Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 747, Issue -, Pages 225-231Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.12.100
Keywords
Aerospace; Titanium beta alloys; Selective laser melting; Ductility
Categories
Funding
- CSIR (Council for Scientific and Industrial Research, South Africa)
- Department of Science and Technology, South Africa
Ask authors/readers for more resources
Beta Ti-alloys are known for their high fracture toughness and ductility, and are used in applications where these properties are needed, such as the aerospace and biomedical industries. The selective laser melting of the alpha + beta Ti-6Al-4V alloy has been extensively studied for applications in the aerospace industry. Although there has been success in building small parts, the acicular alpha' microstructure becomes a problem when large parts (800 x 400 x 500 mm(3)) are built. The acicular alpha' microstructure of Ti-6Al-4V causes low fracture toughness and low ductility ( < 10% elongation), which causes the parts to warp and delaminate from the base plate, even before completion, due to the stress build-up. This work investigated the microstructure and mechanical properties of the beta titanium alloy Ti-38644 and two-phase Ti-6Al-4V in the as-built condition, using scanning electron microscopy with electron backscattered diffraction imaging, optical microscopy, micro-Vickers hardness and tensile tests. Ti-6Al-4V had a fine martensitic alpha' structure inside columnar beta grains, whereas Ti-38644 had a fully beta microstructure, resulting in lower strength. The percentage elongation of Ti-38644 was thrice that of Ti-6Al-4V, showing potential for building large parts.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available