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

Determining method of bainite steel hot forming process window

A bainitic steel, determination method technology, applied in special data processing applications, instruments, electrical digital data processing and other directions, can solve the problems of microscopic defects in the deformation area, and achieve the goal of improving product quality, reducing development costs and saving development time. Effect

Inactive Publication Date: 2019-05-28
WUHAN UNIV OF SCI & TECH
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Dislocation movement is the main deformation mechanism of alloys. Apparent activation energy is a quantitative index that characterizes the resistance of dislocation movement. Changes in its value will cause large changes in grain size and lead to microscopic defects in the deformed area. However, the above-mentioned None of the determination methods of the alloy processing technology involves the influence of the change of the apparent activation energy of the alloy on the performance and quality of the formed part

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
  • Determining method of bainite steel hot forming process window
  • Determining method of bainite steel hot forming process window
  • Determining method of bainite steel hot forming process window

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for determining the hot forming process window of bainitic steel. The chemical composition (by mass percentage) of the bainitic steel described in this embodiment is:

[0042] 0.053C-0.310Si-1.567Mn-0.014P-0.005S-0.246Mo-0.014Ti-0.236Ni-0.0012.

[0043] The dimensions of the bainitic steel specimens are

[0044]1) Heat the bainitic steel sample to 1500K at a rate of 10K / s, and keep it for 3-5 minutes; then cool it to 1150-1500K at a rate of 3K / s, and keep it for 2-3 minutes; then at the same temperature, at deformation rate Isothermal compression to the true strain ε = 0.7, to obtain the true stress σ and true strain ε data of the bainite steel during plastic deformation at high temperature, as follows: figure 2 The σ-ε curve shown.

[0045] 2) According to the σ-ε curve, set the true stress σ, true strain ε, deformation temperature T and deformation rate The functional relationship between

[0046]

[0047] In formula (1): a 0 、a 1 、a 2 ...a ...

Embodiment 2

[0065] A method for determining the hot forming process window of bainitic steel. The chemical composition (by mass percentage) of the bainitic steel described in this embodiment is:

[0066] 0.053C-0.310Si-1.567Mn-0.014P-0.005S-0.246Mo-0.014Ti-0.236Ni-0.0012.

[0067] The dimensions of the bainitic steel specimens are

[0068] 1) Heat the bainitic steel sample to 1500K at a rate of 10K / s, and keep it for 3-5 minutes; then cool it to 1150-1500K at a rate of 3K / s, and keep it for 2-3 minutes; then at the same temperature, at deformation rate After isothermal compression to true strain ε=0.7, the true stress σ and true strain ε data of bainite steel during plastic deformation at high temperature are obtained, and the σ-ε curve is obtained.

[0069] 2) According to the σ-ε curve, set the true stress σ, true strain ε, deformation temperature T and deformation rate The functional relationship between

[0070]

[0071] In formula (1): a 0 、a 1 、a 2 ...a 11 Indicates ...

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

No PUM Login to View More

Abstract

The invention relates to a determining method of a bainite steel hot forming process window. According to the technical scheme, true stress Sigma and true strain Epsilon data obtained through the heatsimulation experiment take as the basis, the dynamic recrystallization condition of bainite steel is determined, thermal machining graphs and activation energy graphs of the different kinds of straincan be drawn, the area, with the minimum activation energy Q change and fluctuation smaller than or equal to 1%, in the overlapping area of the safety area and the dynamic recrystallization area in the thermal machining graph is the thermal deforming process window of the corresponding strain; defects of rough grains, mixed grains, cracks and the like in the bainite steel can be effectively avoided, the relatively uniform dynamic recrystallization structure is obtained, and the product property quality is ensured.

Description

technical field [0001] The invention belongs to the technical field of determining the process window of thermoforming. Specifically, it is a method for determining the hot forming process window of bainite steel. Background technique [0002] The performance and quality of alloy hot-formed parts mainly depend on the thermal process and forming process parameters. For a given thermal process, when the original structure and deformation history are constant, the forming parameters mainly include temperature, deformation degree and strain rate. Practice has proved that a suitable combination of forming parameters can ensure good formability and uniform product structure of the alloy, while an improper combination of forming parameters will lead to poor formability and inferior product performance of the metal or alloy. Therefore, the thermoforming process window should be located in the forming safe zone (stable zone) in the temperature-deformation degree-strain rate space, a...

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): C21D7/13G06F17/50
Inventor 李立新张继坤刘升胡盛德
Owner WUHAN 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