Microstructure and Mechanical Properties of Additively Manufactured Haynes 282: A Comparative Analysis between Laser Powder Bed Fusion and Laser Powder Directed Energy Deposition Technologies

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Date

2023

Authors

Ahmad, Nabeel
Ghiaasiaan, Reza
Gradl, Paul R.
Shao, Shuai
Shamsaei, Nima

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University of Texas at Austin

Abstract

This study compares the microstructure and tensile properties of Haynes 282 fabricated using laser powder bed fusion and laser powder directed energy deposition. Both sets underwent stress-relieving, followed by hot isostatic pressing, and the standard double aging heat treatment. Tensile testing was conducted at room temperature on specimens fabricated with both technologies to evaluate and compare their tensile behaviors. Results show that the ultimate tensile and yield strengths of laser powder bed fused specimens were 18% and 57% higher, respectively than those of laser powder directed energy deposited ones, whereas the elongation to failure was similar in both. The difference in strengths is attributed to the differences in the size of γ' precipitates and grains, i.e., those in the laser powder directed energy deposited specimens being larger, whereas similar elongation to failure is attributed to the carbide debonding dominating the fracture mechanism in both batches.

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