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Method for Improving Resistance to Hydrogen-Induced Delayed Fracture of Fe-mn-al-c Lightweight Steel

A fe-mn-al-c, delayed fracture technology, applied in the field of light steel, can solve the problems of delayed fracture of high-strength light steel, car factory economy, reputation loss, serious hydrogen embrittlement sensitivity, etc., to achieve low price, Small investment, the effect of improving the resistance to hydrogen-induced delayed fracture

Active Publication Date: 2022-06-07
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although Fe-Mn-Al-C light steel has become a new generation of automotive steel with strong development potential due to its unique advantages, its development still faces some key scientific problems: delayed fracture of high-strength light steel question
High strength is an inevitable trend in the development of automobile steel, and it also brings new challenges to automobile steel. When the tensile strength exceeds 1000 MPa, hydrogen-induced delayed fracture is prone to occur, and the higher the strength, the more serious the susceptibility to hydrogen embrittlement; Delayed fracture will bring serious safety hazards to cars and passengers, and cause huge economic and reputation losses to the car factory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] C: 0.9%, Al: 9.0%, Mn: 26.0%, Cu: 1.0%, and the rest are Fe and inevitable impurities (wherein, Si: ≤ 0.1%, P ≤ 0.03%, S: ≤ 0.005%).

[0038] The raw materials are weighed according to the preset ratio, and then placed in a vacuum intermediate frequency induction furnace to be smelted, cast into ingots, and cooled to room temperature; forging treatment: heating to 1050 ° C before forging, holding for 1.5 h, forging temperature 950 ° C, forging After air cooling to room temperature; hot rolling treatment: heating to 1050 ℃ before hot rolling, holding for 1 hour, starting rolling temperature 1000 ℃, final rolling temperature 850 ℃, reduction rate of 20% each time, rolling 9 passes; cold rolling treatment : Heating to 950℃ before cold rolling, holding for 1h, the reduction rate of each time is 5%, rolling 13 times; the aging treatment temperature is 450℃, the aging time is 3h, and the water is cooled to room temperature.

Embodiment 2

[0040] C: 1.0%, Al: 10.0%, Mn: 28.0%, Cu: 3.0%, and the rest are Fe and inevitable impurities (wherein, Si: ≤ 0.1%, P ≤ 0.03%, S: ≤ 0.005%). The raw materials are weighed according to the preset ratio, and then placed in a vacuum intermediate frequency induction furnace to be smelted, cast into ingots, and cooled to room temperature; forging treatment: heating to 1050 ° C before forging, holding for 1.5 h, forging temperature 950 ° C, forging After air cooling to room temperature; hot rolling treatment: heating to 1050 ℃ before hot rolling, holding for 1 hour, starting rolling temperature 1000 ℃, final rolling temperature 850 ℃, reduction rate of 20% each time, rolling 9 passes; cold rolling treatment : Heating to 950℃ before cold rolling, holding for 1h, the reduction rate of each time is 5%, rolling 13 times; aging treatment temperature is 550℃, aging time is 3h, and air-cooled to room temperature.

Embodiment 3

[0042] C: 1.2%, Al: 11.0%, Mn: 31.0%, Cu: 5.0%, and the rest are Fe and inevitable impurities (wherein, Si: ≤ 0.1%, P ≤ 0.03%, S: ≤ 0.005%). The raw materials are weighed according to the preset ratio, and then placed in a vacuum intermediate frequency induction furnace to be smelted, cast into ingots, and cooled to room temperature; forging treatment: heating to 1050 ° C before forging, holding for 1.5 h, forging temperature 950 ° C, forging After air cooling to room temperature; hot rolling treatment: heating to 1050 ℃ before hot rolling, holding for 1 hour, starting rolling temperature 1000 ℃, final rolling temperature 850 ℃, reduction rate of 20% each time, rolling 9 passes; cold rolling treatment : Heating to 950℃ before cold rolling, holding for 1h, the reduction rate of each time is 5%, rolling 13 passes; the aging treatment temperature is 620℃, the aging time is 10h, and the furnace is cooled to room temperature.

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Abstract

The invention relates to the technical field of light steel, in particular to a method for improving the hydrogen-induced delayed fracture resistance of Fe-Mn-Al-C light steel, comprising the following steps: S1, weighing raw materials according to a preset ratio, high-strength Fe-Mn The chemical composition of ‑Al‑C light steel is as follows: C: 0.9-1.2%, Al: 9.0-11.0%, Mn: 26.0-31.0%, Cu: 1.0-5.0%, and the rest are Fe and impurities; S2. Melt the raw material in a vacuum intermediate frequency induction furnace, cast it into an ingot, and then cool it to room temperature; S3. Forge the cooled ingot, heat it to 1000°C-1100°C before forging, and keep it warm for 1-2 hours , the forging temperature is between 950°C and 1000°C, and after forging, it is air-cooled to room temperature to obtain forged pieces. The invention can effectively improve the hydrogen-induced delayed fracture resistance of the Fe-Mn-Al-C light steel.

Description

technical field [0001] The invention relates to the technical field of lightweight steel, in particular to a method for improving the hydrogen-induced delayed fracture resistance of Fe-Mn-Al-C lightweight steel. Background technique [0002] With the aggravation of the global energy crisis and environmental deterioration, automobiles are the most widely used and frequently used means of transportation in the world, and their energy consumption and pollution problems have attracted the attention of researchers. The automobile industry has become an important part of my country's economy, and energy conservation and emission reduction of automobiles is also one of my country's important measures for environmental protection. [0003] The future development direction of the automotive industry is light weight, high reinforcement, high safety and greening. In the future, automotive steel must have both high strength, high toughness and plasticity, good weldability, formability,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C38/06C22C38/04C22C33/04C21D8/00C21D1/18
CPCC22C38/16C22C38/06C22C38/04C22C33/04C21D1/18C21D8/005Y02P10/20
Inventor 齐艳飞任喜强周景一李运刚李俊国李慧荣高建新王旭峰王程昊
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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