Composite preparation method of high-strength D6A fine grain steel
A high-strength, fine-grained technology, applied in the field of materials, can solve problems such as the degree of grain refinement is not obvious, and achieve the effects of excellent comprehensive mechanical properties, low content of alloy elements, and high plasticity
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Embodiment 1
[0043] A composite preparation method of high-strength D6A fine-grained steel, the technological process is as follows figure 1 shown, follow the steps below:
[0044] The molten steel is smelted according to the composition of D6A steel under the condition of protective atmosphere, and its composition by mass percentage is C: 0.43%, Si: 0.17%, Mn: 0.73%, P: 0.012%, Mo: 1.01%, Cr: 1.05%, Ni : 0.004%, V: 0.09%, N: 0.004%, Al: 0.03%, S: 0.004%, and the balance is Fe and unavoidable impurities. And cast into an ingot with a diameter of 100mm with original coarse grains; the microstructure of the ingot is ferrite and pearlite (see Figure 4 ), the grain size is about 34μm, the yield strength is 560±10MPa, the tensile strength is 868±10MPa, and the elongation is 20±0.5%. ( image 3 pentagon curve)
[0045] At room temperature, the ingot with a diameter of 100mm with original coarse grains is continuously rotary forged at room temperature along the radial direction.
[0046] T...
Embodiment 2
[0050] A composite preparation method of high-strength D6A fine-grained steel is specifically carried out according to the following steps:
[0051] The molten steel is smelted according to the composition of D6A steel under the condition of protective atmosphere, and its composition by mass percentage is C: 0.43%, Si: 0.17%, Mn: 0.73%, P: 0.012%, Mo: 1.01%, Cr: 1.05%, Ni : 0.004%, V: 0.09%, N: 0.004%, Al: 0.03%, S: 0.004%, and the balance is Fe and unavoidable impurities. And cast into an ingot with a diameter of 100mm with original coarse grains; the microstructure of the ingot is ferrite and pearlite, the grain size is about 34μm, the yield strength is 560±10MPa, the tensile strength is 868±10MPa, and the elongation is is 20±0.5%.
[0052] At room temperature, the ingot with a diameter of 100mm with original coarse grains is continuously rotary forged at room temperature along the radial direction.
[0053] The forgings with a diameter of 50mm were kept at 900±20°C for 35...
Embodiment 3
[0057] A composite preparation method of high-strength D6A fine-grained steel is specifically carried out according to the following steps:
[0058] The molten steel is smelted according to the composition of D6A steel under the condition of protective atmosphere, and its composition by mass percentage is C: 0.43%, Si: 0.17%, Mn: 0.73%, P: 0.012%, Mo: 1.01%, Cr: 1.05%, Ni : 0.004%, V: 0.09%, N: 0.004%, Al: 0.03%, S: 0.004%, and the balance is Fe and unavoidable impurities. And cast into an ingot with original coarse grains; the microstructure of the ingot is ferrite and pearlite, the grain size is about 34μm, the yield strength is 560±10MPa, the tensile strength is 868±10MPa, and the elongation is 20± 0.5%.
[0059] At room temperature, the ingot with a diameter of 100mm with original coarse grains is continuously rotary forged at room temperature along the radial direction.
[0060] The forgings with a diameter of 50mm were kept at 900±20°C for 30min, and air-cooled to room...
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