In this study, the effect of build orientation on the mechanical properties of Hastelloy X fabricated by laser powder bed fusion (LPBF) process was investigated. Initial microstructural analysis revealed an equiaxed grain structure with random crystallographic orientation and annealing twins. Intragranular precipitates identified as Cr-rich M23C6 and Mo-rich M6C carbides were observed, along with a dense dislocation network and localized dislocation accumulation around the carbides. Mechanical testing showed negligible variation in yield strength with respect to build orientation; however, both ultimate tensile strength and elongation exhibited a clear increasing trend with higher build angles. Notably, the specimen built at 90° exhibited approximately 22% higher tensile strength and more than twice the elongation compared to the 0° specimen.

1. Introduction
2. Experimental Section
3. Results and Discussion
4. Conclusion
Funding
Conflict of Interest
Data Availability Statement
Author Information and Contribution
Acknowledgments
References

• 노구원((주)이엠엘) | GooWon Noh (EML Co., Ltd., Suwon 16229, Republic of Korea)
• 손석수(고려대학교 미래융합소재학과) | Seok Su Sohn (Department of Advanced Future Convergence Materials, Korea University, Seoul 02841, Republic of Korea)
• 윤성준(한국재료연구원, 극한재료연구소, 고려대학교 미래융합소재학과) | Seong-June Youn (Korea Institute of Materials Science (KIMS), Changwon 51508, Republic of Korea, Department of Advanced Future Convergence Materials, Korea University, Seoul 02841, Republic of Korea)
• 나영상(한국재료연구원, 극한재료연구소) | Young-Sang Na (Korea Institute of Materials Science (KIMS), Changwon 51508, Republic of Korea) Corresponding author
• 김영균(한국재료연구원, 극한재료연구소) | Young-Kyun Kim (Korea Institute of Materials Science (KIMS), Changwon 51508, Republic of Korea) Corresponding author