered as an efficient one for modeling and prediction of hot deformation flow curves.

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Section: The Proposed Constitutive Equationmentioning

confidence: 99%

“…3) for flow stress calculation, which is expressed in a simple form including typical parameters, i.e. peak stress and peak strain, and four Z functions of n 1 …”

Section: The Proposed Constitutive Equationmentioning

confidence: 99%

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A simple constitutive model for predicting flow stress of medium carbon microalloyed steel during hot deformation

2015

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“…The vanadium element could refine grain size significantly, while also enabling formation of tiny V(C, N) particles that prevent crack propagation [16,17]. In addition, the grain refinement effect of vanadium as well as the formation of V(C, N) particles also have an important influence on the ductile-brittle transition temperature [18,19]. Therefore, a moderate addition of vanadium could improve both strength and toughness.…”

Section: Introductionmentioning

confidence: 99%

Effect of Tempering Temperature on the Low Temperature Impact Toughness of 42CrMo4-V Steel

Sun

Liu

et al. 2018

Metals

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Effects of tempering temperature on the microstructures and low temperature impact toughness of 42CrMo4-V steel were investigated. Microstructures of 42CrMo4-V steel after tempering at 570-720 • C for 3 h were experimentally investigated using scanning electron microscopy (SEM), electron back-scattered diffraction (EBSD), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results showed that the carbide precipitation sequence of 42CrMo4-V steel is M 8 C 7 → M 3 C and the absorbed energies of 42CrMo4-V steel increase greatly from 21.7 J to 132.3 J with increasing tempering temperature from 570 • C to 720 • C. The changes of impact toughness with increasing tempering temperature were attributed to the softening of matrix, the evolution of carbide precipitates and grain structures.

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“…A similar situation occurred in other fields of application of structural steels like offshore steel structures or ships, with broadly similar objectives, even though the balance of requirements could vary depending on the specific design or operational needs. Niobium, for its specific thermodynamic and kinetic attitude to form carbide and nitride precipitates, played a key role in the development of modern HSLA steels [1][2][3][4][5][6][7][8]. These steels have certainly made possible the efficient and cost-effective design and the development of construction technologies in a variety of applications.…”

mentioning

confidence: 99%

Niobium Effect on Base Metal and Heat Affected Zone Microstructure of Girth Welded Joints

Schino

Nunzio²

2017

Acta Metall Slovaca

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The development of steels for line pipes during the last decades has been driven by the need to obtain improved combinations of high strength, toughness, weldability on industrial scale at affordable prices. The effect of niobium content on the heat affected zone (HAZ) microstructure is reported in this paper. Niobium, for its specific thermodynamic and kinetic attitude to form carbide and nitride precipitates, played a key role in the development of modern HSLA steels Results show that niobium addition is able to refine both the bainitic packet and cells size in the heat affected zone during welding. This implies that niobium addition leads to an improvement of both toughness and hardness of welded joints manufactured by Nb micro-alloyed steels.Keyword: welded joints, microstructure, precipitation IntroductionThe development of steels for line pipes during the last decades has been driven by the need to obtain improved combinations of high strength, toughness, weldability on industrial scale at affordable prices. A similar situation occurred in other fields of application of structural steels like offshore steel structures or ships, with broadly similar objectives, even though the balance of requirements could vary depending on the specific design or operational needs. Niobium, for its specific thermodynamic and kinetic attitude to form carbide and nitride precipitates, played a key role in the development of modern HSLA steels [1][2][3][4][5][6][7][8]. These steels have certainly made possible the efficient and cost-effective design and the development of construction technologies in a variety of applications. In the field of transportation pipelines, for example, the increase in the available strength level of linepipe that have taken place during the last forty years has produced cumulative benefits valued in the billion-dollar range. The effect of niobium on the microstructure and the properties of the heat affected zone (HAZ) of a girth weld is a very complex issue because of a number of different interrelated mechanisms depending on the chemical composition of the steel and on the welding parameters. In particular it is known that: undissolved precipitates (typically complex (Ti,Nb)(C,N)) have a significant effect on austenite grain size [9][10][11][12]. On the other hand, it is well known that austenite grain size affects the hardenability of the steel and has consequently an influence on the toughness through the packet size of the final microstructure [13][14][15][16];  Nb in solid solution has a direct impact on the hardenability by reducing the transformation temperature of the austenite [17][18];

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Tensile and impact behaviour of a microalloyed medium carbon steel: Effect of the cooling condition and corresponding microstructure

Cited by 94 publications

References 24 publications

A simple constitutive model for predicting flow stress of medium carbon microalloyed steel during hot deformation

A simple constitutive model for predicting flow stress of medium carbon microalloyed steel during hot deformation

Effect of Tempering Temperature on the Low Temperature Impact Toughness of 42CrMo4-V Steel

Niobium Effect on Base Metal and Heat Affected Zone Microstructure of Girth Welded Joints

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