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

TWIP steel laser welding method based on high-entropy alloy intermediate layer

A high-entropy alloy, laser welding technology, applied in laser welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems of mechanical properties decline, serious burn-out segregation of weld elements, and restricted use.

Active Publication Date: 2022-07-12
HUNAN UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, for TWIP steel, during the welding process, the weld elements burn and segregate seriously, and MnS, Al 2 o 3 Equal segregation particles, so that the elongation after welding is only about 50% of the base metal, and its mechanical properties are greatly reduced, which greatly limits its use in automotive steel

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
  • TWIP steel laser welding method based on high-entropy alloy intermediate layer
  • TWIP steel laser welding method based on high-entropy alloy intermediate layer
  • TWIP steel laser welding method based on high-entropy alloy intermediate layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The composition of the intermediate layer selected in this embodiment is CoCrFeNi high-entropy alloy, and its atomic ratio is Co:Cr:Fe:Ni=1:1:1:1.

[0056] A TWIP steel laser welding method based on a high-entropy alloy intermediate layer, the specific steps are as follows:

[0057] The Co, Cr, Fe, and Ni of the metal raw material particles (purity of 99.99%) are proportioned according to the atomic ratio of 1:1:1:1, weighed, and repeatedly smelted by an arc melting furnace for 5 times. ingot. Under the protection of argon, the ingot was homogenized and heat-treated at 1200°C for 24h, and then water quenched. Then, use wire cutting technology to cut the high-entropy alloy into metal sheets with a thickness of 0.5mm, and the remaining dimensions are the same as the size of the surface to be welded. Significant oxide layer;

[0058] Put the TWIP steel to be welded into an electric heating furnace for annealing treatment, the heating rate is 10°C / min, the holding temper...

Embodiment 2

[0064] The welding method of this embodiment is basically the same as that of Embodiment 1, except that the high-entropy alloy used is CoCrNi, and its atomic ratio is Co:Cr:Ni=1:1:1.

[0065] The TWIP steel welded joint with CoCrNi as the intermediate layer and the directly welded joint of the reference TWIP steel are tested, and the obtained stress-strain curve is as follows: Figure 4 shown.

[0066] Depend on Figure 4 It can be seen that the tensile strength of the welded joint that is directly laser welded without adding the intermediate layer is 382.6MPa and the elongation is 4.74%, while the tensile strength of the welded joint that is laser welded by adding CoCrNi high entropy alloy in Example 2 is 384.7 MPa, the elongation is 6.83%. It can be seen that CoCrNi high-entropy alloy flakes are used as the welding intermediate layer of TWIP steel in this example, and the obtained welded joint has higher strength and better elongation.

[0067] In the welding method provi...

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
thicknessaaaaaaaaaa
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention provides a TWIP steel laser welding method based on a high-entropy alloy interlayer, which takes a high-entropy alloy as the interlayer, adopts a laser welding method to connect TWIP steel, and comprises the following steps: preparing a high-entropy alloy material, and cutting the high-entropy alloy material into slices, the high-entropy alloy material being at least one of CoCrFeNiMn and a sub-alloy system thereof; the TWIP steel is subjected to heat treatment, specifically, the TWIP steel to be welded is placed in an electric heating furnace to be subjected to annealing treatment, and then water quenching treatment is conducted; the TWIP steel subjected to heat treatment is subjected to surface treatment, and an oxide layer on the surface of the TWIP steel is removed; the high-entropy alloy sheet is placed in absolute ethyl alcohol to be subjected to ultrasonic cleaning for 15-40 min, and then the high-entropy alloy sheet is taken out and dried; and the high-entropy alloy sheet is placed between the two pieces of TWIP steel, the high-entropy alloy sheet is attached to the to-be-welded face, laser welding is adopted in the protective gas atmosphere, and the TWIP steel welding joint is obtained. According to the TWIP steel laser welding method based on the high-entropy alloy intermediate layer, the strength of a TWIP steel welding joint can be improved, and the overall welding quality is guaranteed.

Description

technical field [0001] The invention relates to the technical field of welding, in particular to a laser welding method for TWIP steel based on a high-entropy alloy intermediate layer. Background technique [0002] The lightweight design of automobiles has become the main trend of research in the automobile industry today, which aims to reduce the mass of the automobile body, reduce energy consumption, and reduce the corresponding exhaust emissions. Therefore, thin-gauge ultra-high-strength automotive sheets with excellent formability are urgently needed to reduce the car's own weight. At present, among many new steel materials, high manganese austenitic steel (TWIP steel) with low stacking fault energy has the most potential, and its good strength and plasticity matching, excellent impact energy absorption capacity and formability make it quickly become a Auto steel focus. [0003] TWIP steel is also known as twin-induced plastic deformation steel, which usually has low s...

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 Applications(China)
IPC IPC(8): B23K26/21B23K26/60B23K26/70
CPCB23K26/21B23K26/60B23K26/70
Inventor 吴正刚汪俊杰李忠涛
Owner HUNAN UNIV
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