High-corrosion-resistance high-toughness FeCrNi system multi-principal-element alloy and preparation method thereof
A multi-principal alloy, high corrosion resistance technology, applied in the field of alloy materials, can solve the problems of composition segregation, coarse structure, complex phase structure, etc., and achieve the effect of uniform structure, fine grain and low price
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Embodiment 1
[0055] Embodiment 1 (hot extrusion rapid densification forming)
[0056] FeCrNi multi-principal element alloy powder (FeCrNi) was prepared by gas atomization 33.33 Cr 33.33 Ni 33.33 (at.%)), select the alloy powder with a particle size of about 30-100 microns through mechanical vibration screening, and put the alloy powder into a 45# steel ladle (the size of the sheath: outer diameter 85mm, inner diameter 50mm, height 150mm) , and shake it tightly, and then carry out pumping and sealing treatment on the sheath, the pumping temperature is 500°C, and the pumping time is 12 hours.
[0057] Sheath extrusion process parameters: heat up to 1150°C at a rate of 50°C / min, hold for 60 minutes and then extrude. The extrusion temperature is 1150°C, the extrusion ratio is 7:1, and the extrusion process time is less than 1min. The extruded billet was cooled at a cooling rate of 50° C. / min, and then the sheath was removed by mechanical means to obtain the final desired FeCrNi-based multi-...
Embodiment 2
[0059] Embodiment 2 (selective laser melting rapid prototyping)
[0060] FeCrNi multi-principal element alloy powder (FeCrNi) was prepared by gas atomization 33.33 Cr 33.33 Ni 33.33 (at.%)), the alloy powder with a particle size of 15-50 microns was selected by mechanical vibration sieving, the alloy powder was put into a vacuum drying oven and dried for 12 hours, and then the FeCrNi multi-principal alloy powder was laid layer by layer on the laser On the substrate of the selective melting forming device, laser scanning is performed layer by layer according to the three-dimensional model, melting, solidification and forming, and the process parameters of selective laser melting: the preheating temperature of the substrate is 100°C, the protective atmosphere is argon, the laser power is 350W, and the scanning speed is 1200mm / s, the layer thickness is 0.05mm, the scanning distance is 0.11mm, the cooling rate of the molten pool is about 10 6 K / s, the billets formed by selectiv...
Embodiment 3
[0062] Embodiment 3 (hot isostatic pressing densification forming)
[0063] FeCrNi multi-principal element alloy powder (FeCrNi) was prepared by gas atomization 33.33 Cr 33.33 Ni 33.33 (at.%)), select the alloy powder with a particle size of about 30-100 microns through mechanical vibration screening, and put the alloy powder into a 45# steel ladle (the size of the sheath: outer diameter 100mm, inner diameter 80mm, height 150mm) , and shake it tightly, and then carry out pumping and sealing treatment on the sheath, the pumping temperature is 500°C, and the pumping time is 12 hours.
[0064] Hot isostatic pressing process parameters: heat up to 1150 °C at a rate of 5 °C / min, hot isostatic pressing temperature is 1150 °C, hot isostatic pressing time is 2 hours, hot isostatic pressing pressure is 150 MPa, after hot isostatic pressing The billet is cooled to room temperature with the furnace. Subsequently, the sheath is removed by mechanical means to obtain the final desired F...
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