Q&P heat treatment method of TRIP590 steel of C-Mn-Al series

A heat treatment method and c-mn-al technology, which is applied in the field of material heat treatment, can solve the problems that the process parameters cannot be reasonably matched with each other and cannot be achieved, and achieve the effect of short heat treatment process time, reliable numerical value and saving heat treatment time.

Inactive Publication Date: 2014-05-28
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the steel produced by the Q&P heat treatment process using TRIP590 steel as the base material currently has a strength-plasticity product of less than 20000MPa%, indicating that the existing Q&P heat treatment proces

Method used

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  • Q&P heat treatment method of TRIP590 steel of C-Mn-Al series
  • Q&P heat treatment method of TRIP590 steel of C-Mn-Al series
  • Q&P heat treatment method of TRIP590 steel of C-Mn-Al series

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Experimental program
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Effect test

Embodiment 1

[0024] Remove rust and oil from the C-Mn-Al series TRIP590 cold-rolled steel plate, and clean it to avoid uneven heating during the heat treatment process.

[0025] (1) Austenitization: The pre-treated TRIP590 cold-rolled steel sheet is kept at 1080°C for 3 minutes;

[0026] (2) Quenching: After the heat preservation is completed, it is rapidly cooled to 200 °C for 25s;

[0027] (3) Partitioning: After quenching, rapid heating is performed for partitioning, the partitioning temperature is controlled at 370 °C, the partitioning time is 45s, and finally water quenching is performed to obtain a steel with enhanced performance. The XRD pattern is as follows figure 1 As shown in the calculation formula, the volume fraction of retained austenite is more than 16%; the TEM image is as follows figure 2 A large amount of film-like distribution and retained austenite between the martensitic laths can also be seen from the TEM image; the STEM image is shown in image 3 It can be seen f...

Embodiment 2

[0030] Remove rust and oil from the C-Mn-Al series TRIP590 cold-rolled steel plate, and clean it to avoid uneven heating during the heat treatment process.

[0031] (1) Austenitization: The pre-treated TRIP590 cold-rolled steel sheet is kept at 1150°C for 2min;

[0032] (2) Quenching: After the heat preservation is completed, it is rapidly cooled to 210 °C for 30s;

[0033] (3) Partitioning: After quenching, rapid heating is performed for partitioning, the partitioning temperature is controlled at 350 °C, the partitioning time is 60s, and finally water quenching is performed to obtain steel with enhanced properties.

[0034] After testing, the tensile strength is 967MPa, the elongation after fracture is 22.5%, and the strong-plastic product is 21757MPa%, which is much higher than that of the steel produced by Q&P treatment with TRIP590 as the base material.

Embodiment 3

[0036] Remove rust and oil from the C-Mn-Al series TRIP590 cold-rolled steel plate, and clean it to avoid uneven heating during the heat treatment process.

[0037] (1) Austenitization: The pre-treated TRIP590 cold-rolled steel sheet is kept at 1000 °C for 5 minutes;

[0038] (2) Quenching: After the heat preservation is completed, it is rapidly cooled to 220°C for 10s;

[0039] (3) Partitioning: After quenching, rapid heating is performed for partitioning, the partitioning temperature is controlled at 360 °C, the partitioning time is 30s, and finally water quenching is performed to obtain steel with enhanced performance.

[0040] After testing, the tensile strength is 970MPa, the elongation after fracture is 22.2%, and the strong-plastic product is 21534MPa%, which is much higher than that of the steel produced by Q&P treatment with TRIP590 as the base material.

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Abstract

The invention belongs to the technical field of material heat treatment, and particularly relates to a Q&P (Quenching and Partitioning) heat treatment method of TRIP590 steel of the C-Mn-Al series. The heat treatment method comprises the following steps: conducting heat preservation on pre-processed TRIP590 cold-roll steel sheets at 1,000-1,150 DEG C for 2-5 min; after the heat preservation, rapidly cooling the steel sheets to 200-220 DEG C and conducting heat preservation for 10-30 s; quenching, and then rapidly heating to 350-370 DEG C to distribute for 30-60 s; finally, water quenching to obtain the TRIP590 steel with the high-strength plastic product of 21,000-22,000 MPa% and the elongation of 22.0-23.0% for automobiles. According to technical scheme of the invention, time of the total heat treatment process is short, and temperature of the austenitizing system is low, so that heating temperature is lowered, and heat treatment time is saved; compared with other heat treatment technologies, the production efficiency of the steel is greatly improved and the cost is saved; the heat treatment method has better application prospects in industrial production.

Description

technical field [0001] The invention belongs to the technical field of material heat treatment, in particular to a heat treatment method for Q&P of C-Mn-Al series TRIP590 steel. Background technique [0002] In today's world, cars are inseparable from people's lives, but the problems of high energy consumption and high pollution caused by the use of cars also appear. With the continuous strengthening of people's attention to environmental protection, resources and energy. There is an urgent need for cars to be lightweight. [0003] The main method to realize the lightweight of automobiles is to reduce the thickness of the steel plate. However, for the automobile plate steel produced by the traditional process, reducing the thickness of the steel plate will have two major disadvantages, which cannot meet the production requirements. First, the strength of the traditional steel with good plasticity is insufficient. As the thickness of the steel plate decreases, the deformati...

Claims

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Application Information

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IPC IPC(8): C21D1/18
Inventor 王建军王炳权刘沿东孟庆格刘春明
Owner NORTHEASTERN UNIV
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