Processing and mechanical properties of a metastable titanium alloy (ti-5al-5v-5mo-3cr) by selective laser meltingThursday (09.11.2017) 15:20 - 15:40 Part of:
The metastable beta titanium alloy Ti-5Al-5V-5Mo-3Cr is characterised by multifaceted mechanical properties (high-strength, hardened, ductile) depending on applied heat treatment. Compared to α-β titanium alloy Ti-6Al-4V, a higher tensile strength up to 1,400 MPa can be achieved. As a result, Ti-5Al-5V-5Mo-3Cr is used for special aerospace applications e.g. landing gear components or helicopter rotors.
The first aim of this paper is to study the process ability of Ti-5Al-5V-5Mo-3Cr by using selective laser melting. In this case suitable and stable process parameters have been developed, so that a high material density as well as high surface quality can be achieved. Material densities above 99.98 % were achieved during the selective laser melting process. Furthermore, the slice thickness has an influence of the mechanical properties. Especially the layer thickness of 30 μm and 50 μm are considered.
The second aim of this paper is to evaluate the mechanical properties of Ti-5Al-5V-5Mo-3Cr in comparison to Ti-6Al-4V by using of tensile test. The tests were performed according to different heat treatments and refrigeration methods. The analysed temperature range for the Ti-5Al-5V-5Mo-3Cr was between 500 °C and 790 °C and for Ti-Al6-4V between 655°C and 955°C according to refrigeration with air, water or under argon isolation. By modification of the heat treatment, the tensile strength of Ti-5Al-5V-5Mo-3Cr can be increased up to 1,470 MPa significantly. The absolute value of elongation at break are reduced approximately by half due to the heat treatment.
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