A Cyclic Torsion Process for Improving the Mechanical Properties of Metal Materials
A technology of metal materials and processing technology, applied in the field of cyclic torsion processing technology, can solve the problems of limited strength, mechanical instability, complex equipment, etc., and achieve high yield strength and tensile strength, uniform plasticity and elongation at break, good Effect of Strength and Plasticity Matching
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Embodiment 1
[0034] In this embodiment, 304 austenitic stainless steel rods are subjected to small-angle cyclic reciprocating torsional deformation treatment.
[0035] Fix one end of the coarse-grained 304 austenitic stainless steel sample, and apply cyclic torsional deformation to the other end (such as figure 1 Shown), the gradient structure 304#1 sample was obtained.
[0036] The process parameters of the gradient structure 304#1 sample are selected as follows: the diameter of 304 austenitic stainless steel is 6 mm, the torsion angle amplitude is 5 degrees, the torsion speed is 5000° / min, the torsion cycle is 200 cycles, and the torsion time is about 14 seconds. The temperature is room temperature 25 degrees.
[0037] As the depth from the surface increases, the degree of deformation in the material presents a monotonically decreasing trend, forming a gradient distribution of deformation microstructure ( figure 2 ). However, the microstructure is still austenite and no martensite ph...
Embodiment 2
[0040] In this embodiment, a cyclic torsional deformation treatment is applied to the coarse-grained 304 austenitic stainless steel #2 sample to obtain a 304 #2 sample with a gradient structure.
[0041] The difference from Example 1 is that the process parameters of the gradient structure 304#2 sample are selected as follows: the diameter of 304 austenitic stainless steel is 6 mm, the torsion angle amplitude is 15 degrees, the torsion speed is 5000 ° / min, and the torsion cycle is 200 cycles , the torsion time is about 6 minutes, and the torsion temperature is 25 degrees at room temperature.
[0042] As the depth from the surface increases, the degree of deformation in the material presents a monotonically decreasing trend, forming a gradient distribution of deformation microstructure ( figure 2 ). The outermost surface is still coarse-grained ( Figure 4 ), there are high-density dislocations distributed inside the coarse grain, a large number of dislocation cells and disl...
Embodiment 3
[0046] This example is for coarse-grained Al 0.1 CoCrFeNi high-entropy alloy samples subjected to cyclic torsional deformation treatment.
[0047] The process parameters of gradient structure high-entropy alloy #1 sample are selected as follows: Al 0.1 The diameter of the CoCrFeNi high-entropy alloy sample is 4.5 mm, the torsion angle amplitude is 4 degrees, the torsion speed is 120° / s, the torsion cycle is 200 cycles, the torsion time is 14 seconds, and the torsion temperature is 25 degrees at room temperature.
[0048] In the present embodiment, gradient structure high-entropy alloy #1 is subjected to uniaxial tensile test at room temperature, and the engineering stress-strain curve is as follows Figure 10 As shown, the uniaxial tensile yield strength is 291MPa, the tensile strength is 488MPa, about 2.1 and 1.1 times of the coarse grain structure, its uniform elongation is 50.5%, and the fracture elongation is 70.6%, which is equivalent to the coarse grain structure.
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Abstract
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