|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Defects and Properties of Cast Metals IV
||Effect of build height on micro-cracking of additively manufactured superalloy RENÉ 108 thin-wall components
||Apratim Chakraborty, Reza Tangestani, Trevor Sabiston, Nicholas Krutz, Lang Yuan, Étienne Martin
|On-Site Speaker (Planned)
The micro-cracking tendency along the build height in superalloy RENÉ 108 thin-wall components made using laser powder bed fusion (LPBF) was investigated. Microstructure characterization using scanning electron microscopy (SEM) demonstrates dendritic morphologies in the vicinity of the crack boundaries, suggesting micro-crack formation during the final stages of solidification. Crack densities for three different regions along the part height, calculated via image and statistical analysis tools, shows micro-cracking is lower close to the base plate. Comparison with simulations, performed using the finite element modelling (FEM) approach, shows that the transition from compressive to tensile stresses is faster in the middle and top sections, corresponding to increased micro-crack propagation. Cooling rates computed along the build height, based on primary dendrite arm spacing (PDAS) measurements, reinforce the crack propagation hypothesis over crack nucleation. Micro-crack variation along the part height is attributed to higher stress rates assisting micro-crack propagation near the build surface.
||Additive Manufacturing, Other, Other