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Effect of remelting process on surface quality and tensile behaviour of a maraging steel manufactured by selective laser melting

Song, Jun, Tang, Qian, Feng, Qixiang, Ma, Shuai, Han, Quanquan and Setchi, Rossitza 2020. Effect of remelting process on surface quality and tensile behaviour of a maraging steel manufactured by selective laser melting. Presented at: SDM-2020: 7th International Conference on Sustainable Design and Manufacturing, 9-11 September. Published in: Scholz, Steffen G., Howlett, Robert J. and Setchi, Rossi eds. Sustainable Design and Manufacturing 2020: Proceedings of the 7th International Conference on Sustainable Design and Manufacturing (KES-SDM 2020). Smart Innovation, Systems and Technologies Springer, pp. 251-260. 10.1007/978-981-15-8131-1_23

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Abstract

Selective laser melting (SLM) of 18Ni-300 maraging steel is of substantial interest due to its wide application as a mould material in automotive sectors. Selective laser remelting (SLRM) is often employed during SLM, which offers the potential to improve quality of the metallic parts fabricated by SLM. This study investigated the effect of the remelting process on the surface quality and tensile strength of 18Ni-300 maraging steel manufactured by SLM. The experimental results demonstrated that the remelting process was found to contribute to a smoother surface morphology on the top surface and no obvious observed difference in the side surface morphology. The SLM-built and SLRM-built samples exhibited the Ra roughness values of 3.11 ± 0.31 μm and 3.44 ± 0.48 μm, respectively, which showed no significant difference. The Ra values on the side surface increased from 7.76 ± 0.25 μm to 11.57 ± 3.44 μm after remelting. This was because more powder particles were exposed to molten pools during remelting. In addition, the yield strength increased from 890 ± 27 MPa to 938 ± 36 MPa after the remelting process, whereas the ultimate tensile strength remained at the same level. The SLM-built and SLRM-built samples achieved the ultimate tensile strength values of 1068 ± 12 MPa and 1070 ± 19 MPa, respectively. Moreover, both processing conditions showed a ductile fracture mode. These significant findings indicate the possibility of combining SLM and selective laser remelting to produce better performing 18Ni-300 maraging steel components.

Item Type: Conference or Workshop Item (Paper)
Date Type: Published Online
Status: Published
Schools: Engineering
Publisher: Springer
ISBN: 9789811581304
Last Modified: 27 Jul 2021 09:15
URI: http://orca.cardiff.ac.uk/id/eprint/142855

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