scholarly journals Effect of Post Heat Treatment on the Microstructure and Microhardness of Friction Stir Processed NiAl Bronze (NAB) Alloy

Metals ◽  
2015 ◽  
Vol 5 (3) ◽  
pp. 1695-1703 ◽  
Author(s):  
Yuting Lv ◽  
Liqiang Wang ◽  
Xiaoyan Xu ◽  
Weijie Lu
Keyword(s):  
Heat Treatment ◽  
Post Heat Treatment ◽  
Friction Stir

scholarly journals Effect of Pre/Post Heat Treatment on the Friction Stir Welded SSM 356 Aluminum Alloys

2012 ◽  
Vol 32 ◽  
pp. 1139-1146 ◽  
Author(s):  
W. Boonchouytan ◽  
T. Ratanawilai ◽  
P. Muangjunburee
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloys ◽  
Post Heat Treatment ◽  
Friction Stir

Effect of post-heat treatment on the fatigue behaviour of a friction stir spot-welded Al–Mg–Si alloy

2009 ◽  
Vol 23 (7) ◽  
pp. 481-489 ◽  
Author(s):  
Yoshihiko Uematsu ◽  
Keiro Tokaji ◽  
Yasunari Tozaki ◽  
Tatsuo Kurita ◽  
Shunsuke Murata
Keyword(s):  
Heat Treatment ◽  
Fatigue Behaviour ◽  
Post Heat Treatment ◽  
Friction Stir ◽  
Spot Welded

scholarly journals The Influence of Pre- and Post-Heat Treatment on Mechanical Properties and Microstructures in Friction Stir Welding of Dissimilar Age-Hardenable Aluminum Alloys

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1162 ◽  
Author(s):  
Yang Jia ◽  
Sicong Lin ◽  
Jizi Liu ◽  
Yonggui Qin ◽  
Kehong Wang
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Friction Stir Welding ◽  
Weld Joint ◽  
Direct Result ◽  
Composition Analysis ◽  
Number Density ◽  
Post Heat Treatment ◽  
Friction Stir ◽  
Alloy 6061

An Al-Mg-Si alloy 6061 and an Al-Zn-Mg alloy 7A52 were joined by friction stir welding successfully. Pre- and post- heat treatment were employed to improve the strength of the weld. The results show a best weld joint with the lowest hardness of 100 HV in 6061 matrix, being achieved by post-solid-solution and subsequent two-stage artificial aging for the whole weld joint of the 7A52 and 6061 solid solution. Under this condition, the weld nugget zone (WNZ) is stronger than 6061 matrix but it has lower hardness than 7A52 matrix. The hardness of WNZ is contributed by the combination of η′ and L precipitates, dynamically changes along with the ratios between the number of η′ and L precipitates. The higher the number density of η′ precipitates, the hardness of WNZ is closer to that of the 7A52 matrix. Otherwise, the higher number density of L precipitates, the hardness of WNZ is closer to that of 6061 matrix. The coexistence of η′ and L precipitates is a direct result from the mixture of 7A52 and 6061 alloys achieved by stirring. Precipitates identification and composition analysis reveal a dynamic WNZ with constituent transition in hardness and composition.

Precipitates formation and its impact in friction stir welded and post-heat-treated Inconel 718 alloy

2011 ◽  
Vol 1363 ◽  
Author(s):  
Kuk Hyun Song ◽  
Han Sol Kim ◽  
Won Yong Kim
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Grain Size ◽  
Inconel 718 ◽  
Rotation Speed ◽  
Base Material ◽  
Post Heat Treatment ◽  
Inconel 718 Alloy ◽  
Friction Stir ◽  
Heat Treated

ABSTRACTIn order to investigate the formation of precipitates such as MC carbides and intermetallic compounds in the friction stir welded and post-heat-treated Inconel 718 alloy, this work was carried out. Furthermore, the microstructural and mechanical properties of welds and post-heat-treated material were evaluated to identify the effect on precipitates formed during post-heat-treatment. Friction stir welding (FSW) was performed at a rotation speed of 200 rpm and welding speed of 150 mm/min; heat treatment was performed after welding at 720 °C for 8 hours in vacuum. As a result, the grain size due to FSW was notably refined from 5–20 μm in the base material to 1–3 μm in the stir zone; this was accompanied by dynamic recrystallization, which resulted in enhancements in the mechanical properties as compared to the base material. In particular, applying heat treatment after FSW led to improvements in the mechanical properties of the welds—the microhardness and tensile strength increased by more than 50% and 40% in fraction, respectively, as compared to FSW alone.

scholarly journals Effect of Post Heat Treatment on Fatigue Behaviour of Friction Stir Spot Welded Al-Mg-Si Alloy

2008 ◽  
Vol 26 (1) ◽  
pp. 7-14 ◽  
Author(s):  
Yoshihiko UEMATSU ◽  
Keiro TOKAJI ◽  
Yasunari TOZAKI ◽  
Tatsuo KURITA ◽  
Shunsuke MURATA
Keyword(s):  
Heat Treatment ◽  
Fatigue Behaviour ◽  
Post Heat Treatment ◽  
Friction Stir ◽  
Spot Welded

Effect of Pre/Post Heat Treatment on the Friction Stir Welded SSM 356 Aluminum Alloys

2012 ◽  
Vol 488-489 ◽  
pp. 328-334 ◽  
Author(s):  
Worapong Boonchouytan ◽  
Thanate Ratanawilai ◽  
Prapas Muangjunburee
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Welding Speed ◽  
Treatment Condition ◽  
Welding Process ◽  
Heat Treatment Condition ◽  
Post Heat Treatment ◽  
Rotating Speed ◽  
Friction Stir ◽  
Tool Pin

The butt joints of semi solid 356 were produced in as cast conditions by friction stir welding process (FSW). This experiment studied in pre/post heat treatment (T6) using the welding speed 160 mm / min with tilt angle tool at 3 degree and straight cylindrical tool pin. The factors of welding were rotating speed rates at 1320, 1750 rpm and heat treatment conditions. They were divided into (1) As welded (AW) joints, (2) T6 Weld (TW) joints, (3) Weld T6 (WT) joints, (4) T6 Weld T6 (TWT) joints, (5) Solution treated Weld Artificially aged (SWA) joints and (6) Weld Artificially aged (WA) joints. Rotating speed and heat treatment (T6) condition were an important factor to micro, macro structure of metal and mechanical properties of the weld. Increasing rotating speed and different heat treatment condition impacted onto tensile strength due to the defects on joints. Therefore the optimum welding parameter on joint was a rotating speed 1320 rpm, the welding speed 160 mm/min, heat treatment condition of Weld T6 (WT) which obtained the highest tensile strength 228.92 MPa, as well as, highest hardness of 98.1 HV

Microstructural and Mechanical Behaviour Evaluation of Mg-Al-Zn Alloy Friction Stir Welded Joint

2020 ◽  
Vol 17 (3) ◽  
pp. 8150-8159
Author(s):  
Kulwant Singh ◽  
Gurbhinder Singh ◽  
Harmeet Singh
Keyword(s):  
Heat Treatment ◽  
Friction Stir Welding ◽  
Magnesium Alloys ◽  
Mechanical Performance ◽  
Fuel Efficiency ◽  
Research Work ◽  
Grain Structure ◽  
Tensile Fracture ◽  
Friction Stir ◽  
The Impact

The weight reduction concept is most effective to reduce the emissions of greenhouse gases from vehicles, which also improves fuel efficiency. Amongst lightweight materials, magnesium alloys are attractive to the automotive sector as a structural material. Welding feasibility of magnesium alloys acts as an influential role in its usage for lightweight prospects. Friction stir welding (FSW) is an appropriate technique as compared to other welding techniques to join magnesium alloys. Field of friction stir welding is emerging in the current scenario. The friction stir welding technique has been selected to weld AZ91 magnesium alloys in the current research work. The microstructure and mechanical characteristics of the produced FSW butt joints have been investigated. Further, the influence of post welding heat treatment (at 260 °C for 1 h) on these properties has also been examined. Post welding heat treatment (PWHT) resulted in the improvement of the grain structure of weld zones which affected the mechanical performance of the joints. After heat treatment, the tensile strength and elongation of the joint increased by 12.6 % and 31.9 % respectively. It is proven that after PWHT, the microhardness of the stir zone reduced and a comparatively smoothened microhardness profile of the FSW joint obtained. No considerable variation in the location of the tensile fracture was witnessed after PWHT. The results show that the impact toughness of the weld joints further decreases after post welding heat treatment.

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