Studies on Effect of Parent Metal Condition on the Room Temperature Mechanical Properties of Ti6Al4V Friction Welds

Rahul, R.; Rajulapati, Koteswararao V.; Reddy, G. Madhusudhan; Mohandas, T.; Rao, K. Bhanu Sankara

doi:10.1007/s12666-017-1084-z

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…To comprehend the failure patterns, the fracture surface of the tensile and impact test for friction stir processed samples along with the base metal is analyzed with a scanning electron microscope. The study reveals that fine dimples cause failure in the base metal, an increase of reinforcement causes the plastic deformation surface which results in reducing the ductility for tensile friction stir processed samples and for impact friction stir processed samples [16, 17], Figures 11a–d, 12a–d.…”

Section: Resultsmentioning

confidence: 97%

“…The improvement in hardness from 1.4 times to 1.6 times i.e, 95 Vickers hardness number to 171 Vickers hardness number in the AA7075 reinforced with micro boron carbide particles. This was due to the attribution of the fine dispersion of boron carbide particles in the aluminium matrix [6–22]. The performance of AA7075 were evaluated with the reinforcement of micro boron carbide particles by three passes in friction stir processing and stated that hardness is improved by 1.5 times (62 % more i. e., 39 Brinell hardness number to 55 Brinell hardness number) compared to base metal results in a fine dispersion of boron carbide grain size in the aluminum matrix [7].…”

Section: Introductionmentioning

confidence: 99%

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Influence of reinforcing particles on microstructure and mechanical properties of friction stir processed aluminium alloy AA7075‐T651

Bhavya

Suvarna

Ramulu

2021

Materialwissenschaft Werkst

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This paper emphasis the improvement of mechanical properties of AA7075‐T651 using friction stir processing through localized surface modification by adding nano boron carbide particles. The reinforcement techniques such as the groove and blind hole methods were used by changing reinforcements of nano boron carbide and a matrix of AA7075‐T651 surface composites volume percentages (2 %, 4 %, and 6 %) along with tool rotational speed and processing speeds. Optical microscopy, scanning electron microscope and x‐ray diffraction analysis were used to examine the particle dispersion for the surface composites and to correlate with the enhanced mechanical properties. Results revealed that high input parameters have given grain coarsening and precipitate agglomeration and low input parameters provide poor nugget metal consolidation and no vertical material flow. The L9 orthogonal Array designed and optimized the process parameters for enhancing the surface properties of processed samples. Mechanical properties like ultimate tensile strength, yield strength, hardness, percentage of elongation and impact strength were evaluated for the groove friction stir processing method and blind‐hole friction stir processing methods. From the results, it has been observed that the blind‐hole technique resulted in higher hardness and the homogenous dispersion of nano boron carbide particles in the stir zone than the groove method. Consequently, for blind‐hole friction stir processing, grey relational analysis (GRA) and particle swarm optimization (PSO) approaches were proposed to optimise process parameters. From the compared optimization results between grey relational analysis and particle swarm optimization, particle swarm optimization approach was shown the best optimization results. Successively, the optimum condition in the respective experimentation is accomplished. Based on these observation and results, final validation tests were carried by changing the volume percentages of reinforcement keeping tool rotation speed and tool processing speed as constant. It is apparent that dynamic recrystallization in aluminium alloy at the processed zone due to presence of heterogeneous nucleation sites with nano boron carbide particles.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Influence of reinforcing particles on microstructure and mechanical properties of friction stir processed aluminium alloy AA7075‐T651

Bhavya

Suvarna

Ramulu

2021

Materialwissenschaft Werkst

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“…The results showed an increase in grain size (42 ± 4 µm) in the weld zone; however, when performing a tensile test at high temperature, the strength and elongation improved significantly. The effect of post-weld heat treatments on the elevated temperature mechanical properties of Ti6Al4V friction welds was reported in [6]. The welding process was followed by heat treatment in both α+β and β regions, and then subjected to stress relieving treatment.…”

Section: Introductionmentioning

confidence: 99%

A Study of Annealing Effects on the Joints of a Rotary Friction Welds of AISI 1030 Steel

Trung,

Khanh,

Qui

2023

KEM

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This study is concerned with the post-heat treatment of rotational friction welds. AISI 1030 carbon steel parts are welded by rotational friction welding (RFW). The welding process parameters include friction pressure (P1), friction time (T1); Forging pressure (P2), forging time (T2). During the friction phase, the rotational speed is 1450 rpm; after that, the welding parts is stopped immediately and pressed together. The weld samples will be annealed at 650 °C for 4 hours. The change in the properties of the material of a RFW weld joint such as hardness, tensile strength, bending strength as well as grain size when undergone a heat treatment process was investigated. The obtained results show that the annealing process strongly changes the mechanical properties through altering the microstructure of the weld. Particularly, the weld hardness and tensile strength decrease significantly while the bending strength and elongation increase as a result of the increase in grain size and uniformity of the phase distribution. The annealed weld has a hardness reduction of nearly 20% and a tensile strength reduction of about 24% compared to the original weld. The elongation in the tensile test increases from 1.1% for weld specimens to 2.54% for post-heat-treated welds. In the bending test, the maximum load before the appearance of cracks on the specimen increased by about 42% when comparing the post-heat and original weld specimens.

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Effect of Heat Treatments on Tensile Fracture Behaviour of Ti-6Al-4V Alloy Friction Welds

Vikas,

Rahul,

Ramana

et al. 2023

J. Inst. Eng. India Ser. D

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Studies on Effect of Parent Metal Condition on the Room Temperature Mechanical Properties of Ti6Al4V Friction Welds

Cited by 3 publications

References 24 publications

Influence of reinforcing particles on microstructure and mechanical properties of friction stir processed aluminium alloy AA7075‐T651

Influence of reinforcing particles on microstructure and mechanical properties of friction stir processed aluminium alloy AA7075‐T651

A Study of Annealing Effects on the Joints of a Rotary Friction Welds of AISI 1030 Steel

Effect of Heat Treatments on Tensile Fracture Behaviour of Ti-6Al-4V Alloy Friction Welds

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