Preparation method for rare-earth magnesium alloy large-size high-strength forged piece
A rare earth magnesium and large size technology is applied in the preparation of large size and high strength forgings of rare earth magnesium alloys and the field of forgings, and can solve the problem of low yield of large size rare earth magnesium alloy forgings, limited strength of large size rare earth magnesium alloy forgings, unsatisfactory room temperature tensile strength and other issues, to achieve the effect of improving the plasticity of the hot working process, refining the as-cast microstructure, and reducing the probability of cracking
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[0029] Such as figure 1 Shown is the flow chart of the first embodiment of the preparation method in the present invention; figure 1 As can be seen, the preparation method of the present invention comprises:
[0030] Step 101 of obtaining a rare earth magnesium alloy ingot by smelting and casting, the rare earth magnesium alloy includes three alloying elements Gd, Y, and Zr; the preferred value of the mass percentage of each element in the rare earth magnesium alloy is: Gd: 7.5-9.5%, Y: 3.5-5.0%, Zr: 0.3-0.6%, impurity ≤ 0.13%, the balance being Mg.
[0031] The concrete steps of described smelting and casting are:
[0032] (1) Melt the Mg ingot in the melting furnace, and the melting process uses SO 2 +SF 6 gas protection;
[0033] (2) After heating up, add Mg-Gd, Mg-Y, Mg-Zr intermediate alloy prepared in proportion, and use electromagnetic force to stir the alloy melt during the alloying process to ensure the uniform distribution of alloying elements;
[0034] (3) Add...
Embodiment 1
[0054] The rare earth magnesium alloy used to prepare large-scale high-strength forgings, the mass percentage of each element is: Gd: 9.2%, Y: 3.7%, Zn: 1.4%, Zr: 0.5%, impurities ≤ 0.1%, and the balance of Mg. The preparation of large-scale high-strength forgings of rare earth magnesium alloys adopts the following steps:
[0055] 1. Melting and casting, specifically:
[0056] (1) Melt the high-purity Mg ingot in a smelting furnace, and the melting process uses SO 2 +SF 6 gas protection;
[0057] (2) Add high-purity Zn and Mg-Gd, Mg-Y, Mg-Zr intermediate alloys prepared in proportion when the temperature is raised to 650-670 ° C. The alloying process uses electromagnetic force to stir the alloy melt to ensure the alloying elements. Evenly distributed;
[0058] (3) Add refining agent when the temperature rises to 700-750°C, the amount of refining agent accounts for 1-2% of the total charge, and the refining time is 10-30 minutes;
[0059] (4) After refining, cool down to 6...
Embodiment 2
[0066] The rare earth magnesium alloy used to prepare large-scale high-strength forgings, the mass percentage of each element is: Gd: 8.7%, Y: 3.9%, Zn: 1.2%, Zr: 0.4%, impurities ≤ 0.11%, and the balance of Mg. The preparation of large-scale high-strength forgings of rare earth magnesium alloys adopts the following steps:
[0067] 1. Melting and casting, specifically:
[0068] (1) Melt the high-purity Mg ingot in a smelting furnace, and the melting process uses SO 2 +SF 6 gas protection;
[0069] (2) Add high-purity Zn and Mg-Gd, Mg-Y, Mg-Zr intermediate alloys prepared in proportion when the temperature is raised to 650-670 ° C. The alloying process uses electromagnetic force to stir the alloy melt to ensure the alloying elements. Evenly distributed;
[0070] (3) Add refining agent when the temperature rises to 700-750°C, the amount of refining agent accounts for 1-2% of the total charge, and the refining time is 10-30 minutes;
[0071] (4) After refining, cool down to ...
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