Similar and dissimilar welds of ultrafine grained aluminium obtained by friction stir welding

Orłowska, Marta; Brynk, Tomasz; Hütter, Andreas; Goliński, J.; Enzinger, Norbert; Olejnik, Lech; Lewandowska, M.

doi:10.1016/j.msea.2020.139076

Cited by 26 publications

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References 50 publications

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“…[11] Our previous works investigated the effectiveness of FSW for UFG Al. [12,13] In both studies, due to the continuous dynamic recrystallization in the stir zone (SZ), the average grain size increased from about 1 lm to 3-6 lm, which caused a decrease in microhardness to about 30-32 HV0.2, which is similar to the results of this study, despite the much larger grain size in the FZ. The reason for this may lie in certain processes that take place during EBW.…”

supporting

confidence: 84%

Application of Electron Beam Welding Technique for Joining Ultrafine-Grained Aluminum Plates

Orłowska

Pixner

Majchrowicz

et al. 2021

Metall Mater Trans A

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The present study is the first attempt to join ultrafine-grained materials by electron beam welding. The aim of the study was to check the feasibility and effectiveness of this type of welding for thermally unstable materials. The results obtained are of high interest, while the welding did cause a decline in mechanical properties, the results were comparable to those obtained using solid-state welding, but with a significant advantage of narrower fusion- and heat-affected zones.

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supporting

confidence: 84%

Application of Electron Beam Welding Technique for Joining Ultrafine-Grained Aluminum Plates

Orłowska

Pixner

Majchrowicz

et al. 2021

Metall Mater Trans A

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“…For all tested zones of the friction-welded joint, in the misorientation angles distributions there is a high peak for the angle of 3° ( Figure 10 ), which is typical for the material after SPD treatment [ 42 ]. However, the misorientation angle size for all of them is of the high angle type (above 15°).…”

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confidence: 99%

Microstructural Investigation of a Friction-Welded 316L Stainless Steel with Ultrafine-Grained Structure Obtained by Hydrostatic Extrusion

et al. 2021

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The paper presents the microstructural investigation of a friction-welded joint made of 316L stainless steel with an ultrafine-grained structure obtained by hydrostatic extrusion (HE). Such a plastically deformed material is characterized by a metastable state of energy equilibrium, increasing, among others, its sensitivity to high temperatures. This feature makes it difficult to weld ultra-fine-grained metals without losing their high mechanical properties. The use of high-speed friction welding and a friction time of <1 s reduced the scale of the weakening of the friction joint in relation to result obtained in conventional rotary friction welding. The study of changes in the microstructure of individual zones of the friction joint was carried out on an optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and electron backscattered diffraction (EBSD) analysis system. The correlation between the microstructure and hardness of the friction joint is also presented. The heat released during the high-speed friction welding initiated the process of dynamic recrystallization (DRX) of single grains in the heat-affected zone (HAZ). The additional occurrence of strong plastic deformations (in HAZ) during flash formation and internal friction (in the friction weld and high-temperature HAZ) contributed to the formation of a highly deformed microstructure with numerous sub-grains. The zones with a microstructure other than the base material were characterized by lower hardness. Due to the complexity of the microstructure and its multifactorial impact on the properties of the friction-welded joint, strength should be the criterion for assessing the properties of the joint.

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“…It was noted that the morphology of 1P AA1050/AA6082 and the morphology of 4P AA1050/AA6082 were characterized by dimples and micro voids. The presence of dimples along with the micro voids is an indication of ductile failure mode[34][35][36]. Fig.9(c)-(f) and Fig.10 (c) and (f) were characterized by the presence of riverlike fractured surfaces.…”

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The effect of material position of multi-pass friction stir processing on friction stir welded AA1050/AA6082 dissimilar joints

et al. 2021

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The AA1050 and AA6082 plates were used in producing dissimilar joint through friction stir welding (FSW) technique. The developed dissimilar joint was then subjected to multi-pass friction stir processing (FSP) technique. Various tests for the AA1050/AA6082 (AA1050 on the advancing side) and AA6082/AA1050 (AA6082 on the advancing side) joints were conducted on joints subjected to 1pass (1P) and 4pass (4P). The microstructural analysis showed that the increase in number of FSP passes resulted in a reduced grain size regardless of the of material position. The Vickers microhardness for AA1050/AA6082 FSPed joints increased towards AA6082 side while the microhardness for AA6082/AA1050 FSPed joints decreased towards the AA 1050 side regardless the number of the passes. The ultimate tensile strength (UTS) of AA1050/AA6082 joint increased with an increase in the number of passes while AA6082/AA1050 fluctuated between the specimens sampled from different locations of the FSPed joints.

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Similar and dissimilar welds of ultrafine grained aluminium obtained by friction stir welding

Cited by 26 publications

References 50 publications

Application of Electron Beam Welding Technique for Joining Ultrafine-Grained Aluminum Plates

Application of Electron Beam Welding Technique for Joining Ultrafine-Grained Aluminum Plates

Microstructural Investigation of a Friction-Welded 316L Stainless Steel with Ultrafine-Grained Structure Obtained by Hydrostatic Extrusion

The effect of material position of multi-pass friction stir processing on friction stir welded AA1050/AA6082 dissimilar joints

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