Microstructural Evolution in Ti-6Al-4V Friction Stir Welds

Ramírez, Antonio J.; Juhas, M.C.

doi:10.4028/www.scientific.net/msf.426-432.2999

Cited by 112 publications

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“…Friction stir welding must clearly disrupt the base microstructure both through the thermal and deformation components of the process [174] but the consequences of this on performance during fabrication and service need investigation. General investigations on fatigue performance indicate that the crack growth rate in the HAZ can be higher or lower than the base material depending on specimen geometry, microstructure and residual stress levels [142].…”

Section: Titanium Alloysmentioning

confidence: 99%

Recent advances in friction-stir welding – Process, weldment structure and properties

Nandan

DebRoy

Bhadeshia

2008

Progress in Materials Science

1,781

911

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Friction stir welding is a refreshing approach to the joining of metals. Although originally intended for aluminium alloys, reach of FSW has now extended to a variety of materials including steels and polymers. This review deals with the fundamental understanding of the process and its metallurgical consequences. The focus is on heat generation, heat transfer and plastic flow during welding, elements of tool design, understanding defect formation and the structure and properties of the welded materials.

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Section: Titanium Alloysmentioning

confidence: 99%

Recent advances in friction-stir welding – Process, weldment structure and properties

Nandan

DebRoy

Bhadeshia

2008

Progress in Materials Science

1,781

911

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“…La microestructura en la ZA está influenciada significativamente por las velocidades de rotación y penetración. Para lograr la unión en la aleación de titanio α+β la temperatura en la zona ZA debe superar la temperatura β-transus, y por lo tanto se forma una microestructura laminar completa [30][31][32].…”

Section: Evolución Microestructural En Uniones De La Aleación Ti-6al-unclassified

Evolución Microestructural en Uniones de la Aleación Ti-6Al-4V Mediante el Proceso de Soldadura de Punto por Fricción-agitación

et al. 2016

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Este es un artículo publicado en acceso (Open Access) abierto bajo la licencia Creative Commons Attribution NonCommercial, que permite su uso, distribución y reproducción en cualquier medio, sin restricciones siempre que sin fines comerciales y que el trabajo original sea debidamente citado.Recibido: 28 Enero, 2016 Aprobado: 06 Jun., 2016 E-mail: flor.garciacs@uanl.edu.mx (FAG-C)Resumen: La soldadura de punto por fricción-agitación (Friction Stir Spot Welding, FSSW) es un tema de reciente desarrollo e interés, principalmente en aleaciones de Titanio, ya que existen estudios previos realizados en aleaciones de aluminio, magnesio, aceros y polímeros. Las aleaciones de Titanio tienen una amplia aplicación en la industria aeronáutica, principalmente como componentes en el tren de aterrizaje en aviones comerciales, por lo cual este trabajo se centra en la aleación Ti-6Al-4V, este tipo de aleación presenta fases alfa (α) y beta (β), brindado mejor balance en propiedades mecánicas de dureza y esfuerzo a la tensión. El proceso FSSW se realizó mediante un centro de maquinado de alta velocidad, utilizando una velocidad de rotación de 500 RPM, una velocidad de penetración de la herramienta de 2 mm/s y 3 s en tiempo de sostenimiento, en láminas con un espesor de 1,5 mm y una longitud de traslape de 20 mm. Los resultados mostraron el efecto de las variables del proceso de soldadura FSSW sobre la microestructura de la aleación Ti-6Al-4V ocasionada por el efecto térmico y la deformación plástica del proceso de la soldadura, concluyendo que una adecuada combinación de parámetros permite realizar una unión sin defectos. Palabras-clave:Aleación Ti-6Al-4V; Análisis microestructural; Soldadura de punto por fricción-agitación (FSSW); Aleaciones aeronáuticas; Zona afectada termo-mecánicamente. Microstructural Evolution in Joints of Ti-6Al-4V Alloy by Friction Stir Spot WeldingAbstract: Friction stir spot welding (FSSW) is a process of recent development and interest, mainly in titanium alloys, since there are previous studies of aluminum alloys, magnesium, steel and polymers. Titanium alloys have a wide range of applications in the aeronautical industry, mainly in the components of commercial aircrafts as landing gear. Therefore, this work was focused on the Ti-6Al-4V alloy, this type of alloy has alpha (α) and beta (β) phases, giving a better balance between its mechanical properties as hardness and tensile strength. The FSSW process was performed using a high speed machining center, with a rotational speed of 500 RPM, plunge speed of 2 mm/s and 3 sec in dwell time, in sheets with a thickness of 1.5 mm and overlap length of 20 mm. The results showed the effect of process variables during FSSW process on microstructure of Ti-6Al-4V alloy caused by the thermal effect and plastic deformation of the welding process, obtaining an appropriate combination of parameters and binding flawless.

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“…FSW has mostly been applied as a solid-state welding technique to lightweight and low-melting-point materials such as Al 1,2 and Mg. 3,4 However, recently, FSW has been tested on materials that are strong and have a high melting point. [5][6][7][8][9] Some studies on FSW have also investigated the microstructure and 1 mechanical properties of pure Ti and Ti alloys; 5,[10][11][12][13][14][15] however, there is still a considerable gap in knowledge about this topic. The Ti-6Al-4V alloy is extremely hard and undergoes allotropic transformation; it also exhibits considerable microstructural evolution during FSW.…”

Section: Introductionmentioning

confidence: 99%

Effect of tool rotational speed on mechanical properties and microstructure of friction stir welding joints within Ti–6Al–4V alloy sheets

Lee

Baik

2017

Advances in Mechanical Engineering

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Friction stir welding of Ti-6Al-4V alloy sheets was successfully performed with a tungsten carbide (WC) tool, and the effect of the tool rotational speed on the microstructure and mechanical properties of the joints was evaluated. The microstructure was investigated using field emission scanning electron microscopy, electron backscattered diffraction and X-ray diffraction measurements. Tensile, Charpy impact and Vickers hardness tests were performed to evaluate the joints' mechanical properties. The process peak temperature of each welding condition was measured at the bottom of a specimen. Regardless of the welding conditions, the alpha (a) and alpha prime (a 0 ) phases were detected in the stir zone, whereas the base metal was composed of alpha (a) and beta (b) phases. The tensile strength and hardness of the stir zone increased as the tool rotational speed increased. The impact absorption energy was found to be equal to that of the base metal. Moreover, a phase transformation from the b to the a 0 phases occurred in the stir zone during friction stir welding and the evolution of the microstructure in the stir zone significantly affected the mechanical properties of the joints.

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Microstructural Evolution in Ti-6Al-4V Friction Stir Welds

Cited by 112 publications

References 0 publications

Recent advances in friction-stir welding – Process, weldment structure and properties

Recent advances in friction-stir welding – Process, weldment structure and properties

Evolución Microestructural en Uniones de la Aleación Ti-6Al-4V Mediante el Proceso de Soldadura de Punto por Fricción-agitación

Effect of tool rotational speed on mechanical properties and microstructure of friction stir welding joints within Ti–6Al–4V alloy sheets

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