Method for determining thermoforming process parameters of boron-containing microalloyed steel

A technology of microalloy steel and definite method, which is applied in thermal analysis of materials, measuring devices, instruments, etc., can solve problems such as undetermined process parameters, achieve uniform dynamic recrystallization structure, reduce development cost, and ensure performance quality Effect

Inactive Publication Date: 2019-06-07
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

[0004] The above methods give the process window of alloy hot forming from

Method used

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  • Method for determining thermoforming process parameters of boron-containing microalloyed steel
  • Method for determining thermoforming process parameters of boron-containing microalloyed steel
  • Method for determining thermoforming process parameters of boron-containing microalloyed steel

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Example Embodiment

[0041] Example 1

[0042] A method for determining hot forming process parameters of boron-containing microalloy steel. The method for determining the hot forming process parameters of the boron-containing microalloy steel in this embodiment is:

[0043] 1) Heat the boron-containing microalloy steel sample to 1500K at a rate of 10K / s and keep it for 3~5min; then cool it to 1150~1500K at a rate of 3K / s and keep it for 2~3min; then under the same temperature condition , At the deformation rate Compressed isothermally to true strain ε=0.7, the true stress σ data, true strain ε data and σ-ε curve of boron-containing microalloy steel during high temperature plastic deformation are obtained.

[0044] 2) According to the σ-ε curve, set the true stress σ, true strain ε, deformation temperature T and deformation rate Functional relationship

[0045]

[0046] In formula (1): a 0 , A 1 , A 2 ……A 11 Represents different regression coefficients; the acquisition of the regression coefficients: t...

Example Embodiment

[0069] Example 2

[0070] A method for determining hot forming process parameters of boron-containing microalloy steel. The method for determining the hot forming process parameters of the boron-containing microalloy steel in this embodiment is:

[0071] 1) Heat the boron-containing microalloy steel sample to 1500K at a rate of 10K / s and keep it for 3~5min; then cool it to 1150~1500K at a rate of 3K / s and keep it for 2~3min; then under the same temperature condition , At the deformation rate Compressed isothermally to true strain ε=0.7, the true stress σ data, true strain ε data and σ-ε curve of the boron-containing microalloy steel during high temperature plastic deformation are obtained.

[0072] 2) According to the σ-ε curve, set the true stress σ, true strain ε, deformation temperature T and deformation rate Functional relationship

[0073]

[0074] In formula (1): a 0 , A 1 , A 2 ……A 11 Represents different regression coefficients; the acquisition of the regression coefficient...

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Abstract

The invention relates to a method for determining thermoforming process parameters of boron-containing microalloyed steel. According to the method, on the basis of true stress sigma data and true strain epsilon data obtained by a thermal simulation experiment, dynamic recrystallization conditions of the boron-containing microalloyed steel are determined; and thermal processing maps and activationenergy maps of different strains are drawn. An area having the minimum activation energy Q change and fluctuation not exceeding 1% in overlapped regions of safety regions in the thermal processing maps and a dynamic recrystallization region is set as a thermoforming process window of the corresponding strain; and a temperature T and a deformation rate epsilon. that correspond to a maximum power dissipation coefficient eta value in the thermoforming process window are thermoforming process parameters of the corresponding strain. Therefore, defects of coarse grain, crystal mixing, and crack of the boron-containing microalloyed steel can be overcome; and the relatively uniform dynamic recrystallization structure can be obtained. The energy utilization rate is high and the efficient productionand good product quality can be ensured.

Description

technical field [0001] The invention belongs to the technical field of determining thermoforming process parameters. In particular, the invention relates to a method for determining hot forming process parameters of boron-containing microalloy 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 alloy. Therefore, the thermoforming process parameters should be located in the forming safe zone (stable zone) in the temperature-deform...

Claims

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Application Information

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IPC IPC(8): G01N25/14
Inventor 李立新魏雷阳叶奔胡盛德
Owner WUHAN UNIV OF SCI & TECH
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