Bulk nano-structured low carbon steel and method of manufacturing the same
a low carbon steel and nano-structure technology, applied in the direction of nanotechnology, etc., can solve the problems that the majority of nano-materials manufactured by such methods are difficult to be practically applied in the industry, and achieve the effects of low production cost, reduced manufacturing cost and increased siz
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embodiment 1
[0045]The sample size is φ 22 mm×35 mm. Multiple times deformation treatment is performed at room temperature, the strain in each deformation is about 0.1-0.2, the accumulated strain is about 1.73. The treated sample size is Φ52.7 mm×6.5 mm. As shown in FIGS. 2 and 3, in SEM-ECC (Scanning Electron Microscopy-Electron Channel Contrast) and TEM (Transmission Electron Microscopy) cross-section observations, a microstructure composed of lamellar-shaped ferrite grains and deformed pearlite grains is presented. Obviously, after the above-mentioned treatment, the ferrite grain is changed into a lamellar shape and high-density dislocations are distributed inside the grain. The average dimension in the direction of the minor axis of the ferrite grain is 200 nm. As can be seen from the engineering stress-strain curve shown in FIG. 4, the tensile strength is 976 MPa and the elongation at break is 4.0%. As can be seen from the typical fatigue curve shown in FIG. 5, fatigue limit at 50% failure ...
embodiment 2
[0046]The sample size is Φ 10 mm×17 mm. Multiple times deformation treatment is performed at room temperature, the strain in each deformation is about 0.23, the accumulated strain is about 2.1. The treated sample size is Φ 31.2 mm×2 mm. In SEM-ECC and TEM cross-section observations, a microstructure composed of lamellar-shaped ferrite grains and deformed pearlite grains is presented. The Hardness testing shows that the average hardness is Vickers hardness HV271. The room temperature tensile testing shows that the tensile strength is 1014 MPa, and the elongation at break is 3.8%.
embodiment 3
[0047]The sample size is Φ 15 mm×20 mm. Multiple times deformation treatment is performed at room temperature, the strain in each deformation is about 0.1-0.2, the accumulated strain is about 1.4. The treated sample size is Φ 33.2 mm×5.0 mm. In SEM-ECC and TEM cross-section observations, a microstructure composed of lamellar-shaped ferrite grains and deformed pearlite grains is presented. The Hardness testing shows that the average hardness is Vickers hardness HV264. The room temperature tensile testing shows that the tensile strength is 978 MPa, and the elongation at break is 5.5%.
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