|About this Abstract
||Materials Science & Technology 2019
||Additive Manufacturing of Metals: Microstructure and Material Properties of Nickel-based Alloys
||Microstructural Analysis of Isolated Melt-tracks in IN738 Produced by Laser Powder Bed Fusion
||Abdul Shaafi Shaikh, Masoud Rashidi, Eduard Hryha, Kevin Minet-Lallemand
|On-Site Speaker (Planned)
||Abdul Shaafi Shaikh
Inconel-738 is a nickel-base superalloy widely used in gas turbine hot-section components. There is significant impetus to manufacture this superalloy using additive manufacturing techniques, particularly laser-powder bed fusion (L-PBF), due to the design freedom afforded by such manufacturing methods. However, IN738 is susceptible to cracking caused by solidification or liquation cracking mechanisms. Liquation cracking occurs in the heat-affected-zone, while solidification cracking occurs within the fusion zone.
The re-melting and thermal cycling during LPBF alters the microstructure, making it difficult to accurately study the as-solidified microstructure. To solve this problem, single melt tracks with different process parameters were manufactured to isolate the effect of heating and re-heating and hence study the as-solidified microstructure during LPBF. Scanning electron microscopy equipped with energy dispersive X-ray spectroscopy and electron backscattered detector was employed to study crack initiation. A detailed investigation of the as-solidified microstructure that is prone to cracking is also provided.
||Planned: At-meeting proceedings; Planned: At-meeting proceedings