|About this Abstract
||Materials Science & Technology 2019
||Late News Poster Session
||P3-45: Effect of Heat Treatments on Microstructural Transformations and Properties of Wire-arc Additively Manufactured Nickel Aluminum Bronze
||Dharmendra Chalasani, Kanwal Chadha, G.D. Janaki Ram, Mohsen Mohammadi
|On-Site Speaker (Planned)
The effect of three different heat treatments was investigated on the microstructural transformation and properties of nickel aluminum bronze Cu-9Al-4Fe-4Ni-1Mn fabricated through wire-arc additive manufacturing (WAAM). The heat treatments were performed at conditions of (a) 350oC/2 hours/air cooling (HT-1), (b) 550oC/4 hours/air cooling (HT-2), and (c) 675oC/6 hours/air cooling (HT-3). Microstructural evolution along the building direction was characterized with optical microscopy, scanning electron microscopy, and electron backscatter diffraction (EBSD). The microstructure of WAAM-NAB consists of κii (Fe3Al) and κiii (NiAl) phases in the interdendritic regions, and fine Fe-rich κiv particles in the Cu-matrix. HT-1 cycle had little impact on microstructural changes and mechanical properties. During HT-2 cycle, retained β was transformed to α+κ, and the morphology of κiii was changed from lamellar to a more globular. At 675oC, mechanical properties were enhanced due to the precipitation and significant increase in the volume fraction of κiv particles.