Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method to improve the matching degree of strength and plasticity of metal gradient structures

A gradient structure and matching technology, applied in the field of material processing, can solve the problems of increased roughness, decreased plasticity, increased strength, etc., to achieve the effect of reducing roughness, simple process, and retaining work hardening

Inactive Publication Date: 2020-02-28
NANJING UNIV OF SCI & TECH
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art that the roughness of the metal plate increases after high-energy shot peening, the strength increases and the plasticity decreases too much, the present invention provides a method for improving the strength and plasticity matching of the metal gradient structure, which can be used for high-energy shot peening surface nanometer The metal plate after chemical treatment adopts controllable rolling deformation to reduce the surface roughness of the sample while maintaining the original hardness gradient effect and fine-grained / nano-crystalline structure of the sample after high-energy shot peening, and retains the original work hardening and fine grain. Grain strengthening, and then recovery annealing at low temperature for a short time, not only maintains the fine-grained structure, but also partially recovers the dislocations inside the grains, increases the storage energy of dislocations, and improves the matching degree of strength and plasticity of the surface nano-sized metal sheet

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method to improve the matching degree of strength and plasticity of metal gradient structures
  • A method to improve the matching degree of strength and plasticity of metal gradient structures
  • A method to improve the matching degree of strength and plasticity of metal gradient structures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] ①Cutting: Prepare an annealed 6063 aluminum alloy plate with a thickness of 10mm, ensuring that the upper and lower surfaces are parallel; ②Surface cleaning: Use alcohol and other organic solvents to remove the grease on the upper and lower sides of the plate at room temperature. ③Surface nano treatment: choose 5mm GCr15 steel shot. The speed of high-energy shot peening equipment is 25m / s, and the processing time is 15min. ④Flat rolling: two-roll four-roll rolling mill (two-roll Φ400mm×350mm; four-roll cold rolling: Φ100mm / Φ380mm×350mm). Rolling is carried out on the plate after the surface nano treatment, keeping a small amount of deformation in each pass, the total deformation amount is 12%, 4 passes, and the rolling speed is 5m / s. The sample thickness is sequentially from 10mm, to 9.5mm, to 9.0mm, to 8.8mm. ⑤ Low temperature and short time annealing: Vacuum annealing furnace anneals the finished products obtained after shot peening and rolling at 50°C, 75°C, and 10...

Embodiment 2

[0031] ① Cutting: prepare a piece of annealed 99.99wt% pure copper plate with a thickness of 4.7mm, ensuring that the upper and lower surfaces are parallel; ② Surface cleaning: use alcohol and other organic solvents to remove the grease on the upper and lower sides of the plate at room temperature. ③Surface nano treatment: choose 3mm GCr15 steel shot. The speed of the high-energy shot peening equipment is 25m / s, and the processing time is 30min. ④Flat rolling: two-roll four-roll rolling mill (two-roll Φ400mm×350mm; four-roll cold rolling: Φ100mm / Φ380mm×350mm). Rolling is carried out on the plate after the surface nano treatment, keeping a small amount of deformation in each pass, the total deformation amount is 30%, 7 passes, and the rolling speed is 40m / s. The sample thickness was reduced from 4.7mm to 3.3mm. ⑤ Low temperature and short time annealing: Vacuum annealing furnace anneals the finished products obtained after shot peening and rolling at 50°C, 75°C, and 100°C for...

Embodiment 3

[0037]①Cutting: Prepare an annealed 6063 aluminum alloy plate with a thickness of 12mm, ensuring that the upper and lower surfaces are parallel; ②Surface cleaning: Use alcohol and other organic solvents to remove the grease on the upper and lower sides of the plate at room temperature. ③Surface nano treatment: choose 5mm GCr15 steel shot. The speed of high-energy shot peening equipment is 25m / s, and the processing time is 15min. ④Flat rolling: two-roll four-roll rolling mill (two-roll Φ400mm×350mm; four-roll cold rolling: Φ100mm / Φ380mm×350mm). Rolling is carried out on the plate after surface nano-treatment, keeping a small amount of deformation in each pass, with a total deformation amount of 50%, and 8 passes. The sample thickness ranges from 12mm to 6mm.

[0038] Table 3 Roughness and maximum hardness of coarse-grained aluminum, aluminum alloy plate after surface nano-treatment by high-energy shot peening, and aluminum alloy plate after shot peening and rolling

[0039] ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
yield strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for improving the strength and the plasticity matching degree of a metal gradient structure. The method comprises the following steps: firstly, performing high-energy shot blasting surface nanocrystallization treatment on a metal plate of which the surface is cleaned, secondly, rolling the plate after surface nanocrystallization treatment, controlling rolling reduction within 12-30%, and finally performing vacuum annealing for 30-60 minutes at 50-100 DEG C. While the remarkable characteristics of thickness direction gradient textures of the roller metal plate are maintained, the surface roughness is degraded, fine crystal in the textures is still maintained in short-term vacuum annealing at low temperature, displacement parts inside crystal granules are returned, and thus the displacement storage capacity is increased. By adopting the method, the problems that a metal plate which is processed by using high-carbon steel pellets with a conventional shot blasting technique is high in surface roughness and low in plate strength and plasticity matching degree are effectively solved, the metal strength is remarkably improved, the plasticity matching degree is remarkably increased, and requirements of actual application are met.

Description

technical field [0001] The invention relates to a method for improving the strength and plastic matching degree of a metal gradient structure, which belongs to the technical field of material processing. Background technique [0002] Surface nanotechnology mainly uses a simple power device to provide enough kinetic energy for a large number of hard small metal balls, so that the balls continuously hit the surface of the processed sample at a certain speed, so that the material in a certain depth area on the surface of the sample Severe plastic deformation occurs, and then a fine tissue layer with a certain thickness is formed on the surface of the sample. Surface nanotechnology uses high-energy shot peening to mechanically treat the surface of metal materials to obtain a gradient structure of nanocrystalline / ultrafine-crystalline and coarse-crystalline layers along the thickness, which overcomes the current technical difficulties in the preparation of three-dimensional large...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/00C22F1/04C22F1/08
CPCC22F1/00C22F1/04C22F1/08
Inventor 刘艳芳刘瑛熊炜李玉胜王向王经涛朱运田
Owner NANJING UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com