Single-phase high-manganese steel material with composite layered structure and preparation technology thereof
A preparation process and high-manganese steel technology, which are applied in the field of single-phase high-manganese steel materials and their preparation processes, can solve the problems of poor structural regularity of single-phase high-manganese steel materials, poor balance between strength and plasticity, and the like. Large-scale production, intensification of large constraint effects, and easy-to-achieve effects
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Embodiment 1
[0034] The composition of the single-phase high manganese steel material described in this embodiment is calculated by weight percentage: Mn 30.5%, C 0.11%, S≤0.01%, P≤0.008%, the rest is Fe and unavoidable impurities, wherein sulfur, The phosphorus content is a limiting content. There are nanocrystalline layer and recrystallized layer in the structure of single-phase high manganese steel material, see attached figure 2 with image 3 , figure 2 It is the metallographic diagram of high manganese steel after smelting, forging and 90% cold rolling. The white part in the metallographic diagram is the nanocrystalline layer, and the black part is the recrystallization layer; image 3 It is the EBSD diagram, the white part in the EBSD diagram is the recrystallization layer, the black part is the nanocrystalline layer, and the interlayer distance between the nanocrystalline layer and the recrystallization layer is about 10 μm.
[0035] In this embodiment, the preparation process ...
Embodiment 2
[0043] The process step of this embodiment is with reference to Example 1, and the difference is:
[0044] In the step (3), prior to the cold rolling of the raw board, the iron oxide scales of 1.0mm on the upper and lower surfaces are removed in advance;
[0045] The condition of step (4) annealing and forming is annealing at 550°C for 6h.
[0046] The metallographic diagram of the obtained single-phase high manganese steel material with composite layered structure is shown in the attached Figure 4 As shown, the results show that the single-phase high manganese steel material after annealing at 550°C for 6 hours forms a layered structure consisting of nanocrystalline layers and recrystallized layers alternately distributed. The measurement found that the interlayer distance between the nanocrystalline layer and the recrystallized layer is 9 μm; the volume percentage of the nanocrystalline layer in the structure of the single-phase high manganese steel material is about 10%. ...
Embodiment 3
[0048] (1) High manganese steel smelting: according to the design requirements Mn 32.0%, C 0.08%, S≤0.01%, P≤0.008%, the rest is Fe and unavoidable impurities, calculate the feeding ratio, and feed to the power frequency electric induction furnace, For smelting, the furnace is in argon positive pressure environment to prevent Mn from volatilizing during the smelting process and smelting into steel ingots;
[0049] (2) Forging raw board: heat the obtained steel ingot to 900°C~1000°C, and forge it into a rough board with a thickness of 20mm;
[0050] (3) Cold-rolled thin plate: place the rough plate at room temperature, remove 0.8 mm of iron oxide scale on its upper and lower surfaces, and then cold-roll it through 10-20 passes to a cold-rolled thin plate with a thickness of 2 mm. For the metallographic diagram, see the attached figure 2 As shown; where the cold rolling deformation is 90%, the controlled rolling rate is 0.4m / s, the reduction of each pass is 0.9mm, and the reduc...
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Abstract
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