A kind of high-performance steel containing delta ferrite and its preparation method

A delta ferrite, high-performance technology, applied in the field of high-performance steel, can solve problems affecting service performance, affecting formability, cracking, etc., to achieve the effect of improving plasticity and improving independent innovation ability

Active Publication Date: 2020-01-24
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of Si element will cause cracks in the steel during the forming process, which seriously affects its formability. In addition, the heat-affected zone of high-strength steel will generate martensite during the welding process, thus affecting its performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The components of the steel in the embodiment of the present invention mainly include the following components in weight percentage: C: 0.40%, Si: 0.21%, Mn: 3.0%, Al: 2.3%, N: 0.0035%, P: 0.0065%, S: 0.0072%, the rest is Fe.

[0032] First, a vacuum melting furnace is used to smelt an ingot with a weight of 40-50kg and a size of 100×200×240mm. The ingot was reheated to 1200°C and rolled into a 27 mm slab, followed by cooling in air. These plates were then heated to 1200°C and hot rolled to a thickness of 2.5mm. Finally, cold-roll the steel plate to a thickness of 1.5mm; then heat the steel to the austenitizing temperature of 850°C at a rate of 25°C / s, and take it out after holding the temperature for 30 minutes to fully austenitize the steel piece; The speed of s is rapidly quenched to a temperature of 130°C, and the residence time is about 10s; then the temperature is raised between 130-290°C at a speed of 0.3°C / min, and the carbon distribution is carried out contin...

Embodiment 2

[0035] The components of the steel in the embodiment of the present invention mainly include the following components by weight percentage: C: 0.42%, Si: 0.28%, Mn: 2.6%, Al: 2.7%, N: 0.0044%, P: 0.0062%, S: 0.0075%, the rest is Fe.

[0036]First, a vacuum melting furnace is used to smelt an ingot with a weight of 40-50kg and a size of 100×200×240mm. The ingot was reheated to 1220°C and rolled into a 28 mm slab, followed by cooling in air. These plates were then heated to 1220°C and hot rolled to a thickness of 2.5 mm. Finally, cold-roll the steel plate to a thickness of 1.5 mm; then heat the steel to the austenitizing temperature of 900 °C at a speed of 35 °C / s, and take it out after holding the temperature for 60 minutes to make the steel fully austenitized; The speed of s is rapidly quenched to a temperature of 130°C, and the residence time is about 15s; then the temperature is raised between 130-280°C at a speed of 0.5°C / min, and the carbon distribution is carried out co...

Embodiment 3

[0039] The components of the steel in the embodiment of the present invention mainly include the following components in weight percentage: C: 0.43%, Si: 0.29%, Mn: 2.1%, Al: 2.5%, N: 0.0047%, P: 0.0068%, S: 0.0074%, the rest is Fe.

[0040] First, a vacuum melting furnace is used to smelt an ingot with a weight of 40-50kg and a size of 100×200×240mm. The ingot was reheated to 1250°C and rolled into a 28mm slab, followed by cooling in air. These plates were then heated to 1250°C and hot rolled to a thickness of 2.5 mm. Finally, cold-roll the steel plate to a thickness of 1.5mm; then heat the steel to the austenitizing temperature of 920°C at a rate of 45°C / s, and take it out after holding the temperature for 50 minutes to fully austenitize the steel piece; The speed of s is rapidly quenched to a temperature of 140°C, and the residence time is about 20s; then the temperature is raised between 140-280°C at a speed of 0.6°C / min, and the carbon distribution is carried out contin...

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Abstract

The invention discloses delta-contained ferrite high-performance steel and a preparation method thereof. The delta-contained ferrite high-performance steel comprises the following components: 0.38-0.45% of C, 0.21-0.29% of Si, 2.1-3.0% of Mn, 2.2-3.1% of Al, 0.0035-0.0052% of N, P not more than 0.01%, S not more than 0.01%, and the balance of Fe. The preparation method comprises the following steps: an ingot is firstly smelted; the ingot is heated to roll as a slab, and is cooled in air; then, the slab is hot rolled to a thickness of 2.5 mm; finally, the cold rolling is performed; the steel isheated to an austenitizing temperature, and is taken out after isothermy for full austenitizing and quick quenching; then, the heating carbon distribution is performed between the temperature of (Mf+10)-(Ms+20), so that carbons are distributed from martensite to residual austenite; and finally, the steel is quenched to room temperature to obtain a complex phase structure of high-temperature ferrite, martensite and residual austenite.

Description

technical field [0001] The invention relates to a high-performance steel containing delta ferrite and a preparation method thereof, in particular to a high-performance steel containing a multiphase structure of high-temperature ferrite, martensite and retained austenite, belonging to the field of metal materials. Background technique [0002] At present, the tensile strength of the first generation of automotive steel can be increased from 300MPa of IF steel to 2000MPa of martensitic steel, or even higher. But their plasticity basically decreases with the increase of tensile strength. It can be said that the first-generation automotive steel with low strength-plastic product can no longer meet the dual requirements of lightweight and high safety for the future development of the automotive industry. For the second generation of automotive steel, its tensile strength is at the level of 800~1000MPa, and their plasticity is in the range of 50~80%. It can be seen that the stre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C33/04C21D6/00
CPCC21D6/005C21D6/008C21D2211/001C21D2211/005C21D2211/008C22C33/04C22C38/02C22C38/04C22C38/06
Inventor 刘和平孙凤儿高一波程少磊侯华裴畅贵贾晓帅
Owner ZHONGBEI UNIV
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