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An on-line detection device for the structure change of metal melt caused by ultrasonic pretreatment

A technology of ultrasonic pretreatment and metal melt, applied in the field of material science, can solve the problems of long test period, discontinuity, hysteresis of pretreatment effect, etc., to facilitate insertion and withdrawal, ensure temperature consistency, and improve repeatability Effect

Active Publication Date: 2016-08-17
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that there is hysteresis and discontinuity in the investigation of the pretreatment effect, that is, the test period is long, and it is impossible to conduct a full inspection of the pretreatment process
However, due to the mutual interference between the alternating magnetic field used for detection and the ultrasound and its mechanism, the indirect method cannot realize the accurate detection of the resistance change of the metal melt caused by the ultrasound, and the introduction of the ultrasound in the metal melt often uses a metal ultrasonic rod. The electrode method cannot rule out the interference caused by the conduction of the ultrasonic rod

Method used

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  • An on-line detection device for the structure change of metal melt caused by ultrasonic pretreatment
  • An on-line detection device for the structure change of metal melt caused by ultrasonic pretreatment
  • An on-line detection device for the structure change of metal melt caused by ultrasonic pretreatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] (1) Insert the measuring electrode into the electrode insertion hole along the reserved hole on the upper cover of the resistance heating and holding furnace until the electrode touches the bottom of the electrode insertion hole and fix it, and connect the detection circuit;

[0075] Insert the temperature measuring thermocouple from the insertion hole of the ultrasonic horn into the center of the horizontal hole and fix it;

[0076] Insert the ultrasonic amplitude-changing introduction rod into the metal melt storage unit through the insertion hole of the ultrasonic amplitude-changing introduction rod, and place it above the horizontally arranged circular hole;

[0077] Preheat the resistance heating holding furnace to the melting temperature of Pb-20wt.%Sn, open the upper cover of the holding furnace, pour the alloy melt preheated to 150°C above the liquidus line into the metal melt storage unit until the metal When the melt level reaches 10mm from the upper opening o...

Embodiment 2

[0082] (1) Insert the measuring electrode into the electrode insertion hole along the reserved hole on the upper cover of the resistance heating and holding furnace until the electrode touches the bottom of the electrode insertion hole and fix it, and connect the detection circuit;

[0083] Insert the temperature measuring thermocouple from the insertion hole of the ultrasonic horn into the center of the horizontal hole and fix it;

[0084] Insert the ultrasonic horn into the melt storage unit through the insertion hole of the ultrasonic horn, and place it above the horizontal hole;

[0085] Preheat the resistance heating holding furnace to the melting temperature of Pb-20wt.%Sn, open the upper cover of the holding furnace, and pour the alloy melt preheated to 150°C above the liquidus line into the metal melt storage unit until the metal When the melt level reaches 10mm from the upper opening of the storage unit, cover the furnace cover again;

[0086] (2) Turn on the compute...

Embodiment 3

[0090] (1) Insert the measuring electrode into the electrode insertion hole along the reserved hole on the upper cover of the resistance heating and holding furnace until the electrode touches the bottom of the electrode insertion hole and fix it, and connect the detection circuit;

[0091] Insert the temperature measuring thermocouple from the insertion hole of the ultrasonic horn into the center of the horizontal hole and fix it;

[0092] Insert the ultrasonic amplitude-changing introduction rod into the metal melt storage unit through the insertion hole of the ultrasonic amplitude-changing introduction rod, and place it above the horizontally arranged circular hole;

[0093] Preheat the resistance heating holding furnace to the melting temperature of Pb-20wt.%Sn, open the upper cover of the holding furnace, pour the alloy melt preheated to 150°C above the liquidus line into the metal melt storage unit until the metal When the melt level reaches 10mm from the upper opening o...

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Abstract

The invention belongs to the field of materials science and technology, and specifically relates to an online detection device for structural changes in metal melt caused by ultrasonic pretreatment. The detection device of the present invention consists of a heating insulation system, a metal melt storage unit, a power ultrasonic system, a melt resistance or resistivity detection system, a melt temperature signal acquisition system, a data acquisition and processing system, and the like. The device of the present invention can detect and utilize the structurally sensitive physical parameter - the change amount Δr of the resistance parameter to characterize the structural change of the metal melt caused by ultrasound. It successfully solves the insulation problem of the power ultrasonic introduction rod and overcomes the problem of using voltammetry. The influence of the ultrasonic rod when measuring the resistance of ultrasonic-induced metal melt, and using advanced electronic measurement technology and computer technology to achieve real-time, synchronous, continuous and high-precision automatic collection and processing of resistance and temperature data, and using the two-electrode method and four-electrode method All methods can achieve accurate measurement.

Description

technical field [0001] The invention belongs to the technical field of material science, and in particular relates to an on-line detection device for the structure change of metal melt caused by ultrasonic pretreatment. Background technique [0002] The key to controlling the solidification behavior is to control the nucleation process of the metal melt. All methods that can increase the nucleation rate can achieve the refinement of the solidification structure. Melt pretreatment can change the melt structure and increase the nucleation rate, so it is a common method to achieve as-cast microstructure refinement. External field pretreatment refinement of metal melt is a process method to promote homogeneous nucleation to achieve refinement. One of its mechanisms is to increase the nucleation rate by changing the dynamic fluctuation equilibrium state of the melt structure, that is, the application of an external field The short-range ordered structure of the metal melt is ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/04
Inventor 乐启炽张建锋刘轩胡文义张志强崔建忠
Owner NORTHEASTERN UNIV LIAONING
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