Method for enhancing strength of low-carbon and medium-carbon steel through nano carbide precipitation
A cementite and low carbon steel technology, applied in the field of metallurgy, can solve the problem that the strengthening effect is not very obvious, and achieve the effect of improving the strength
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Embodiment 1
[0026] The thickness of the carbon steel slab used is 70mm, and the composition is C 0.17%, Si 0.19%, Mn 0.7%, P 0.002%, S0.002% by weight percentage, and the balance is iron;
[0027] Heat the carbon steel slab to 1200°C and keep it warm for 1h;
[0028] The heated carbon steel slab is hot-rolled at 1100°C with a rolling mill, the cumulative reduction is 90%, and the final rolling temperature is 890°C to obtain a hot-rolled slab;
[0029] The hot-rolled slab is water-cooled to 500°C at a rate of 100-120°C / s by using an ultra-rapid cooling method;
[0030] Using a rolling mill, the water-cooled hot-rolled slab is subjected to single-pass plastic deformation at 500°C, with a deformation of 7%, and then kept at 500°C for 60 minutes, and then air-cooled to room temperature to obtain high-strength carbon steel. Its structure is uniform lath bainite, and its morphology is as follows: Figure 4 As shown, the volume fraction of nano-cementite particles reaches 10%; nano-cementite p...
Embodiment 2
[0034] The thickness of the carbon steel slab used is 80mm, and the composition is C 0.19%, Si 0.3%, Mn 0.7%, P 0.002%, S0.004% by weight percentage, and the balance is iron;
[0035] Heat the carbon steel slab to 1200°C and keep it warm for 1h;
[0036] The heated carbon steel slab is hot-rolled at 1100°C with a rolling mill, the cumulative reduction is 90%, and the final rolling temperature is 890°C to obtain a hot-rolled slab;
[0037] The hot-rolled slab is water-cooled to 450°C at a rate of 100-120°C / s by means of ultra-rapid cooling;
[0038]Using a rolling mill, the water-cooled hot-rolled slab is subjected to single-pass plastic deformation at 450°C, with a deformation of 6%, and then kept at 500°C for 20 minutes, and then air-cooled to room temperature to obtain high-strength carbon steel. Its structure is bainite, and dispersed nano-scale cementite particles are precipitated in the structure of the material, with a particle size of 5-30nm; the yield strength of high...
Embodiment 3
[0040] The thickness of the carbon steel slab used is 40mm, and the composition is C 0.15%, Si 0.23%, Mn 0.7%, P 0.003%, S0.002% by weight percentage, and the balance is iron;
[0041] Heat the carbon steel slab to 1200°C and keep it warm for 1h;
[0042] The heated carbon steel slab is hot-rolled at 1100°C with a rolling mill, the cumulative reduction is 90%, and the final rolling temperature is 880°C to obtain a hot-rolled slab;
[0043] Using ultra-rapid cooling method, the hot-rolled slab is water-cooled to 600°C at a speed of 150-200°C / s;
[0044] Using a rolling mill, the water-cooled hot-rolled slab is subjected to single-pass plastic deformation at 600°C, with a deformation of 7%, and then kept at 600°C for 20 minutes, and then air-cooled to room temperature to obtain high-strength carbon steel. It is mainly a degenerated pearlite structure, in which dispersed nano-scale cementite particles are precipitated, and the particle size of the cementite particles is 5-50nm; ...
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