About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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Additive Manufacturing: Alloy Design to Develop New Feedstock Materials III
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Presentation Title |
Additive Manufacturing Feasibility Investigation Using Single Track Study for the Fabrication of Borated Austenitic Stainless Steels via Laser Powder Bed Fusion |
Author(s) |
Abhishek Mehta, Devin D Imholte, Nicolas E Woolstenhulme, Daniel M Wachs, Yongho Sohn |
On-Site Speaker (Planned) |
Abhishek Mehta |
Abstract Scope |
Borated austenitic stainless steels can be used in nuclear applications for criticality control in fuel storage and reactivity control and flux adjustment in reactors. Single laser scans (SLS) were performed on the bulk S30465 and S30467 alloys to explore the feasibility to fabricate them using laser powder bed fusion (LPBF). SLS were performed as functions of laser power and scan speed. In S30465, melt-pools developed keyhole porosities at 200 W for low scan speeds (≤ 500 mm/s), but no flaws were observed at 350 W. In S30467, melt-pools developed keyhole porosities at 200 W for low scan speeds (≤ 300 mm/s), and a significant cracking was observed at 350 W. Dense and defect free solidification occurred for both alloys with the laser power of 200 W using intermediate scan speeds (700 – 1100 mm/s). Microstructure of the solidified melt-pool consisted of ultra-fine γ + (Cr,Fe)2B eutectic in continuous γ-phase matrix. |