Experimental investigation and simulation of structure and tensile properties of Tempcore treated rebar

Khalifa, Hany; Megahed, G. M.; Hamouda, Rawia M.; Taha, M. A.

doi:10.1016/j.jmatprotec.2015.11.023

Cited by 20 publications

(12 citation statements)

References 9 publications

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“…It is imperative to mention here that in the TMT process, quenching of hot-rolled bars with water jet leads to the formation of martensite at the outer surface of the rebars. The residual heat flow across their bar section during cooling results in the tempering of the initially formed martensite with finer grains, which is self-tempering in nature and also produces ferrite-pearlite with coarser grains or mixed microstructure in the core region [13,33,41,42]. A clear boundary separating the outer ring from the inner core is also visible in the case of TMT rebars (Figures 1(a) and (b)).…”

Section: Optical Micrographsmentioning

confidence: 92%

Study on the Perspective of Mechanical Properties and Corrosion Behaviour of Stainless Steel, Plain and TMT Rebars

Dey¹,

Manna²,

Yadav³

et al. 2022

Stainless Steels

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In the present research, the effects of various alloying elements and microstructural constituents on the mechanical properties and corrosion behaviour have been studied for four different rebars. The microstructures of stainless steel and plain rebar primarily reveal equiaxed ferrite grains and ferrite-pearlite microstructures, respectively, with no evidence of transition zone, whereas tempered martensite at the outer rim, followed by a narrow bainitic transition zone with an internal core of ferrite-pearlite, has been observed for the thermomechanically treated (TMT) rebars. The hardness profiles obtained from this study display maximum hardness at the periphery, which decreases gradually towards the centre, thereby providing the classical U-shaped hardness profile for TMT rebars. The tensile test results confirm that stainless steel rebar exhibits the highest combination of strength (≈755 MPa) and ductility (≈27%). It has been witnessed that in Tafel plots, the corrosion rate increases for all the experimental rebars in 1% HCl solution, which is well expected because the acid solutions generally possess a higher corrosive environment than seawater (3.5% NaCl) due to their acidic nature and lower pH values. However, all the experimental results obtained from Tafel and Nyquist plots correlate well for both 1% HCl and 3.5% NaCl solutions.

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Section: Optical Micrographsmentioning

confidence: 92%

Study on the Perspective of Mechanical Properties and Corrosion Behaviour of Stainless Steel, Plain and TMT Rebars

Dey¹,

Manna²,

Yadav³

et al. 2022

Stainless Steels

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“…These results show that the need to relate the microstructures to the resulting properties of quenched and tempered rebar can be satisfied by proposed TPS. Khalifa et al [31] developed a thermal model to predict the temperature distribution across the bar over its whole quenching and self-tempering rout. The output of this model has been used to calculate the area of martensite formed in outer layer and ferrite-pearlite zone.…”

Section: Performance Validation Of Tpsmentioning

confidence: 99%

“…The mechanical properties of Tempcore rebar have been the subject of several studies. The impact toughness [26], fatigue behavior [27], weldability for seismic application [28], and behavior at elevated temperature [29][30][31] have been studied. Nevertheless, data on practical experimental simulation is very scarce even though this is a very important factor to save time and cost.…”

Section: Introductionmentioning

confidence: 99%

Tempcore Process Simulator to Analyze Microstructural Evolution of Quenched and Tempered Rebar

Park

Kim

et al. 2019

Applied Sciences

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Tempcore process simulator (TPS) has been developed in this study to analyze the microstructural evolution of quenched and tempered rebar. There has been an increasing need to relate the complex microstructures to the resulting properties of quenched and tempered rebar. However, information on such relationships typically requires precise thermal histories imposed on the workpiece. Therefore, TPS, capable of simulating the Tempcore process, has been developed to produce high-fidelity data. TPS mainly consists of a vacuum induction furnace, pilot rolling mill, box furnace, and cooling unit to simulate shop floor operations. A series of experimental tests were successfully carried out with various parameters, such as reheating temperature, water flow, water pressure, and cooling time. The effects of chemical compositions and cooling time on the microstructural evolution and mechanical properties of quenched and tempered rebar have been analyzed to validate the performance of TPS. The results show that TPS can simulate the Tempcore process with a high degree of fidelity and reliability.

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“…Dual phase steel is the most encouraging advanced high-strength steel class in accomplishing high strength, high ductility with low weight [3]. Dual phase steel, as its name proposes, has two main phases, ferrite and martensite [4]. The ductility and strength of dual phase steel is provided by the ferrite and martensite phases respectively [5].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of flow behaviour, grain size prediction and experimental verification of hot rolled ultralow carbon niobium microalloyed steel

Khalifa

Megahed

El-Bitar

et al. 2021

Materialwissenschaft Werkst

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Niobium bearing ultralow carbon micro alloyed dual phase steel grade steel with chemical composition of 0.045 wt.% carbon, 0.04 wt.% niobium, 0.59 wt.% chromium, 0.9 wt.% manganese, 0.28 wt.% silicon is investigated. The design of thermomechanical treatment needs knowledge about the flow behaviour at high deformation temperatures, to be used for this steel in industrial plants. Therefore, this work aims to predict, for the investigated steel, the flow behaviour and mean flow stress. A phenomenological constitutive model is established to derive the flow stress using the hyperbolic sinusoidal Arrhenius mathematical model. The relation between stress and strain with Zener‐Hollomon parameter is studied. Mean flow stress has been figured out by measurements taken from compact slab production plant log data using a constitutive model. The constitutive model is further verified by multiple hits of flat compression setup mode at BährTTS820 physical simulator. The tests were performed under specific thermochemical schedule simulating compact slab production plant. The results show good agreement between the calculated flow stress, Non‐recrystallization temperature and experimentally measured values obtained from the physical simulation. Ferrite grain size is modelled and predicted then validated by experimental rolled specimens in a practical hot strip mill.

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Experimental investigation and simulation of structure and tensile properties of Tempcore treated rebar

Cited by 20 publications

References 9 publications

Study on the Perspective of Mechanical Properties and Corrosion Behaviour of Stainless Steel, Plain and TMT Rebars

Study on the Perspective of Mechanical Properties and Corrosion Behaviour of Stainless Steel, Plain and TMT Rebars

Tempcore Process Simulator to Analyze Microstructural Evolution of Quenched and Tempered Rebar

Numerical analysis of flow behaviour, grain size prediction and experimental verification of hot rolled ultralow carbon niobium microalloyed steel

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