TY - JOUR

T1 - Processing of Ti-5553 with improved mechanical properties via an in-situ heat treatment combining selective laser melting and substrate plate heating

AU - Schwab, Holger

AU - Bönisch, Matthias

AU - Giebeler, Lars

AU - Gustmann, Tobias

AU - Eckert, Jürgen

AU - Kühn, Uta

PY - 2017/9

Y1 - 2017/9

N2 - In this study the Ti-based alloy Ti-5Al-5V-5Mo-3Cr (wt%) was processed using selective laser melting (SLM) while keeping the substrate plate at a constant temperature of 500 °C. Cubic samples were successfully fabricated with a relative density of about 99%. Their microstructures were analysed and correlated with the mechanical properties and compared with the fabrication state of non-heated selective laser melted Ti-5553. Investigations by XRD, SEM and TEM revealed the formation of a microstructure composed of a β-phase matrix and finely dispersed α-phase plates when heating was conducted. The microstructure critically depends on the thermal history and was found to have a pronounced influence on the mechanical behaviour. The mechanical properties of the heated specimens showed an enhanced compressive strength of about 1600 MPa while the deformability remained relatively high. These results demonstrate that selective laser melting is capable of creating bulk parts with improved mechanical by precipitation hardening realized by applying an additional substrate heating during the process.

AB - In this study the Ti-based alloy Ti-5Al-5V-5Mo-3Cr (wt%) was processed using selective laser melting (SLM) while keeping the substrate plate at a constant temperature of 500 °C. Cubic samples were successfully fabricated with a relative density of about 99%. Their microstructures were analysed and correlated with the mechanical properties and compared with the fabrication state of non-heated selective laser melted Ti-5553. Investigations by XRD, SEM and TEM revealed the formation of a microstructure composed of a β-phase matrix and finely dispersed α-phase plates when heating was conducted. The microstructure critically depends on the thermal history and was found to have a pronounced influence on the mechanical behaviour. The mechanical properties of the heated specimens showed an enhanced compressive strength of about 1600 MPa while the deformability remained relatively high. These results demonstrate that selective laser melting is capable of creating bulk parts with improved mechanical by precipitation hardening realized by applying an additional substrate heating during the process.

U2 - 10.1016/j.matdes.2017.05.010

DO - 10.1016/j.matdes.2017.05.010

M3 - Article

VL - 130.2017

SP - 83

EP - 89

JO - Materials and Design

JF - Materials and Design

SN - 0264-1275

IS - 15 September

ER -