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Abstract
The effect of the friction stir welding processing (FSP) speed rotation and feed rate on the microstructure of a Ti-6Al-4V alloy was investigated in a 2-mm-thick alloy. The joints were processed above the β-transus temperature. The prior β-grain size in the stir zone depended on the speed rotation that is related with the peak temperature and the size of the lamellar structure depended on the feed that control the cooling rate. Some regions with bimodal refined grains structure were observed on stir zone. A hardness increase on friction stir processed region was observed in all conditions, except for 1550 RPM and feed 50 mm/min. It was associated to a coarse lamellar structure.
Highlights
Titanium and its alloys are used in aerospace, marine, chemical, petrochemical, engineering and biomedical applications because of its amazing range of properties
The high strength of titanium alloys combined with its metallurgical stability at high temperatures and its low flow rates, makes them favorable for jet engine components such as blades and disks, aerospace applications such as components for rocket engines and fuel tank
In the biomedical field applications, titanium displays a great advantage in medical use, is fully biocompatible, titanium is one of few materials that are inert to corrosion by any human body fluids and tissues, a major requirement for implantation in human body
Summary
Titanium and its alloys are used in aerospace, marine, chemical, petrochemical, engineering and biomedical applications because of its amazing range of properties. The high strength of titanium alloys combined with its metallurgical stability at high temperatures and its low flow rates, makes them favorable for jet engine components such as blades and disks, aerospace applications such as components for rocket engines and fuel tank They are used in aircraft fuselage structures because of its good relationship strength/weight ratio, such as landing gear, beams, hydraulic lines, wing boxes, spacers and screws. In the biomedical field applications, titanium displays a great advantage in medical use, is fully biocompatible, titanium is one of few materials that are inert to corrosion by any human body fluids and tissues, a major requirement for implantation in human body It is used in prosthetic devices for bone and joint implants, heart valves and dental implants. Another 20% to 30% use is for pure titanium [1]
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