Abstract
Static coarsening mechanism of selective laser melted (SLMed) Ti–6Al–4V with a lamellar microstructure was established at temperatures from 700 °C to 950 °C. Microstructure evolution revealed that high heat treatment temperature facilitated martensite decomposition and promoted lamellae growth. At each temperature, the growth rate decreased with increasing holding time. The static coarsening behaviour of SLMed Ti–6Al–4V can be interpreted by Lifshitz, Slyozov, and Wagner (LSW) theory. The coarsening coefficient were 0.33, 0.33–0.4, 0.4–0.5 for 700–800 °C, 900 °C and 950 °C, respectively. This indicated the coarsening mechanism was bulk diffusion at 700–800 °C, and a combination of bulk diffusion and interface reaction at 900 °C and 950 °C conditions.
Original language | English |
---|---|
Pages (from-to) | 1578-1586 |
Number of pages | 9 |
Journal | Journal of Materials Science and Technology |
Volume | 35 |
Issue number | 8 |
DOIs | |
Publication status | Published - 1 Aug 2019 |
Keywords
- Heat treatment
- Microstructure
- Selective laser melting
- Ti–6Al–4V
Equipment
-
Centre for Additive Manufacturing (MCAM)
Aijun Huang (Manager)
Materials Science & EngineeringFacility/equipment: Facility
-
Centre for Electron Microscopy (MCEM)
Flame Sorrell (Manager) & Peter Miller (Manager)
Office of the Vice-Provost (Research and Research Infrastructure)Facility/equipment: Facility