Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 811, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.141089
Keywords
Selective laser melting; Al?Mn alloy; Keyhole; Microstructure; Tensile properties
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Funding
- National Key R&D Program of China [2018YFB1106300]
- National Natural Science Foundation of China [51604227]
- (Research Fund of the State Key Laboratory of Solidification Processing, NPU), China [2020-TZ02]
- Fundamental Research Funds for the Central Universities [31020180QD130]
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This study investigates the effect of melting modes on microstructure evolution and tensile properties of selective laser melted Sc modified Al-Mn alloy. By changing the melting mode, the grain width decreases significantly, leading to an increase in yield strength and elongation.
The effect of melting modes on microstructure evolution and tensile properties of selective laser melted (SLM-ed) Sc modified Al?Mn alloy (Al?5Mn-0.6Sc) is investigated in this work. With the transition of melting mode from conduction to keyhole by coinstantaneous increasing the laser power from 200 W to 380 W and the scanning speed from 800 mm/s to 1400 mm/s, the columnar grain width significantly decreases by 88% from 34.9 ?m to 4.2 ?m. Consequently, the yield strength and the elongation increase simultaneously from 266 MPa and 10% to 308 MPa and 17%, which increase by 16% and 70%, respectively. The refinement and orientation diversification of the grains caused by keyhole mode simultaneously improve the strength and elongation by inducing the HallPetch effect and enhancing the crack path tortuosity. This work reveals the feasibility and the mechanism of changing melting mode acts as a method to regulate the SLM-ed microstructure and mechanical properties.
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