Heat treatment process for 980 MPa grade automotive steel with high product of strength and elongation

A high-strength plastic product, 980mpa technology, applied in the field of material heat treatment, can solve the problem that process parameters cannot be reasonably coordinated with each other, and achieve the effects of short heat treatment process time, good application prospects, and heat treatment time saving

Inactive Publication Date: 2014-02-05
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the strength-plastic product of the steel produced by the industrial Q&P heat treatment process in the past is less than 23000MPa%, which shows that the existing heat treatment process parameter values ​​cannot achieve a s

Method used

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  • Heat treatment process for 980 MPa grade automotive steel with high product of strength and elongation
  • Heat treatment process for 980 MPa grade automotive steel with high product of strength and elongation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Remove rust and oil from the TRIP780 cold-rolled steel plate, and clean it to avoid uneven heating during heat treatment.

[0022] (1) Austenitization: heat the pretreated TRIP780 cold-rolled steel plate at 820°C for 5 minutes;

[0023] (2) Quenching: Rapidly cool to 250°C for 5s after the heat preservation;

[0024] (3) Partitioning: After quenching, rapid heating is carried out for partitioning, the partitioning temperature is controlled between 410°C and the partitioning time is between 45s, and finally water quenching is carried out to obtain steel with enhanced performance. The EBSD diagram is as follows figure 1 As shown, the volume fraction of the FCC phase in the figure, that is, the retained austenite, is obtained by the EBSD calculation software, and the volume fraction of the retained austenite is more than 16%; figure 2 As shown, a large amount of film-like distribution and retained austenite between martensite laths can also be seen from the TEM pictures....

Embodiment 2

[0027] Remove rust and oil from the TRIP780 cold-rolled steel plate, and clean it to avoid uneven heating during heat treatment.

[0028] (1) Austenitization: heat the pretreated TRIP780 cold-rolled steel plate at 840°C for 2 minutes;

[0029] (2) Quenching: Rapid cooling to 230°C for 10s after the heat preservation is completed;

[0030] (3) Partitioning: After quenching, rapid heating is carried out for partitioning, the partitioning temperature is controlled between 400°C and the partitioning time is between 60s, and finally water quenching is carried out to obtain steel with enhanced properties.

[0031] After testing, its tensile strength is 1109MPa, its elongation after fracture is 23.8%, and its strong plasticity reaches 26394MPa%, which is much higher than that of steel treated by general industrial Q&P.

Embodiment 3

[0033] Remove rust and oil from the TRIP780 cold-rolled steel plate, and clean it to avoid uneven heating during heat treatment.

[0034] (1) Austenitization: heat the pretreated TRIP780 cold-rolled steel plate at 830°C for 3 minutes;

[0035] (2) Quenching: Rapid cooling to 240°C for 8s after the heat preservation is completed;

[0036] (3) Partitioning: after quenching, rapid heating is carried out for partitioning, the partitioning temperature is controlled between 420°C and the partitioning time is between 30s, and finally water quenching is carried out to obtain steel with enhanced properties.

[0037] After testing, its tensile strength is 1098MPa, its elongation after fracture is 24.2%, and its strong plasticity reaches 26571MPa%, which is much higher than that of steel treated by general industrial Q&P.

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Abstract

The invention belongs to the technical field of heat treatment of materials, and particularly relates to a heat treatment process for 980 MPa grade automotive steel with a high product of strength and elongation. The heat treatment process disclosed by the invention comprises the following steps: carrying out heat preservation on a TRIP780 cold-rolled steel plate subjected to pretreatment for 2-5 min at a temperature of 820-840 DEG C; then, after the heat preservation is completed, rapidly cooling the steel plate to 230-250 DEG C, and carrying out heat preservation on the steel plate for 5-10 s; and after the steel plate is quenched, rapidly heating the steel plate, controlling the partitioning temperature at 400-420 DEG C and controlling the partitioning time at 30-60 s; and finally, carrying out water quenching on the steel plate so as to obtain 980 MPa grade automotive steel with a product of strength and elongation of 26300-26800 MPa % and a percentage elongation of 23.8-24.2%. According to the technical scheme of the invention, through the reasonable mutual cooperation of austenitizing, quenching and partitioning systems, automotive steel with a higher product of strength and elongation is produced.

Description

technical field [0001] The invention belongs to the technical field of material heat treatment, and in particular relates to a heat treatment process of 980MPa grade high-strength plasticity automobile 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 have also emerged. As people pay more and more 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, but for the plate steel for automobiles 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 traditional steel with good plasticity is insufficient. As the thickness of the steel plate decreases...

Claims

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Application Information

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IPC IPC(8): C21D6/00C21D1/18
Inventor 王建军王炳权刘沿东刘春明孟庆格
Owner NORTHEASTERN UNIV
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