Page 69 - MSAM-3-3

Materials Science in Additive Manufacturing In-situ alloying of Ti41Nb by LPBF
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(1) Implementation of a contour scanning strategy Ethics approval and consent to participate
resulted in shorter thermal rest times at the core of the
part, due to the shorter intervals between subsequent Not applicable.
laser scans, and conversely longer rest times near the Consent for publication
boundary of the part.
(2) Significant disparities in the quality of the part Not applicable.
were observed between the core and side regions,
attributable to the varying thermal rest times induced Availability of data
by contour scanning. Data are available from the corresponding author on
(3) Utilizing a longer stripe scan width, thus extending reasonable request.
thermal rest times, yielded significant differences in
tensile properties. Samples 481-10 and 317-10, which References
underwent longer thermal rest times, showed higher 1. Chua CK, Leong KF. 3D Printing and Additive Manufacturing:
UTS values compared to samples 481-1 and 317-1, Principles and Applications. Singapore: World Scientific; 2017.
respectively (1007 MPa vs. 826 MPa and 1005 MPa vs.
876 MPa, respectively). Moreover, samples 481-1 and doi: 10.1142/10200
317-1 demonstrated higher elongation values (15.8% 2. Radhakrishnan J, Kumar P, Gan SS, Bryl A, McKinnell J,
and 26.3%, respectively) compared to samples 481-10 Ramamurty U. Fatigue resistance of the binder jet printed
and 317-10 (13.7% for both). The presence of more 17-4 precipitation hardened martensitic stainless steel.
unmelted Nb with longer stripe scan widths may have Mater Sci Eng A. 2023;865:144451.
contributed to increased ductility in the samples. doi: 10.1016/j.msea.2022.144451
These findings underscore the importance of 3. Radhakrishnan J, Kumar P, Gan SS, Bryl A, McKinnell J,
considering thermal rest time variation in in situ alloying Ramamurty U. Microstructure and tensile properties of
processes, as it can profoundly impact the quality and binder jet printed 17-4 precipitation hardened martensitic
mechanical properties of manufactured parts. stainless steel. Mater Sci Eng A. 2022;860:144270.
doi: 10.1016/j.msea.2022.144270
Acknowledgments
4. Li SH, Kumar P, Chandra S, Ramamurty U. Directed energy
None. deposition of metals: Processing, microstructures, and
mechanical properties. Int Mater Rev. 2022;68:1-43.
Funding
doi: 10.1080/09506608.2022.2097411
This research is supported by the National Research 5. Huang S, Kumar P, Lim CWJ, Radhakrishnan J, Ramamurty U.
Foundation, Prime Minister’s Office, Singapore under its Fracture behavior of PH15-5 stainless steel manufactured via
Medium-Sized Centre funding scheme. directed energy deposition. Mater Des. 2023;235:112421.

Conflicts of interest doi: 10.1016/j.matdes.2023.112421
Swee Leong Sing serves as the Associate Editor of the 6. Wei F, Wei S, Lau KB, et al. Compositionally graded
journal, but did not in any way involve in the editorial and AlxCoCrFeNi high-entropy alloy manufactured by laser
peer-review process conducted for this paper, directly or powder bed fusion. Materialia. 2022;21:101308.
indirectly. Other authors declare they have no competing doi: 10.1016/j.mtla.2021.101308
interests. 7. Brodie EG, Medvedev AE, Frith JE, Dargusch MS,

Author contributions Fraser HL, Molotnikov A. Remelt processing and
microstructure of selective laser melted Ti25Ta. J Alloys
Conceptualization: Sheng Huang and Swee Leong Sing Compd. 2020;820:153082.
Formal analysis: Guo Ren Chou and Sheng Huang doi: 10.1016/j.jallcom.2019.153082
Investigation: Guo Ren Chou
Methodology: Guo Ren Chou and Sheng Huang 8. Brodie EG, Richter J, Wegener T, Niendorf T, Molotnikov A.
Low-cycle fatigue performance of remelted laser powder
Supervision: Swee Leong Sing bed fusion (L-PBF) biomedical Ti25Ta. Mater Sci Eng A.
Validation: Swee Leong Sing 2020;798:140228.
Writing – original draft: Guo Ren Chou
Writing – review and editing: Sheng Huang and Swee Leong doi: 10.1016/j.msea.2020.140228
Sing 9. Wang C, Chandra S, Huang S, Tor SB, Tan X. Unraveling

Volume 3 Issue 3 (2024) 12 doi: 10.36922/msam.3506