High product of strength and elongation alloy steel in columnar crystal/isometric crystal composite crystal structure and preparation method thereof
A composite crystal and high-strength plastic product technology, which is applied in the field of microstructure and performance control of high-strength plastic product alloy steel, can solve problems such as inability to achieve strength and plasticity, and limited control range, so as to increase strength, improve axial plasticity, and high-strength Plasticizing effect
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[0021] Example: a high-strength plastic alloy steel with a columnar crystal / equiaxed crystal composite crystal structure, its main chemical composition is (wt%): Mn29.5, Al2.75, Si3.10, C0.05, and the rest is Fe.
[0022] The preparation method is as follows:
[0023] (1) Dosing according to the target ingredients, smelting in a vacuum induction furnace under the protection of argon, and pouring into ingots after smelting;
[0024] (2) The amount of turning on the surface of the steel ingot is 2mm, and the size of the forging billet is 40×40×600mm;
[0025] (3) Melt the processed billet in a directional solidification furnace under argon protection, the melting temperature is 1500°C, the crucible descending speed is 2mm / min during directional solidification, and the temperature gradient in the solidification area is 30°C / cm;
[0026] (4) Cut the directionally solidified billet into plates with a size of 40×10×500mm, and then carry out drawing deformation along the columnar cr...
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