Mechanical Properties Analysis of an Al-Mg Alloy Connecting Rod with Submicrometric Structure

León, J.; Salcedo, Daniel; Murillo, Óscar; Luis, C.J.; Fuertes, J.P.; Puertas, I.; Luri, R.

doi:10.3390/met5031397

Cited by 7 publications

(5 citation statements)

References 29 publications

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“…This means that the work-hardening rate reduces with the strain increase. However, the observed strength improvement, which was lower than that with the ECAP method [23,24], was achieved at the expense of ductility, which decreased from 30.1% to about 13.2% after the first DRECE pass; then with an increase in strain accumulation, it decreased to 8.4% after the six DRECE passes. Such changes in strength and ductility are typical for severely deformed metals, as proved in numerous research papers [4,16,25,26].…”

Section: Evolution Of Microstructurementioning

confidence: 99%

Strengthening of AA5754 Aluminum Alloy by DRECE Process Followed by Annealing Response Investigation

et al. 2020

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In this study, a dual rolls equal channel extrusion (DRECE) process has been applied for improving the mechanical properties of the 5754 alloy. Supplementary experiments involving metallography, electron backscattered diffraction (EBSD), and XRD tests were carried out to evaluate the effect of the DRECE process. XRD analysis showed that the maximum dislocation density was achieved after six DRECE passes, which were accompanied by the formation that is typical for low-strain structures. The increasing dislocation density, as well as grain refinement throughout DRECE deformation, resulted in an increase in the mechanical properties. Annealing of the as-deformed sample resulted in grain growth and strength reduction.

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Section: Evolution Of Microstructurementioning

confidence: 99%

Strengthening of AA5754 Aluminum Alloy by DRECE Process Followed by Annealing Response Investigation

et al. 2020

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“…In the case of the ECAP-processed and subsequently forged AA-5083, an increase from 107.5 to 118.6 HV (that is, of 10.3%) was obtained in the microhardness mean value [35]. Similarly, in the case of AA-5754, the increase was from 89.1 to 100.0 HV (that is, of 12.2%) [36]. First, billets of AA-5083 and AA-5754 with 20 mm in diameter and 100 mm in length were ECAP-processed twice at room temperature using route C, where this route consisted of rotating the material billet 180 after each passage.…”

Section: Experimental Set-upmentioning

confidence: 88%

“…In the case of the ECAP-processed and subsequently forged AA-5083, an increase from 107.5 to 118.6 HV (that is, of 10.3%) was obtained in the microhardness mean value [35]. Similarly, in the case of AA-5754, the increase was from 89.1 to 100.0 HV (that is, of 12.2%) [36]. Finally, the forged material was again machined in order to obtain the test disks.…”

Section: Experimental Set-upmentioning

confidence: 88%

Analysis of Tribological Properties in Disks of AA-5754 and AA-5083 Aluminium Alloys Previously Processed by Equal Channel Angular Pressing and Isothermally Forged

Pérez

Irigoyen

Puertas

et al. 2020

Metals

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In the present study, the wear behaviour of two aluminium alloys (AA-5754 and AA-5083) is analysed where these have been previously processed by severe plastic deformation (SPD) with equal channel angular pressing (ECAP). In order to achieve the objectives of this study, several disks made of these alloys are manufactured by isothermal forging from different initial states. The microstructures of the initial materials analysed in this study have different accumulated deformation levels. In order to compare the properties of the nanostructured materials with those which have not been ECAP-processed, several disks with a height of 6 mm and a diameter of 35 mm are manufactured from both aluminium alloys (that is, AA-5754 and AA-5083) isothermally forged at temperatures of 150 and 200 °C, respectively. These thus-manufactured disks are tested under a load of 0.6 kN, which is equivalent to a stress mean value of 18 MPa, and at a rotational speed of 200 rpm. In order to determine the wear values, the disks are weighed at the beginning, at 10,000 revolutions, at 50,000 revolutions and at 100,000 revolutions, and then the volume-loss values are calculated. This study was carried out using specific equipment, which may be considered to have a block-on-ring configuration, developed for testing in-service wear behaviour of mechanical components. From this, the wear coefficients for the two materials at different initial states are obtained. In addition, a comparison is made between the behaviour of the previously ECAP-processed aluminium alloys and those that are non-ECAP-processed. A methodology is proposed to determine wear coefficients for the aluminium alloys under consideration, which may be used to predict the wear behaviour. It is demonstrated that AA-5754 and AA-5083 aluminium alloys improve wear behaviour after the ECAP process compared to that obtained in non-ECAP-processed materials.

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“…Some previous studies have been focused on the failures of rods, which in turn caused engine catastrophic failures; regarding this point, a large collection of failures involving connecting rods (con-rods) is, for instance, provided in [1]. A detailed analysis of con-rod states of load and stress is delivered in [2], whereas, again with reference to this component, focus is placed on static and dynamic material properties in [3][4][5]. The primary reasons for rod breakage were mainly related to fatigue cycling that triggered crack initiation in zones with too high stress concentrations owing to poor design [6].…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Connecting Rod High Strength Screws Improved by Surface Peening Treatments

Croccolo

Agostinis

Fini

et al. 2020

Metals

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Bolted joints are highly loaded components and serious issues may arise from improper fastening and in particular from too high or too low preload. Friction at the underhead plays an important role, as it significantly affects the achievable preload for fixed and controlled tightening torque. In addition, multiple tightening is usually performed on connecting rod screws, which may be a further source of friction increment. This study investigates the effect of two surface treatments, shot-peening and deep-rolling, on the tribological properties upon bolt fastening. This topic was tackled experimentally and the campaign involved MJ9 X 1 4 g grade 13.9 36 NiCrMo connecting rod screws, in both lubricated and dry conditions. The results, processed by statistical tools, indicate that deep-rolling does not affect friction, whereas shot-peening yields significant benefits. As an effect of the generation of dimples and multiple contacts, it is able to lower (up to 25%) the bearing frictional coefficient in lubricated conditions, also making the friction level independent of the number of re-tightenings. For a dry surface, an even higher friction decrease (up to 30%) is achieved. Without lubrication, the friction coefficient keeps increasing for the incremented number of tightenings, but the increase rate is lowered with respect to the untreated surface.

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Mechanical Properties Analysis of an Al-Mg Alloy Connecting Rod with Submicrometric Structure

Cited by 7 publications

References 29 publications

Strengthening of AA5754 Aluminum Alloy by DRECE Process Followed by Annealing Response Investigation

Strengthening of AA5754 Aluminum Alloy by DRECE Process Followed by Annealing Response Investigation

Analysis of Tribological Properties in Disks of AA-5754 and AA-5083 Aluminium Alloys Previously Processed by Equal Channel Angular Pressing and Isothermally Forged

Tribological Properties of Connecting Rod High Strength Screws Improved by Surface Peening Treatments

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