About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Materials Design and Alloy Development V – Design Fundamentals
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Presentation Title |
Effect of Carbon Content on the Microstructure and Mechanical Properties of Steels Additively Manufactured by Laser Powder Bed Fusion |
Author(s) |
Thinh Hyunh, Nemanja Kljestan, Abhishek Mehta, Kevin Graydon, Marko Knezevic, Brandon McWilliams, Kyu Cho, Yongho Sohn |
On-Site Speaker (Planned) |
Thinh Hyunh |
Abstract Scope |
Novel carbon-bearing steels were gas-atomized and used as powder feedstock to explore the feasibility of additive manufacturing by LPBF. Charge alloys were inductively melted at 1800°C under Argon shrouding and gas-atomized using Argon at a pressure of 2 MPa to produce low- and high-carbon bearing alloys. LPBF optimization was performed as a function of laser power and scan speed, and relative density higher than 99 % was achieved. Carbon-bearing alloys were compositionally modulated to produce austenite or martensite in the as-printed condition. The low carbon-bearing alloy contained 97% quenched martensite and 3% austenite, while the high carbon-bearing alloy contained 98% austenite and 2% martensite. Changes in the as-built microstructure were documented as a function of laser scan speed, while phase analyses were examined using electron microscopy and x-ray diffraction. The effect of C on the mechanical performance and solid-state phase transformation were elucidated via hardness and uniaxial tension tests. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Phase Transformations, Solidification |