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A method for preparing sheet gradient nanocrystals by pulsating impact combined with multi-directional rotating rolling

A technology of pulsating impact and nanocrystals, which is applied in the field of surface strengthening and modification of metal materials, can solve the problems of insignificant surface nanotechnology, increased surface roughness, complicated operation procedures, etc., and achieves increased cumulative plastic deformation, reduced Small surface roughness, evenly distributed effect

Active Publication Date: 2020-01-14
安徽格锐鑫智能装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the surface machining method in the surface self-nanoization technology of metal materials, the impact load will increase the surface roughness of the material. The treatment method of impact first and then rolling is not only high cost, long cycle and complicated operation process, but also the traditional rolling technology surface In order to solve the problems such as the inconspicuous effect of nanometerization, the present invention provides a method for preparing plate gradient nanocrystals with pulsating impact combined with multi-directional rotary rolling. Multi-directional rotary rolling is carried out while the impact load is acting, combining the advantages of the two loading methods , which not only increases the cumulative plastic deformation of the surface of the material, but also effectively enhances the dynamic plastic flow of the surface of the material, thereby significantly improving the effect of nano-material surface

Method used

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  • A method for preparing sheet gradient nanocrystals by pulsating impact combined with multi-directional rotating rolling
  • A method for preparing sheet gradient nanocrystals by pulsating impact combined with multi-directional rotating rolling
  • A method for preparing sheet gradient nanocrystals by pulsating impact combined with multi-directional rotating rolling

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Experimental program
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Effect test

Embodiment 1

[0033] (1) Keep the plate in a static state and adjust the striker parameters (pulsation impact frequency and impact velocity): for example, the impact velocity is 30m / s, the maximum equivalent plastic strain caused by impacting AISI 4340 steel is 0.11, and the minimum grain size is refined is 258.8µm, such as figure 2 shown.

[0034] (2) Keep the plate in a static state and adjust the parameters of multi-directional rotary rolling (rotation rate and static pressure): for example, the rotation rate is 5m / s, and the ball is pressed down by 3mm under the action of static pressure. Plastic strain and grain refinement size such as image 3 As shown, it is obvious that, compared with the single impact condition, under the synergistic effect of impact load and rolling load, the accumulated plastic deformation of the sheet increases and the refined grain size decreases.

[0035] (3) Keeping the plate in a static state, under the condition that the rotation speed is 3m / s and the ba...

Embodiment 2

[0038](1) Keep the plate in a static state and adjust the striker parameters (pulsation impact frequency and impact velocity): for example, the impact velocity is 50m / s, and the equivalent plastic strain and grain refinement size caused by impacting AISI 4340 steel are as follows: Figure 5 As shown, equivalent to the working condition of the impact velocity of 30m / s, the equivalent plastic strain caused by the impact velocity of 50m / s increases, and the refined grain size decreases.

[0039] (2) Keep the plate in a static state and adjust the parameters of multi-directional rotary rolling (rotation rate and static pressure): for example, the rotation rate is 5m / s, the ball is pressed down by 5mm under the action of static pressure, and the equivalent rolling impact area of ​​a single roll is Plastic strain and grain refinement size such as Image 6 As shown, it can be clearly seen that compared with the working condition of the ball pressing down by 3mm, the plastic deformati...

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Abstract

The invention discloses a pulse impacting type coordinative multi-directional rotating and rolling pressing preparation method of a gradient nanocrystalline of a board. The method is characterized inthat the surface of a metal board is impacted through a high-intensity steel impacting pin in a high-frequency pulse type impacting mode, and the impacted board surface is rolled and pressed in a rapid multi-directional rotating and rolling pressing mode, thus the board surface layer is subjected to strong plastic deformation, and the surface is induced to realize nanocrystallization, and as a result, the gradient nanocrystalline is prepared. The method has the advantages that (1) the surface nanocrystallization processing period is short; the pulse impacting and the multi-directional rotatingand rolling pressing are synchronously carried out, so that the operation period of impacting and then rolling and pressing can be greatly reduced; (2) the surface nanocrystallization effect is obvious; the accumulated plastic deformation of the surface layer of a metal material is greatly improved under the coordination effect of the impact load and the extruding load, and moreover, the dynamicplastic flowing capacity of the surface layer of the material can be effectively improved; and (3) the surface roughness of the material is reduced; and a protruded part on the surface of the materialcan fills a concave part based on the plastic flowing capacity of the material and under the multi-directional rotating and rolling pressing effects.

Description

technical field [0001] The invention belongs to the technical field of metal material surface strengthening and modification, and specifically relates to a method for preparing plate gradient nanocrystals by pulsating impact and multi-directional rotating rolling. Background technique [0002] In the service environment, the failure of metal materials mostly originates from its surface, and the fatigue, corrosion and wear of materials are very sensitive to its surface structure and performance. Research in recent years has found that surface nanotechnology can prepare a gradient nanostructure layer with a certain thickness on the surface of metal materials, which effectively improves the overall mechanical properties and service behavior of materials. Surface nanotechnology is a kind of material surface modification technology, which uses various physical and chemical methods to promote the generation of nano-scale grain layers on the surface of metal materials, and greatly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D7/04C22F1/00
CPCC21D7/04C21D2201/03C22F1/00
Inventor 王成栾振辉伍广李雪斌来永斌周毅钧李坤王龙
Owner 安徽格锐鑫智能装备有限公司