An_Investigation_Into_Fully_Melting_a_Maraging_Steel_Using_Direct_Metal_Laser_Sintering_(Dmls)

May 1st, 2015
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This paper reports on the relative capability of the EOS M250 Extended platform to fully melt an 18Ni (‘300’ grade) maraging tool steel from sub-20 µm powder. The work describes the investigation of scanning routines necessary to achieve satisfactory metallurgical integrity and shape manufacturing capabilities of the process.

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An Investigation Into Fully Melting a Maraging Steel Using Direct Metal Laser Sintering (Dmls)AN INVESTIGATION INTO FULLY MELTING A MARAGING STEEL USING DIRECT METAL LASER SINTERING (DMLS)Mark. Stanford, Kevin. Kibble, Matthew. Lindop, Diane. Mynors and Colin. DurnallDepartment of Engineering and TechnologyUniversity of WolverhamptonShifnal Road, PriorsleeTelford, UKTF2 9NTABSTRACTThis paper reports on the relative capability of the EOS M250 Extended platform to fully melt an 18Ni (300 grade) maraging tool steel from sub-20 m powder. The work describes the investigation of scanning routines necessary to achieve satisfactory metallurgical integrity and shape manufacturing capabilities of the process. Solidification was observed to take place by cellular and cellular-dendritic growth mechanisms in DMLS of the maraging steel. Intercellular spacing was less than 1 (m and this contributed to the excellent strength and hardness achieved for both as-sintered and aged material. Aging at 490(C for 6 h led to an increase in hardness and strength through the precipitation of Ni3(Mo,Ti) and Fe2Mo intermetallics. Ultimate tensile strength increased from 1101 to 1875 MPa, Vickers hardness increased from 387 to 603 kg/mm2 but elongation was reduced from 11.3 to 1.8% by aging the steel. These test results were within the tolerance specification for the material. The overall length of the test specimens was measured in the as-sintered and aged conditions. Uniformity

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