Microstructure and Mechanics Interaction in the Modeling of Hot Rolling of Rods

Pauskar, Praveen; Shivpuri, Rajiv

doi:10.1016/s0007-8506(07)63163-1

Cited by 20 publications

(10 citation statements)

References 3 publications

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“…For desirable goals to be achieved, careful handling is required to ensure proper property changes of steel during deformation at varied loads, temperature and composition. Roll-pass design is also known to have a significant effect on the flow stress of the metal [22]. The design that accomplishes rolling of bars within limited number of passes is usually considered [23].…”

Section: Rolling Process Dysfunctionmentioning

confidence: 99%

Challenges of Producing Quality Construction Steel Bars in West Africa:Case Study of Nigeria Steel Industry

Balogun¹,

Esezobor²,

Adeosun³

et al. 2009

JMMCE

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The production of quality high-yield reinforcing steel bars continues to receive attention from researchers across the globe due to its importance and contribution to a country GDP. In most of the developing countries, particularly Nigeria, empirical studies have shown that bars produced through conventional rolling requires appropriate modification of its chemical composition in order to obtain the desired mechanical properties such as strength. However, the high cost factor involved in composition adjustment makes such approach unattractive. Rather, the application of the combination of systems of controlled rolling and controlled cooling proves to be the best option. This system however, requires some variations in processing parameters to suit individual plant production peculiarities. In this paper attempt is made to study the production challenges and opportunities the steel millers are facing in Nigeria. Previous works in this area are also reviewed with a view to charting the way forward. Experimental studies and process monitoring were carried out at some designated rolling mills in Nigeria.

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Section: Rolling Process Dysfunctionmentioning

confidence: 99%

Challenges of Producing Quality Construction Steel Bars in West Africa:Case Study of Nigeria Steel Industry

Balogun¹,

Esezobor²,

Adeosun³

et al. 2009

JMMCE

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“…Constitutive laws implemented in the models of metal forming processes are used to relate the process parameters to the material flow stress [169], to the evolution of microstructural features and phenomena, such as the grain size [160], phase transformations [48,117], precipitation kinetics [50], and to the damage evolution [231], which, in turn, provide the basis for the prediction of the mechanical properties in the product, such as yield strength and ductility, fatigue and fracture resistance. When processing under cold conditions, the modeling of material texture assumes importance, especially in case of sheet forming processes [34].…”

Section: Mechanical and Microstructural Predictions During Processingmentioning

confidence: 99%

“…These models are implemented into the process models to predict the evolution of the microstructural state and, possibly, the mechanical properties in the product, both off-line and in-line, e.g., in hot rolling of rods and strips [160,166]. They have two main drawbacks: first, their material parameters have to be determined empirically, and second the form of the regression fit may not capture the possible changes in the underlying microstructural phenomena.…”

Section: Mechanical and Microstructural Predictions During Processingmentioning

confidence: 99%

Metal forming beyond shaping: Predicting and setting product properties

et al. 2015

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“…Karhausen, et al [39], provide a comprehensive procedure in implementing the mi- time. This procedure is similar to the procedure mentioned in Reference [41]. The procedure developed by Thomas, et al [61] is more comprehensive instead and has been validated for Alloy 718 which undergoes more complex microstructural processes when compared with those of the steel material considered in [41].…”

Section: Empirical Modelingmentioning

confidence: 99%

Microstructural Modeling During Multi-Pass Rolling of a Nickel-Base Superalloy

Subramanian

Cherukuri

2009

Volume 11: Mechanics of Solids, Structures and Fluids

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Superalloys are metallic alloys used for high temperature applications such as encountered in the aircraft industry and where resistance to deformation is a primary requirement. Alloy 718 is one such Nickel-base superalloy that resists deformation at elevated temperatures and is therefore difficult to hot work. One of the major hotworking operations is multi-pass shape rolling in which Alloy 718 undergoes multiple deformations in several passes along with reheating between passes. For a given composition of alloy, the high temperature flow stress is influenced to a large extent by the grain size of the microstructure. In the case of shape rolling in which the cross section changes from circular to oval in alternate passes, the correct working forces, which relate to gauge and shape control as well as to power requirements, can be estimated accurately only if the microstructure relevant to the specific pass of rolling is known. In addition, the microstructure present at the end of the rolling and cooling operations controls the product properties. Control of grain size is an increasingly important characteristic in hotworking. The narrow temperature range (980°C and 1120°C [1]) for hotworking of Alloy 718 makes the grain size control more difficult. During hotworking, Alloy 718 undergoes microscopic and mesoscopic events such as dynamic recrystallization (DRX), metadynamic recrystallization (MDRX) and static grain growth (SGG) depending on the temperature, strain rate and retained strain. Modeling these microstructural events is important in designing the rolling process. Due to the tremendous amount of time, cost and effort associated with experiments and industrial trials, numerical methods are resorted to because of the complexity of the variables involved in multi-pass rolling. One such popular numerical technique, finite element (FE) method can predict process variables such as strain, strain rate and temperature for the deformation process. In general, microstructural modeling relates these process variables to microstructural evolution. During microstructural modeling, constitutive equations describing the microstructural evolutions are developed using experiments, which can then be readily implemented in an FE package capable of modeling rolling processes.

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Microstructure and Mechanics Interaction in the Modeling of Hot Rolling of Rods

Cited by 20 publications

References 3 publications

Challenges of Producing Quality Construction Steel Bars in West Africa:Case Study of Nigeria Steel Industry

Challenges of Producing Quality Construction Steel Bars in West Africa:Case Study of Nigeria Steel Industry

Metal forming beyond shaping: Predicting and setting product properties

Microstructural Modeling During Multi-Pass Rolling of a Nickel-Base Superalloy

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