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Electric pulse casting and rolling method of semi-solid alloy

A semi-solid, electric pulse technology, applied in the field of casting and rolling forming of metal alloy materials, can solve the problems of low processing yield, high deformation resistance and high requirements

Inactive Publication Date: 2010-09-01
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The casting and rolling technology of liquid ferrous metals and high-temperature alloys is still immature. These alloys have high melting points, high deformation resistance, and high requirements for rolling equipment and rolls. The total heat capacity of liquid alloys is large, and the heating intensity for rolls is large. Large shrinkage, many defects, low processing yield

Method used

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  • Electric pulse casting and rolling method of semi-solid alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0010] Embodiment 1: AZ31B magnesium alloy

[0011] use as figure 1 In the vertical casting and rolling process shown, the diameter of the roll is 210mm, and the rolling speed is controlled by a frequency converter, and the casting and rolling speed is 0.8-1.0m min -1 , adjust the roll gap to 2mm, keep the temperature of the semi-solid slurry in the insulating crucible between 560 and 570°C, carry out casting and rolling, and cool it with water, the cooling rate is 550°C / S-600°C / S, and the frequency is 50Hz, the current When the duty ratio is 200A and the duty cycle is 10%, the magnesium alloy thin strip with neat edges and good surface quality can be obtained. The grain structure of the cast-rolled strip is equiaxed grain with fine texture, the grain size is not very uniform, and the average grain size It is 15μm-25μm, which greatly eliminates segregation, improves the plastic deformation ability of metal materials, and improves the comprehensive mechanical properties of mat...

Embodiment 2

[0012] Embodiment 2: 5754 aluminum alloy

[0013] Due to the poor fluidity of the 5754 aluminum alloy melt, such as figure 2 The vertical casting and rolling scheme, the roll diameter is 210mm, the roll gap is 3.0mm, the holding crucible temperature is 670-685°C, and the casting-rolling speed is 0.7-0.8m·min -1 , water cooling, cooling rate 600℃ / S~650℃ / S, when the frequency is 100Hz, the current is 400A, and the duty cycle is 20%, the tensile strength is 210~215N·mm -2 , The elongation rate is 24-26%, and the crystal grain is finer than ordinary casting and rolling. Composed of α-phase and β-phase, the β-phase is granular and strip-shaped, and the distribution, size, position and structure of the precipitated intermetallic compounds are microstructures with good deformability.

Embodiment 3

[0014] Embodiment 3: A356 aluminum alloy

[0015] Adopt the inclined casting and rolling scheme as shown in Figure 3, the diameter of the roll is 210mm, the roll gap is 3.0mm, the temperature of the molten pool is between 595~615℃, and the casting and rolling speed is 0.7~0.8m·min -1 , with cold water passed into the water-cooled hollow roll for cooling, the flow rate is controlled, the cooling rate is 580 ° C / S ~ 630 ° C / S, when the frequency is 180 Hz, the current is 600 A, and the duty ratio is 20%, a fine-grained structure is obtained. The grain size is 10-50 μm, and the performance test shows that the tensile strength reaches 280MPa, and the elongation is 20%.

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Abstract

The invention relates to an electric pulse casting and rolling method of a semi-solid alloy. In the method, semi-solid alloy slurry is filled between two rollers rotating in reverse directions, and is subject to flash set and plastic deformation under the action of pulse currents, thus obtaining alloy plates, thin alloy materials, alloy bars or alloy wires. The method can remarkably eliminate the segregation, refines the grains, and enhances the plastic deformation capability of the metal material, thereby improving the comprehensive mechanical properties of the material.

Description

technical field [0001] The invention relates to the field of casting and rolling forming of metal alloy materials, especially the electric pulse rolling method of semi-solid alloys Background technique [0002] Casting and rolling technology is a short-process and energy-saving technology in the field of metallurgy and material processing. It integrates casting forming and rolling deformation technology of alloys, and directly "casts and rolls" molten metal into strip blanks. The semi-solid casting and rolling process is a method in which the alloy is fed into the roll room in a semi-solid state for solidification and rolling. At present, the research on semi-solid casting and rolling technology mainly focuses on aluminum alloy and steel materials, and more studies are on semi-solid vertical twin-roll casting and rolling. For the first time in the world, H.Watari et al. proposed a semi-solid twin-roll casting and rolling process for magnesium alloy thin plates, and used mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/02
Inventor 阎峰云黄晓锋黄旺马颖程从德杨群英
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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