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A kind of underwater quenching method of thin steel plate

A thin steel plate, laser quenching technology, applied in the direction of furnace, furnace type, heat treatment equipment, etc., can solve the problem of limited heat transfer effect of water on the matrix, and achieve the effect of reducing absorption

Active Publication Date: 2022-06-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods rely on the heat conduction effect of water on the substrate, but in fact the upper surface of the laser quenching processing area is not in direct contact with the cooling water, and the heat transfer effect of water on the substrate is very limited

Method used

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  • A kind of underwater quenching method of thin steel plate
  • A kind of underwater quenching method of thin steel plate
  • A kind of underwater quenching method of thin steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The base material used for underwater laser quenching is 45# steel, which is machined into a metal sample of 100 × 50 × 3 mm, and the surface is cleaned with anhydrous ethanol solution after degreasing, rust removal, and polishing. Two brackets were placed at the bottom of the water tank as supports, and the metal samples were placed on the brackets to avoid direct contact between the metal samples and the bottom of the water tank. By adding an appropriate amount of deionized water into the water tank, the upper surface of the metal sample has a certain thickness of the water layer.

[0025] In this embodiment, the thickness of the water layer is controlled to be 2mm, the water flow direction is orthogonal to the laser scanning direction, the water flow speed is 0.1m / s, the original water temperature is 20°C, and the side blowing device is placed horizontally. Adjust the laser power to 500W; the scanning speed is 2mm / s; the flow rate of the side blowing device is 50L / mi...

Embodiment 2

[0028] In this example, the laser power in Example 1 is increased to 800W, and other process parameters are guaranteed to be consistent with Example 1, and the cross-sectional view of the hardened layer of the sample is obtained ( figure 2 shown), compare figure 1 It can be found that the width of the quenching layer and the depth of the quenching layer increase significantly when the laser power increases.

Embodiment 3

[0030] In this example, the thickness of the water layer in Example 2 is increased to 8mm, and other process parameters are guaranteed to be consistent with Example 2, and the cross-sectional view of the hardened layer of the sample is obtained ( image 3 shown), compare figure 2 It can be known that the thickness of the quenching layer and the width of the quenching layer are significantly reduced when the water layer is too thick.

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Abstract

An underwater quenching method for a thin steel plate, the method comprising: polishing, cleaning, and decontaminating the surface of a substrate; placing the pretreated substrate in a water tank, and completely submerging the upper surface of the substrate in water, and using a wavelength The blue / green laser with a range of 400-600nm scans the surface of the substrate, and at the same time, a side blowing device is used to blow off the water vapor generated in the laser quenching process in time; The rapid rise of the temperature of the workpiece makes the surface temperature of the material rise above the austenite transformation temperature. The heat of the processed part of the thin steel plate is absorbed by the water layer on the upper surface of the thin steel plate. The cooling water absorbs the heat and vaporizes violently, taking away a large amount of heat. The thin steel plate is cooled rapidly, so as to meet the requirements of the thin steel plate to be hard on the outside and tough on the inside, and at the same time reduce the thermal influence on the base part.

Description

technical field [0001] The invention relates to an underwater quenching method of a thin steel plate. Background technique [0002] Laser phase transformation hardening is the most widely used technology in laser heat treatment. When irradiating the part, due to the effect of heat conduction, the matrix in the cold state rapidly cools the irradiated part and performs self-cooling quenching, obtaining a finer hardened layer structure and realizing the transformation hardening of the surface layer of the material. The self-cooling of workpiece parts depends on the heat conduction of the base part, but for thin-walled parts, the base part is thinner and less, and in the process of laser quenching, it is often hardened or even melted through the steel plate, and the unprocessed area is very bad. Large heat-affected zone that affects the performance of other parts of the substrate. Therefore, simply relying on traditional quenching or laser quenching is difficult to maintain th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/46C21D1/09
Inventor 王梁贺定坤姚建华张群莉
Owner ZHEJIANG UNIV OF TECH
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