A printing and post-processing method for laser additive manufacturing of 40crni2si2mova alloy steel
A laser additive and alloy steel technology, applied in the field of additive manufacturing, can solve the problems of unnecessary mass production, waste of resources, complex structure, etc., and achieve the effect of reducing research and development costs, improving mechanical properties, and improving internal organizational structure.
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Embodiment 1
[0023] The printing and post-processing method for laser additive manufacturing of 40CrNi2Si2MoVA alloy steel in the present invention includes the following steps:
[0024] Printing process steps: Selected laser melting (SLM) equipment is used, the scanning speed is set to 1000mm / s, the printing power is 150W, the powder diameter is 15-53 μm, and the printing layer thickness is 25 μm to print.
[0025] The first heat treatment step: normalizing at 950°C for 2 hours, furnace cooling to 600°C for atmospheric air cooling to room temperature; then annealing at 670°C for 5 hours, furnace cooling to 400°C for atmospheric air cooling to room temperature.
[0026] Hot isostatic pressing step: determine the hot isostatic pressing process according to the phase transition temperature of the alloy steel and the density of the deposited state, sample size, and microstructure. When selecting the hot isostatic pressing temperature, according to the phase transition point of the alloy steel ...
Embodiment 2
[0032] The printing and post-processing method for laser additive manufacturing of 40CrNi2Si2MoVA alloy steel in the present invention includes the following steps:
[0033] Printing process steps: Use selective laser melting (SLM) equipment, set the scanning speed to 800mm / s, the printing power to 120W, the powder diameter to be 15-53 μm, and the printing layer thickness to be 20 μm to print.
[0034] The first heat treatment step: normalizing at 950°C for 2 hours, furnace cooling to 650°C for atmospheric air cooling to room temperature; annealing at 700°C for 5 hours, furnace cooling to 400°C for atmospheric air cooling to room temperature.
[0035] Hot isostatic pressing step: under the pressure of 120MPa, the printed sample after the first heat treatment was kept at 1100°C for 4 hours, then cooled to 400°C at 20°C / min, and then air-cooled to room temperature with depressurization;
[0036] After testing, the density of the product obtained in the hot isostatic pressing ste...
Embodiment 3
[0040] The printing and post-processing method for laser additive manufacturing of 40CrNi2Si2MoVA alloy steel in the present invention includes the following steps:
[0041] Printing process steps: Use selective laser melting (SLM) equipment, set the scanning speed to 1200mm / s, the printing power to 150W, the powder diameter to be 15-53 μm, and the printing layer thickness to be 15 μm to print.
[0042]The first heat treatment step: normalizing at 950°C for 2 hours, furnace cooling to 550°C for atmospheric air cooling to room temperature; annealing at 650°C for 5 hours, furnace cooling to 350°C for atmospheric air cooling to room temperature.
[0043] Hot isostatic pressing step: under the pressure of 120MPa, the printed sample after the first heat treatment was kept at 1000°C for 4 hours, then cooled to 300°C at 20°C / min, and then air-cooled to room temperature with depressurization;
[0044] After testing, the density of the product obtained in the hot isostatic pressing ste...
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