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Determination of Process Map For Hot Forming of Ti-6al-4v

Oluşturulma Tarihi: 19-06-2018

Niteleme Bilgileri

Tür: Tez

Alt Tür: Yüksek Lisans Tezi

Yayınlanma Durumu: Yayınlanmamış

Dosya Biçimi: PDF

Dil: İngilizce

Konu(lar): TEKNOLOJİ, İmalat, Metal imalat. Metal işçiliği,

Yazar(lar): Demirkol, Yasin (Yazar),

Emeği Geçen(ler): Şimşir, Caner (Danışman),

Anahtar Kelimeler

Titanium, Forging, Mechanical characterization, Flow curve, Process map


Özet

Titanium alloys are used in the field of aviation, turbine blades, gas turbines and engine parts, propellers and many other parts because of their resistance to corrosion as well as their high strength to weight ratio. However, in order to take advantage of these properties, titanium alloys having low ductility at room temperature require high temperature forming techniques which have inherent disadvantages. Hot forging is the most common method for manufacturing these components.Titanium hot forging is more complicated than conventional steel forging due to many reasons: flow instabilities that may occur during forging, macro-micro cracks, static and dynamic strength loss due to melting at grain boundaries and heterogeneous microstructure and alpha layer formation due to air interaction are most common problems. More important than these, the microstructure formed during the titanium alloys forging cannot be repaired by the post-forging heat treatment as opposed to many steels. For this reason, titanium forging must be designed as a "thermo-mechanical-metallurgical process", not only as a forming process.In this work, the material data required for designing the hot forging process of the Ti-6Al-4V alloy to satisfy the above conditions was obtained by experimental methods. A wide range of temperature and strain rate controlled compression tests was performed to find the material law parameters that determine the behavior of the material in the plastic region. A "Process Map" was generated which restricts the amount of temperature, deformation amount and speed to obtain forged products without any problems and desired microstructure.


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