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High-hardness material surface treatment method and device

A surface treatment, high hardness technology, applied in the field of material processing, can solve the problems of unsatisfactory effect, low plastic deformation ability, limited effect, etc., and achieve the effects of good residual stress elimination effect, fatigue resistance improvement, and good processing effect

Active Publication Date: 2015-08-26
WUHAN HIVALUE INTELASER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively high hardness and relatively low plastic deformation capacity of the material at room temperature, the effect of ultrasonic shock is limited
Especially for materials with high hardness (>55HRC) such as metal compound-based composite materials and metal-ceramic composite materials, the effect of ultrasonic impact treatment at room temperature is not ideal

Method used

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  • High-hardness material surface treatment method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] as attached figure 1 As shown, after the 16Mn steel plate is welded, induction-assisted ultrasonic shock is used to treat the weld seam and heat affected zone (Heat Affected Zone, HAZ) to eliminate welding stress. After treatment, the peak residual compressive stress ~300MPa is formed on the surface of the weld, and the depth of the compressive stress layer is ~1.5mm. The microstructure of weld seam and HAZ area is obviously refined, and the fatigue strength of weld seam is increased by 30-40%.

[0042] Implementation steps:

[0043] ① Fix the welded 16Mn steel plate at a specific position;

[0044] ②Clamp the induction coil on the manipulator, the heating surface of the induction coil is parallel to the surface to be impacted by the 16Mn steel plate, and the gap between the two planes is 3mm;

[0045] ③The infrared thermometer aims at the induction heating area on the steel plate. The infrared thermometer is connected with the temperature controller and the inducti...

Embodiment 2

[0049] Such as figure 2 As shown, the circular weld of stainless steel pipe 1Cr18Ni9Ti, in order to eliminate the welding residual stress and improve the resistance to stress corrosion cracking, induction-assisted ultrasonic shock is used to treat the circular weld. After treatment, the peak residual compressive stress ~ 350MPa is formed on the surface of the girth weld, and the depth of the compressive stress layer is ~ 1.8mm. The structure of the weld and HAZ area is obviously refined, and the stress corrosion cracking resistance of the weld is increased by 40-50% compared with that before treatment.

[0050] Implementation steps:

[0051] ① Install the welded stainless steel pipe 1Cr18Ni9Ti on the CNC machine tool;

[0052] ②Clamp the induction coil on the spindle of the CNC machine tool, and the gap between the induction coil and the stainless steel pipe is 5mm;

[0053] ③The infrared thermometer is aimed at the induction heating area on the stainless steel tube. The ...

Embodiment 3

[0057] as attached image 3 As shown, the plasma arc surfacing welding stellite-1 superalloy layer on the 45 steel flat substrate. The surfacing layer is processed by induction-assisted ultrasonic shock. After impact treatment, the residual tensile stress on the surface of the coating is completely eliminated, and a compressive stress layer with a peak stress of 200MPa is formed. The depth of the compressive stress layer is 0.8mm. There is no cracking phenomenon on the surface of the surfacing layer, and the sliding wear performance at room temperature and high temperature is better than that of treatment The previous increase was 20-50%.

[0058] Implementation steps:

[0059] ① Fix the workpiece after surfacing;

[0060] ②Clamp the induction coil on the manipulator, the heating surface of the induction coil is parallel to the stellite-1 surfacing layer, and the gap between the two planes is 3mm;

[0061] ③ The infrared thermometer is aimed at the induction heating area o...

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Abstract

The invention discloses a high-hardness material surface treatment method and device. According to the method, the surface of a workpiece is heated through an induction coil, an ultrasonic impulse pin is adopted for synchronously performing high-frequency striking on the surface, accordingly, a plastic deformation layer is formed on the surface of the workpiece, stress field distribution is changed, harmful residual tension stress is eliminated, and beneficial residual tension stress is introduced to improve the fatigue strength and the use performance of the workpiece; an organization structure of the surface of the workpiece is detailed, and surface strengthening is formed. The device mainly comprises an induction power supply, the induction coil, an infrared temperature measuring instrument, a temperature controller, an ultrasonic generator, an amplitude-change pole and the impulse pin. The method and the device are suitable for treatment of surfaces, subjected to cold and hot working, of various metals, metal ceramic, metal-compound-based composite materials and the like. According to the method and the device, high-degree automation and high efficiency are realized; the impact layer is deep, the residual tension stress of the surface of the workpiece can be remarkably reduced, and pressure stress is introduced to the surface to improve the fatigue strength and reduce the cracking sensitivity; the surface structure of the workpiece can be detailed, and surface strengthening is formed.

Description

technical field [0001] The invention belongs to the field of material processing, and specifically relates to a method and device for treating the surface of a high-hardness material to eliminate residual tensile stress on the surface of the material, form a compressive stress layer, and refine the surface crystal grains to improve its mechanical properties. The high-hardness material generally refers to a material with a hardness greater than 55HRC, such as a metal material or a metal composite material. Background technique [0002] During the thermal processing (casting, forging, welding, cladding, spraying, etc.) of metal / metal composite materials, due to the temperature cycle and the thermal physical parameters of the welding material and the base material are different, the residual tensile stress is usually generated on the surface and causes Coarse tissue in the heat affected zone. In addition, during the cold processing (turning, milling, planing, grinding, etc.) o...

Claims

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Application Information

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IPC IPC(8): C21D1/10C21D1/09
CPCY02P10/25
Inventor 王邓志曾晓雁胡乾午
Owner WUHAN HIVALUE INTELASER LTD
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