Groove Design and Microstructure Research of Ultra-Fine Grain Bar Rolling

Li, Xuetong; Cao, Lei; Wang, Minting; Du, Fengshan

doi:10.4236/mnsms.2012.24008

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…Typical microstructures of low-alloy α-P steels. (A) Q345, 52,65 (B) BS 4360 50D, 48 (C) EH36 (NR), 66 (D) S355J2 + N (rolling plane), (E) S355J2 + N, 41 (F) S355 66 50 μm, and (G) EH36 TMCP 56 as the crack propagated in air and the occurrence increased with increase in ΔK. In other words, the tendency for crack branching and rejoining tends to increase with increase in the driving force for crack propagation.…”

Section: F I G U R Ementioning

confidence: 99%

The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region

Igwemezie

2020

Fatigue Fract Eng Mat Struct

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This paper presents a study on the effect of microstructure on the fatigue crack growth (FCG) rate in advanced S355 marine steels in the Paris Region of the da/dN versus ΔK log–log plot. The environments of study were air and seawater (SW), under constant amplitude sinewave fatigue loading. Fundamentally, three phenomena (crack tip diversion, crack front bifurcation and metal crumb formation) were observed to influence the rate of FCG. These phenomena appear to be a function of the material microstructure, environment and crack tip loading conditions. The three factors retarded the crack growth by reducing or redistributing the effective driving force at the main active crack tip. A crack path containing extensively the three phenomena was observed to offer strong resistance to FCG. In SW, the degree of the electrochemical dissolution of the microplastic zone appears to be an additional primary factor influencing FCG in the steels.

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Section: F I G U R Ementioning

confidence: 99%

The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region

Igwemezie

2020

Fatigue Fract Eng Mat Struct

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“…Despite the advantages of the caliber rolling process compared with the wire drawing process, few studies exist on the caliber rolling process at cold and warm rolling temperatures [2][3][4][5][6][7][8][9][10]. Yin et al [3] revealed that a caliber-rolled ferritic steel exhibits a <110> fiber texture at the recrystallization temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, several researchers have focused on caliber rolling to improve the strength-ductility balance, toughness, and fatigue properties of metals, such as medium-carbon steel [11], hypereutectoid steel [12], Zn alloys [13], Mg alloys [14], Ti alloys [15], and composite materials [16,17]. Despite the advantages of the caliber rolling process compared with the wire drawing process, few studies exist on the caliber rolling process at cold and warm rolling temperatures [2][3][4][5][6][7][8][9][10]. Yin et al [3] revealed that a caliber-rolled ferritic steel exhibits a <110> fiber texture at the recrystallization temperature.…”

Section: Introductionmentioning

confidence: 99%

Hardening and Softening Behavior of Caliber-Rolled Wire

Hwang

2022

Materials

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The different behaviors of the mechanical properties of drawn and caliber-rolled wires with applied strain were investigated to determine the appropriate process between wire drawing and caliber rolling with consideration of materials and process conditions. Ferritic, pearlitic, and TWIP steels were drawn and caliber-rolled under the same process conditions. Caliber-rolled wires exhibited a hardening behavior in the early deformation stage and softening behavior in the later deformation stage compared with the drawn wires, regardless of the steel. The hardening behavior of the caliber-rolled wires was explained by the higher strain induced by caliber rolling compared with wire drawing, especially the higher amount of redundant work in caliber-rolled wire. The caliber-rolled wire had approximately 36% higher strain than the drawn wire and approximately 85% higher strain than nominal strain. The softening behavior of the caliber-rolled wire in later deformation stages was related to the Bauschinger effect or low-cycle fatigue effect caused by the roll geometries and loading conditions during caliber rolling. The different intersection points of the tensile strength between drawn and caliber-rolled wires with the steels were attributed to the different strain hardening rates of each steel. Between the options of the caliber rolling and wire drawing processes, the appropriate process should be selected according to the strain hardening rate of the material and the amount of plastic deformation. For instance, when the wires need to deform at high levels, wire drawing is the better process because of the appearance of the Bauschinger effect in caliber-rolled wire.

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“…The modification of the initial preform to be rolled with convex end shapes minimised fish tail in hot rolling [16]. Using a non-linear finite element method a new flat-oval groove with a multi-direction low temperature deformation was proposed for ultra-fine grain development [17]. Using a FEM based simulation on hot deformation of steel prediction of load, torque, temperature distribution, metal flow behaviour, macrostructure, microstructure and austenitic grain size was validated with experimental data [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of pass schedule and groove design on the metal deformation of 38MnVS6 in the initial passes of hot rolling

Nalawade

Marje

Balachandran

et al. 2016

Sadhana

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The deformation behaviour of a hot rolled micro-alloyed steel bar of grade 38MnVS6 was examined using an FEM model during the initial passes in a blooming mill, as a function of three different pass schedules, roll groove depth, collar taper angle and corner radius. The simulations predicted the effective strain penetration, load, torque, fish tail billet end shapes, and metal flow behaviour at a chosen temperature, mill rpm and draft. The model predictions were validated for typical groove geometry and a typical pass schedule. Lower collar taper angle, lower corner radius and higher depth of groove in hot rolling enabled achievement of higher strain penetration, higher mill load and lower fish tail formation. The present study establishes the capability of the model to improve the internal quality of the rolled billet as measured by effective strain which was corroborated to the rolled bar macrostructure and microstructure. The model enables yield improvement by the choice of draft to minimise fish tail losses. The surface quality is improved by the ability to avoid fin formation that occurs at certain conditions of rolling. Thus, the groove geometry, roll pass schedule and rolling mill parameters and temperature can be optimised for best product quality and yield.

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Groove Design and Microstructure Research of Ultra-Fine Grain Bar Rolling

Cited by 5 publications

References 11 publications

The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region

The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region

Hardening and Softening Behavior of Caliber-Rolled Wire

Effect of pass schedule and groove design on the metal deformation of 38MnVS6 in the initial passes of hot rolling

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