Preparation method for zirconium-niobium alloy having gradient microstructure
A technology of zirconium-niobium alloy and gradient structure, which is applied in the field of metal material preparation, can solve problems such as surface plasticity reduction, and achieve the effects of low cost, improved strength and safe production.
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Embodiment 1
[0022] The Zr-2.3Nb plate was firstly kept at 1000°C for 0.5h and then water quenched, and then kept at 600°C for 0.5h to obtain a basket-like structure, as figure 1 As shown, it can be seen from the figure that the surface structure of the Zr-2.3Nb plate is: the shortened α in the original β grain is a basket-like weaving structure, and the strip β phase is distributed at the grain boundary of the α phase. Cut out a 10mm thick thin plate, and after the surface is polished, use a pneumatic pick to impact the surface, the impact frequency is 15Hz, the impact energy is 50J, the impact is 5s, and the impact is performed on one side at 0°C. Then put the above treated sheet into a high temperature furnace with a temperature of 900° C., keep it warm for 60 minutes, take it out and cool it to room temperature in air. It is possible to obtain a graded texture material in which the surface layer ~1.5mm is equiaxed α phase + transformed β phase, the rest is rod-shaped α phase + transfor...
Embodiment 2
[0024] The Zr-2.3Nb plate was firstly incubated at 1020°C for 40 minutes and then water-quenched, and then held at 600°C for 1 hour to obtain a basket-like structure. Cut out a 10mm thick thin plate, and after the surface is polished, use a pneumatic pick to impact the surface, the impact frequency is 20Hz, the impact energy is 50J, the impact is 5s, and the impact is performed on one side at 15°C. Then put the above treated sheet into a high-temperature furnace with a temperature of 900° C., keep it warm for 40 minutes, take it out and cool it to room temperature in air. It is possible to obtain a graded structure material in which the shock surface is equiaxed α phase + transformed β phase structure 1.8 mm inward, and the rest is rod-shaped α phase + transformed β phase structure, and the volume fraction of α phase gradually increases from the impact surface to the bottom. Carry out the mechanical performance test, the tensile strength is 640MPa, and the elongation is 22.3%....
Embodiment 3
[0026] The Zr-2.3Nb plate was firstly incubated at 1030°C for 40 minutes and then quenched in water, and then held at 600°C for 1 hour to obtain a basket-like structure. Cut a 10mm thick sheet, and after the surface is polished, use a pneumatic pick to impact the surface with an impact frequency of 15Hz, impact energy of 80J, impact for 5s, and perform single-sided impact at 15°C. Then put the above-mentioned thin plate into a high-temperature furnace with a temperature of 850° C., keep it warm for 60 minutes, take it out and cool it to room temperature in air. It is possible to obtain a graded structure material in which the impact surface is equiaxed α phase + transformed β phase structure 2.5mm inward, and the rest is rod-shaped α phase + transformed β phase structure, and the volume fraction of α phase gradually increases from the impact surface to the bottom. Carry out the mechanical performance test, the tensile strength is 649MPa, and the elongation is 21.9%.
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