3D printed high carbon content steel and method of preparing the same
A 3D printing, carbon content technology, applied in other manufacturing equipment/tools, improvement of process efficiency, manufacturing tools, etc., can solve time-consuming and other problems
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Embodiment 1
[0140] Separate HIP and hardening and combined HIP and hardening for 3D printing high-alloy materials were compared using a Quintus QIH 21URQ machine, the composition of which is shown in Table 1. Four 3D printed Fe alloys, three high-speed steel types and one martensitic stainless steel type were compared. 3D printing was performed essentially as described in WO2018 / 169477, which is incorporated herein by reference. All four material types were first conventionally consolidated by HIP, hardening and tempering in a conventional manner. Then, samples from the exact same 3D printing batch were processed through a new combined HIP, hardening and tempering process, where the hardening and annealing time and temperature settings were the same as conventional. See Table 1.
[0141] Table 1. 3D printing materials tested
[0142]
[0143] Conventional HIP parameters are heating to 1120°C-1150°C, holding time at HIP pressure of 100MPa for 3h, then cooling to room temperature, and...
Embodiment 2
[0168] A series of tests were carried out on the samples to see how the method of the invention affects toughness (impact resistance) compared to conventional HIP and heat treatment.
[0169] Toughness measurements were carried out with 3D printed Charpy rods in horizontal and vertical directions, 10pcs in each direction. After the different test heat treatments, the bars were ground to the final test bar measurements, L x W x H = 7 x 10 x 55, + / - 0.025mm. The surface roughness is determined by the final surface grinding step, grit 4000. Notches are not used on test rods. Toughness was then measured in a 300J Charpy tester with egg radius 2mm at room temperature. Toughness results are expressed as an average of 10 samples in joules.
[0170] Table 4. Hardness and toughness of alloys of the invention and samples treated according to conventional HIP and heat treatment. Values are given for horizontally lying test specimens / vertical standing test specimens, which correspon...
Embodiment 3
[0179] Printing trials of alloy M42 are compared here between two heat treatment methods: conventional 3h HIP plus hardening + annealing 3 x 560°C at 1180°C in a separate vacuum furnace; and combined HIP according to the invention and heat treatment, using the same temperature and time settings as the conventional method above, but with different pressures.
[0180] The powder used is gas-atomized, the size fraction is 53 μm-150 μm, and its composition is in % by weight according to the instructions:
[0181] C Cr Mo W co V 1.08 3.8 9.4 1.5 8.0 1.2
[0182] M42 is a very high Mo steel, usually a traditional non-PM high speed steel material, conforming to the standard HS2-9-1-8, AISISM42 or EN 1.3247.
[0183] Combined HIP and heat treatment were performed as described above under these conditions:
[0184] 3h HIP at 1120 °C and 1000 bar
[0185] Increase the temperature to 1180°C
[0186] quenching / hardening
[0187] Annealing at 560 °C, appro...
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