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Experimental method for building forming limit diagram of phase change induced plasticity steel plate

A phase change-induced plasticity and forming limit diagram technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of material waste, time-consuming, labor-intensive, etc.

Inactive Publication Date: 2011-04-06
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of the existing establishment of plate and strip forming limit diagrams that require standard test devices, preparation of test pieces of different widths, and changes in lubrication conditions, which are labor-intensive, material-intensive, and time-consuming. The thickness and strain hardening exponent can establish the model method of the phase change-induced plastic steel plate forming limit diagram, reduce the test workload of establishing the phase change-induced plastic steel plate forming limit diagram, successfully predict the phase change-induced plastic steel plate failure, and effectively evaluate its forming performance

Method used

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  • Experimental method for building forming limit diagram of phase change induced plasticity steel plate
  • Experimental method for building forming limit diagram of phase change induced plasticity steel plate
  • Experimental method for building forming limit diagram of phase change induced plasticity steel plate

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preparation example Construction

[0042]The preparation method of TRIP steel plate in the embodiment of the present invention is divided into two kinds: 1, low-carbon low-silicon steel is smelted into steel ingot, composition is to contain C0.18~0.20%, Mn1.30~1.45%, Si0.60~ 0.70%, Al0.50~0.60%, P≤0.009%, S≤0.007%, Nb≤0.040%, and the balance is Fe. After the steel ingot is kept at 1200°C for 1.5 to 2 hours, it is forged into a 30mm thick forging billet. Hot rolled to a thickness of 3.5mm, then cold rolled to a thickness of 1.0mm to obtain a cold-rolled steel plate, the cold-rolled steel plate was kept in a chloride salt at 800°C for 5 minutes, then quenched into a nitrate at a temperature of 400°C for 5 minutes, and air-cooled to room temperature, and prepared into TRIP steel plate. 2. Smelting low-carbon high-manganese steel into steel ingots, the chemical composition of which is C600ppm, Mn23.8%, Si3.0%, Al2.7%, and the balance is Fe. After the steel ingot is kept at 1150°C for 1.5 to 2 hours, it is forged ...

Embodiment 1

[0050] Firstly, the phase transformation induced plastic steel plate is prepared by smelting low-carbon silicon steel into steel ingots, the composition of which is C0.19%, Mn1.32%, Si0.70%, Al0.51%, P0.0068%, S0.0068% by weight %, the balance is Fe. After the steel ingot is kept at 1200°C for 1.5-2hrs, it is forged into a 30mm thick forging billet, hot rolled to a thickness of 3.5mm, and then cold rolled to a thickness of 1.0mm to obtain a cold rolled steel plate, which is then cut into small pieces of reasonable size. Blocks were kept in chloride salt at 800°C for 5 minutes, then quenched into nitrate at 400°C for 5 minutes, and cooled to room temperature in air to prepare TRIP steel plates.

[0051] Measure the strain hardening exponent n of this steel plate to be 0.323, t=1.0mm, calculate FLD according to formula (1) 0 = 0.576. Engineering Principal Strains e for Establishing Forming Limit Diagrams for Phase Transformation-Induced Plastic Steel Sheets 1 with engineering...

Embodiment 2

[0059] Firstly, the phase transformation induced plastic steel plate is prepared by smelting low-carbon silicon steel into steel ingots, and its composition is C0.18%, Mn1.38%, Si0.67%, Al0.56%, P0.0075%, S0.0048% by weight %, Nb0.014%, and the balance is Fe. After the steel ingot is kept at 1200°C for 1.5-2hrs, it is forged into a 30mm thick forging billet, hot rolled to a thickness of 3.5mm, and then cold rolled to a thickness of 1.0mm to obtain a cold rolled steel plate, which is then cut into small pieces of reasonable size. Blocks were kept in chloride salt at 800°C for 5 minutes, then quenched into nitrate at 400°C for 5 minutes, and cooled to room temperature in air to prepare TRIP steel plates.

[0060] Measure the strain hardening exponent n of this steel plate to be 0.325, t=1.0mm, calculate FLD according to formula (1) 0 = 0.580. Engineering Principal Strain e established by Forming Limit Diagram of Phase Transformation Induced Plastic Steel Sheet 1 with engineer...

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Abstract

The invention discloses an experimental method for building forming limit diagram of transformation induced plasticity steel plates, relating to the building method of forming limit diagrams. The method of the invention comprises the following steps: (1) the thickness and the strain hardening index of the transformation induced plasticity steel plate are determined; (2) the limit strain value of the transformation induced plasticity steel plate under the condition of plane strain state is calculated; (3) a strain coordinate system is built, data is synthesized on the coordinate system so as to build the forming limit diagram of the transformation induced plasticity steel plate. The invention is an effective tool for solving the transformation induced plasticity steel plate material punching problem, can successfully predict transformation induced plasticity steel plate material invalidation, effectively estimates the forming performance and reduces the existing measuring workload for building a shaping limit diagram.

Description

technical field [0001] The invention relates to a method for establishing a forming limit diagram of a steel plate, in particular to a model method for establishing a phase transformation-induced plastic forming limit diagram for a steel plate. Background technique [0002] TRIP (Transformation Induced Plasticity) steel, also known as phase transformation induced plasticity steel, is a high-strength and high-plasticity steel developed in recent years. Used as an automobile steel plate, it can reduce the weight of the vehicle and reduce fuel consumption. At the same time, it has a strong energy absorption capacity, can resist plastic deformation during impact, and significantly improves the safety level of the automobile. It has obvious advantages. Sheet metal forming is an important part of metal forming, and it is widely used in manufacturing industries such as aerospace, automobile, light industry and household appliances. In the sheet metal forming process, people urgent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 唐正友丁桦
Owner NORTHEASTERN UNIV LIAONING
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