Continuous ECAP process design for manufacturing a microstructure-refined bolt

Jin, Young Ho; Baek, Hyun Moo; Im, Yong‐Taek; Jeon, Byung Cheol

doi:10.1016/j.msea.2011.09.113

Cited by 23 publications

(8 citation statements)

References 17 publications

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“…ECAP method was introduced by Segal in the early 1980s. The material deformation of the material in ECAP isinfluenced by the non-linearity of the metals, temperature, moldgeometry, ram speed, friction between specimen and die, and plungersshape [8][9][10]. The FCGR (Fatigue Crack Growth Rate) was also investigated for as-received and ECAPed specimens.…”

Section: Augmentation Of Fatigue and Tensile Strength Of Aa-6061procementioning

confidence: 99%

Augmentation of Fatigue and Tensile Strength of AA-6061 Processed through Equal Channel Angular Pressing

Anjum

Mehmood

Anwar

et al. 2019

Mehran Univ. res. j. eng. technol.

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ECAP (Equal Channel Angular Pressing) is a technique used to enhance the strength of material by grain refinement. In this research, an aerospace grade aluminum alloy-6061 is investigated. The specimens were pressed through ECAP die channels, intersecting each other at an angle of 90oC where a shear plane of 45oC was developed, that results grains refinement. Fatigue strengths and CGR (Crack Growth Rate) for the stress ratio R 0.7 and 0.1 are found and compared with the as-received material.It was observed that the CGR is slower at stress ratio R=0.1, as compared to stress ration R=0.7. An electric furnace was embedded with ECAP die to regulate the material flow through this die. The temperature of the die was maintained at 450oC during ECAP pressing and the specimens were also preheated at this temperature using another furnace. The ECAP die consists of two channels intersecting at 90o provided with safe inner and outer corner radius to avoid scaling.The microstructural observations revealed that the deformation was perfectly plastic. The ECAPed and as-received materials were also characterized by tensile tests, micro-hardness tests, and 3-point bend fatigue tests.

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Section: Augmentation Of Fatigue and Tensile Strength Of Aa-6061procementioning

confidence: 99%

Augmentation of Fatigue and Tensile Strength of AA-6061 Processed through Equal Channel Angular Pressing

Anjum

Mehmood

Anwar

et al. 2019

Mehran Univ. res. j. eng. technol.

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“…by increasing the number of passes. Hockauf et al 7) developed an A6056 alloy material with ³450 MPa in UTS by combined application of ECAP 2pass and aging treatment at 473 K. Jin et al 8,9) also succeeded in producing high-strength bolts of A6061-T6 alloy with >460 MPa in UTS by means of a newly developed and continuously repeatable spring-loaded ECAP. Therefore, it seems that the development of bolt materials with >500 MPa in UTS will be possible if both of ECAP and aging treatments are appropriately applied to AlMgSi alloys.…”

Section: Introductionmentioning

confidence: 99%

Development of High-Strength Bolt Material of Al–Mg–Si Alloy by ECAP and Various Aging Treatments

et al. 2019

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At present, the strength of most of AlMgSi alloy bolts is not enough, and thus highly expected to be increased, for example, to >500 MPa in ultimate tensile strength (UTS). In this study, mechanical strength of A6056 AlMgSi alloy was aimed at improving, without diminishing the elongation, by combined application of equal-channel angular pressing (ECAP) and various aging treatments. Multi-pass ECAP and pre-aging (PA) treatment at 373 K for 1.2 ks was found to be effective in strengthening the bolt material subject to room-temperature storage followed by artificial aging. Especially, PA plus ECAP 2pass treatment exerted the biggest impact on the strength (i.e. 514 MPa in UTS) with a reasonable elongation to fracture (i.e. 16%). Such a high strength and good ductility exceeds minimum requirement for aluminum-made bolts registered in JIS B1057, and thus the developed PA-ECAP 2pass specimen can be utilized potentially as a high-strength bolt material.

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“…The principle of the extruded material through a die consists of two perpendicular channels. The material is in the transition of shear without changing of it is cross-sectional [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Influence of Heat Treatment on Properties of en Aw 6082 Aluminium Alloy

Lacková¹,

Buršák²,

Milkovič³

et al. 2015

Acta Metall Slovaca

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The main aim of this work is to point out on possibility of properties improving of the aluminium alloy EN AW 6082 (AlSi1MgMn) with an appropriate combination of pre-ECAP solution annealing, the application of the severe plastic deformation by ECAP technology (equal channel angular pressing) and post-ECAP artificial aging. The effect of the severe plastic deformation and artificial aging on the alloy structure was evaluated by metallographic analysis, and alloy mechanical properties by uniaxial tensile test at room temperature, the Vickers hardness and by tribology test of resistance to abrasive wear. As a result of strain hardening by severe plastic deformation it reaches the improvement in hardness (by 56%), strength characteristics (yield strength by 92%, tensile strength by 29%) and abrasion wear resistance is 28 %. Keywords: severe plastic deformation, tension test, aluminium alloys, wear IntroductionThe aluminium alloys belonging to 6XXX groups, which are widely used in structural applications, the construction industry, the automotive industry and architectural section as extrusions products [1]. AlSi1MgMn alloy is characterized by good mechanical properties, resistance to tribology (abrasion wear) and corrosion degradation, low density. Due to good tribological properties of alloy can be used in excellent application. These properties can be increased by strengthening mechanisms: alloying additives respectively heat treatment and the severe plastic deformation [2][3]. The AlSi1MgMn alloy is alloyed from the main elements namely magnesium and silicon. At higher magnesium content tends to increase strength properties of hardened alloy formation of Mg 2 Si phase. Silicon improves mechanical properties by changing the shape of the grain. Except of the main alloying elements, there are added the alloy chromium and manganese which form dispersion particles. These are larger than the other precipitates that can act as nucleation sites for strengthening precipitations, and have good thermal stability, which influences the recovery and recrystallization [4][5][6] Another way of improving the properties of the alloy is heat treatment (consisting of solution treatment, quenching in water, and a natural or artificial ageing treatment). From the

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Continuous ECAP process design for manufacturing a microstructure-refined bolt

Cited by 23 publications

References 17 publications

Augmentation of Fatigue and Tensile Strength of AA-6061 Processed through Equal Channel Angular Pressing

Augmentation of Fatigue and Tensile Strength of AA-6061 Processed through Equal Channel Angular Pressing

Development of High-Strength Bolt Material of Al–Mg–Si Alloy by ECAP and Various Aging Treatments

Influence of Heat Treatment on Properties of en Aw 6082 Aluminium Alloy

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