Effect of brazing temperature on microstructure and mechanical properties of dissimilar joints of titanium/stainless steel joint brazed by Al interlayer

Bartłomiej Szwed, Marek Konieczny

Abstrakt


In present investigation diffusion brazed joints between titanium (Grade 2) and stainless steel (X5CrNi18-10) using 100 μm thick aluminum foil as a ller metal were produced at the temperature range from 550 to 700 °C for 60 minutes under 2 MPa bonding pressure in vacuum. The effect of temperature on the microstructure was investigated us- ing light optical microscopy and scanning electron microscopy equipped with an energy dispersive X-ray system (EDS) to determine chemical composition of joint. The FeAl3 and Fe2Al5 intermetallic layers were observed at the stain- less steel-aluminum interfaces. At the aluminum-titanium interfaces TiAl, TiAl2, TiAl3 intermetallic layers were identied. The thickness of the reaction products increases with increase in the joining temperature. The highest shear strength (91 MPa) was achieved for samples prepared at 600 °C. 

Streszczenie

Lutowanie dyfuzyjne zostało wykonane pomiędzy tytanem (Grade 2) a stalą nierdzewna (X5CrNi18-10) z wykorzystaniem foli aluminiowej o grubości 100 μm. Lutowanie zostało przeprowadzone w temperaturach od 550 do 700 °C w czasie 60 minut pod dociskiem 2 MPa w próżni. Wpływ temperatury na mikrostrukturę połączenia został przeba- dany na mikroskopie optycznym oraz elektronowym mikroskopie skaningowym wyposażonym w mikroanalizator rentgenowski (EDS). Na granicy stali nierdzewnej z aluminium wydzieliły się warstwy faz FeAl3 oraz Fe2Al5. Struktura załącza od strony tytanu składała się oraz warstw faz międzymetalicznych TiAl, TiAl2, TiAl3. Grubość warstw reakcyjnych rosła wraz ze wzrostem temperatury lutowania. Najwyższą wytrzymałość (91 MPa) uzyskano podczas testów ścinania technologicznego połączeń lutowanych w temperaturze 600 °C. 



Słowa kluczowe


diffusion brazing; titanium; stainless steel; microstructure; mechanical properties

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Bibliografia


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DOI: http://dx.doi.org/10.26628/wtr.v89i6.779

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