scholarly journals Friction Stir Processing of Additively Manufactured Ti-6Al-4V Alloy: Structure Modification and Mechanical Properties

Metals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 55
Author(s):  
Kirill Kalashnikov ◽  
Andrey Chumaevskii ◽  
Tatiana Kalashnikova ◽  
Andrey Cheremnov ◽  
Evgeny Moskvichev ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Friction Stir Processing ◽  
Growth Direction ◽  
Material Strength ◽  
Material Structure ◽  
Strength Increase ◽  
Friction Stir ◽  
Nickel Based Superalloy ◽  
Columnar Grain ◽  
Tensile Strength Increase

This work explores the possibility of using friction stir processing to harden the Ti-6Al-4V titanium alloy material produced by wire-feed electron beam additive manufacturing. For this purpose, thin-walled workpieces of titanium alloy with a height of 30 cm were printed and, after preparation, processed with an FSW-tool made of heat-resistant nickel-based superalloy ZhS6U according to four modes. Studies have shown that the material structure and properties are sensitive to changes in the tool loading force. In contrast, the additive material’s processing direction, relative to the columnar grain growth direction, has no effect. It is shown that increasing the axial load leads to forming a 𝛽-transformed structure and deteriorates the material strength. At the same time, compared to the additive material, the ultimate tensile strength increase during friction stir processing can achieve 34–69%.

Shape memory alloy based NiTi reinforced functionally graded material for vibration damping

2021 ◽  
pp. 146442072110355
Author(s):  
Namrata Gangil ◽  
Arshad Noor Siddiquee ◽  
Sameera Mufazzal ◽  
SM Muzakkir ◽  
Sachin Maheshwari
Keyword(s):  
Titanium Alloy ◽  
Shape Memory ◽  
Functionally Graded Material ◽  
Friction Stir Processing ◽  
Vibration Damping ◽  
Functionally Graded ◽  
Nickel Titanium ◽  
Friction Stir ◽  
Alloy Particles ◽  
Graded Material

Shape memory based high performance nickel-titanium alloy particles were embedded by friction stir processing in graded concentration on the surface of light weight commercially pure magnesium cast plates. The novel functionally graded material so developed was analyzed for microhardness evolution and vibration damping effect. The nickel-titanium alloy particles were filled in a 2.5 wide × 3 mm deep slot and embedded on the surface by friction stir processing. A shallower slot 2.5 wide × 1.5 mm deep was milled over the previously embedded surface in which nickel-titanium alloy powder was again filled and embedded on the surface by second pass friction stir processing. This sequence of pass created the graded variation in nickel-titanium alloy concentration. The so fabricated functionally graded material was cut out from the plate and it was hot-forged to 2/3 thickness and subsequently quenched. The microstructural examination confirmed homogeneous dispersion of nickel-titanium alloy particles and clear interface between high and low concentration regions. The microhardness confirmed a uniform graded variation in hardness. The vibration damping tests confirm considerable improvement in the damping capacity of the fabricated functionally graded material.

Friction Stir Processing Trials of SP-700 (Ti-4.5Al-3V-2Fe-2Mo) Titanium Alloy

2018 ◽  
Vol 385 ◽  
pp. 349-354
Author(s):  
Hamed Mofidi Tabatabaei ◽  
Chiaki Okuyama ◽  
Tadashi Nishihara ◽  
Takahiro Ohashi
Keyword(s):  
Titanium Alloy ◽  
Friction Stir Processing ◽  
Temperature Measurements ◽  
Nominal Composition ◽  
Friction Stir ◽  
Automotive Components ◽  
Beta Alloy ◽  
Fine Microstructure ◽  
Alpha Beta

Superplastic titanium alloy (SP-700 with nominal composition of Ti-4.5Al-3V-2Fe-2Mo) an alpha-beta alloy, with a beta-rich fine microstructure and excellent superplastic formability has wide applications in aerospace components, metal wood heads, tools, automotive components. However, very little information is available regarding friction stir processing (FSP) characteristics of this alloy. This study discusses the trials of FSP of this highly formable titanium alloy. Results are discussed in terms of hardness and temperature measurements and microstructural observations.

Friction stir processing of a metastable β titanium alloy in β and α+β phase fields

2020 ◽  
Vol 772 ◽  
pp. 138705 ◽  
Author(s):  
Shanoob Balachandran ◽  
Rajiv S. Mishra ◽  
Dipankar Banerjee
Keyword(s):  
Titanium Alloy ◽  
Friction Stir Processing ◽  
Friction Stir ◽  
Β Phase ◽  
Phase Fields

scholarly journals Friction Stir Welded AA5052-H32 under Dissimilar Pin Profile and Preheat Temperature: Microstructural Observations and Mechanical Properties

Metals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 4
Author(s):  
Nurul Muhayat ◽  
Mulyadi Sinung Harjono ◽  
Yohanes Pringeten Dilianto Sembiring Depari ◽  
Aditya Rio Prabowo ◽  
Triyono Triyono ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Strength Increase ◽  
Preheat Temperature ◽  
Friction Stir ◽  
Hardness Increase ◽  
And Performance ◽  
Joint Quality ◽  
Tensile Strength Increase ◽  
Tool Pin

In order to meet the escalating demand in the shipbuilding business, suitable materials with enhanced qualities are required to maximize ship cargo while reducing fuel consumption. Aluminum (Al) and its alloys are competing contenders for use in a variety of complicated ship structures. The major challenge to enhancing joint quality and performance is the quest for a viable and efficient FSW parameter. The main focus of this study was to critically explore the effect of the tool pin profile and the preheat temperature used during the friction stir welding of AA 5052-H32 on its mechanical properties and weld microstructure characteristics. There are three pin profile variations, including samples that were cylindrical, samples with two flat sides, and samples with three flat sides, all of which were investigated in different preheat temperatures (150–300 °C). The results that were obtained during macrographic observation showed that tunnel defects were visible in the cylindrical and two-flat-sided pin profile designs. During observations of the microstructure, it was observed that the grain size became finer and smaller in the weld nugget compared to in the heat affected zone (HAZ) and thermo-mechanically affected zone (TMAZ) regions due to dynamic recrystallization. However, at the 300 °C preheat variation, the grain size appeared to be larger due to the slower cooling rate, causing a decrease in the mechanical properties of the samples. The results of the physical tests determined that the preheat temperature caused an increase in the mechanical properties until 250 °C, at which point the three-flat-sided pin profile tool demonstrated superior mechanical properties compared to the tools with a cylindrical design; a 12.2% tensile strength increase, a 15.3% and 9.4% face and root bending increase, and an 11.2% hardness increase were observed.

scholarly journals Fine tuning of dwelling time in friction stir welding for preventing material overheating, weld tensile strength increase and weld nugget size decrease

2016 ◽  
Vol 20 (6) ◽  
pp. 2137-2147 ◽  
Author(s):  
Miroslav Mijajlovic ◽  
Sonja Vidojkovic
Keyword(s):  
Tensile Strength ◽  
Base Material ◽  
Fine Tuning ◽  
Weld Nugget ◽  
Strength Increase ◽  
Destructive Testing ◽  
Dwelling Time ◽  
Friction Stir ◽  
Tensile Strength Increase ◽  
Al 2024

After successful welding, destructive testing into test samples from Al 2024-T351 friction stir butt welds showed that tensile strength of the weld improve along the joint line, while dimensions of the weld nugget decrease. For those welds, both the base material and the welding tool constantly cool down during the welding phase. Obviously, the base material became overheated during the long dwelling phase what made conditions for creation of joints with the reduced mechanical properties. Preserving all process parameters but varying the dwelling time from 5-27 seconds a new set of welding is done to reach maximal achievable tensile strength. An analytical-numerical-experimental model is used for optimising the duration of the dwelling time while searching for the maximal tensile strength of the welds

Analisa Sifat Mekanik dan Struktur Mikro pada Proses Friction Stir Welding Alumunium 5052

2016 ◽  
Vol 10 (2) ◽  
pp. 105-118
Author(s):  
Tarmizi Tarmizi ◽  
Boy Prayoga
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Friction Stir Welding ◽  
Solid State ◽  
Welding Process ◽  
Butt Joint ◽  
Grain Structure ◽  
Strength Increase ◽  
Friction Stir ◽  
Tensile Strength Increase

Friction stir welding (FSW) is solid state joining technique or the metal didn’t melt when joining process. This method is used the characteristic of the parent metal has not change. This process is widely used for materials, especially aluminum heat treatment usually must be done first before welding, FSW method invented by The Welding Institute W.Thomas from the welding institute (TWI). Friction stir welding process is used to alumunium 5052 T-0 to form butt joint as much as nine plate. Parameter which varied is pin design form with form triangle, cylinder and cone with screw. The next testing which includes the observation radiography test, tensile test, hardnest test and metallography examination. The results of the study that the variation of the form triangle screw, cylinder screw and cone screw cause hardness value and tensile strength increase and a decrease to triangle screw. Of variation this thesis hardness and tensile strength was highest in cylinder screw as big as 38.27 HV and 120.442 MPa.The microstructure results weld tool 2 (pin cylinder screw) produce finer grain structure than the tool 1 (cone with screw) and the tool 3 (triangle screw).ABSTRAK Friction stir welding  (FSW) adalah proses penyambungan material dengan kondisi solid state atau logam tidak meleleh saat di lakukan penyambungan. Metoda ini digunakan agar karakteristik dari logam induk tidak banyak berubah.  Proses ini banyak digunakan untuk  material khususnya alumunium yang biasanya harus di heat treatment terlebih dahulu sebelum dilakukan pengelasan, metoda FSW ditemukan oleh W.Thomas dari The Welding Institute (TWI). Proses FSW dilakukan pada alumunium seri 5052 T0 dengan bentuk sambungan tumpul sebanyak 9 pelat. Paramter yang divariasikan adalah design bentuk pin dengan bentuk segitiga ulir, silinder ulir dan kerucut ulir. Selanjutnya dilakukan pengujian yang meliputi pengamatan  uji radiografi, uji tarik, uji kekerasan dan pemeriksaan metalografi. Hasil penelitian bahwa dengan variasi bentuk pin segitiga ulir, silinder ulir dan kerucut ulir menyebabkan nilai kekerasan dan kekuatan tarik meningkat serta terjadi penurunan pada pin segitiga ulir. Hasil kekerasan dan kekuatan tarik tertinggi terdapat pada silinder ulir sebesar 38.27 HV dan 120.442 MPa. Struktur mikro hasil lasan  tool 2 (pin silinder ulir) menghasilkan struktur butir yang lebih halus dibandingkan dengan tool 1 (kerucut ulir) dan tool 3 (segitiga ulir).Kata kunci: silinder ulir, segitiga ulir, kerucut ulir 

Microstructure Modification of 3D Printed Aluminium Alloys by Friction Stir Processing

2021 ◽  
Vol 1016 ◽  
pp. 1460-1465
Author(s):  
Zheng Lin Du ◽  
Ming Jen Tan ◽  
Jun Feng Guo
Keyword(s):  
Friction Stir Processing ◽  
Micro Hardness ◽  
Friction Stir ◽  
Microstructure Modification ◽  
Melt Pool ◽  
Welding Technology ◽  
3D Printed ◽  
Columnar Grain ◽  
Equiaxed Grains ◽  
Microstructure Of The Material

Friction stir processing is a solid-state welding technology capable of joining metal parts without the melting. The microstructure of the material evolved during the process vary from columnar grain along the thermal gradient in the melt pool to fine equiaxed grains. Evaluation on its mechanical properties in terms of micro-hardness was performed. A significant decrease in microhardness was observed in the processed region. The decrease in the microhardness is mainly attributed to the dissolution of hardening precipitates in the aluminium matrix.

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