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

A technology of phase change induced plasticity and forming limit diagram, which is applied in the direction of material inspection products and test metals, etc., can solve the difficult problems such as the position of forming limit failure of TRIP steel plate and the judgment of formability

Inactive Publication Date: 2009-12-09
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing experimental methods are difficult to judge the forming limit that the TRIP steel plate can withstand, the location where the damage occurs during the forming process, and the formability

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Firstly, a phase transformation-induced plasticity steel plate is prepared, the steps are: smelting low-carbon silicon steel into steel ingots, and smelting low-carbon low-silicon steel into steel ingots, the chemical composition of which is C0.18%, Mn1.38%, Si0.67%, Al0.56%, P0.0075%, S0.0048%, Nb0.014%, 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 3.5mm thick and then cold rolled to 1.0mm thick. The cold-rolled steel plate was kept in sodium chloride at 800°C for 5 minutes, then quenched into potassium nitrate at 400°C for 5 minutes, and cooled to room temperature in air to prepare a low-carbon and low-silicon TRIP steel plate. Then the steel plate is prepared into samples of different specifications and sizes, and the photos of the samples are as follows: figure 1 As shown, the length is 180mm, and the widths of wide strip samples are 180mm, 160mm and 120mm respective...

Embodiment 2

[0035] Firstly, the phase change induced plastic steel plate is prepared, the steps are: low carbon high manganese steel is smelted into a steel ingot, and its chemical composition 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 into a 30mm thick forging billet. Hot rolled to 5.0mm thick and then cold rolled to 1.0mm thick. Heat the cold-rolled steel plate to 1100°C for 15 minutes, then water-cool to room temperature. Prepared into high manganese TRIP steel plate. Then the steel plate is prepared into samples of different specifications and sizes, the method is the same as in Example 1.

[0036] The method for establishing the forming limit diagram of the TRIP steel plate is the same as in Example 1, wherein the organic solvent used for sample cleaning is acetone, and the forming limit diagram of the TRIP steel plate is as follows Figure 6 shown. From Figure 6 It can be seen that the FL...

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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) a transformation induced plasticity steel plate is prepared into a sheet forming experiment sample; (2) the sample is cleaned, and is printed with grids; (3) a forming experiment device is started to punch the sample until the sample generates necking or cracking, then the experiment stops; (4) a critical region is shot; and (5) the long axis diameter and the short axis diameter of a critical grid circle are measured so as to calculate the principal strain and minor strain of a project, build a strain coordinate system and build the forming limit diagram of the transformation induced plasticity steel plate. The experimental method of the invention adopts standard experiment devices, thus the method can judge the shaping limit of the transformation induced plasticity steel plate, destruction position and shaping performance in the shaping process.

Description

technical field [0001] The invention relates to a method for establishing a forming limit diagram of a steel plate, in particular to an experimental method for establishing a phase transformation-induced plasticity 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. When the sheet metal forming method is used fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/20
Inventor 丁桦唐正友
Owner NORTHEASTERN UNIV LIAONING
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