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Q&P steel with gradient structure and manufacturing method thereof

A technology of gradient structure and structure, which is applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of not considering the macro structure distribution of steel parts, not forming gradient micro structure, etc., so as to ensure process stability Sex and tissue gradient, the effect of high-strength plastic product

Inactive Publication Date: 2016-04-06
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, J.G.Speer et al published the article "Quenched and Partitioned Microstructures Produced via Gleeble Simulations of Hot-StripMill Cooling Practices" in Metallurgical and Materials Transactions A, 2011, 42(12), 3652-3659. It is pointed out that it is effective to improve the strength and toughness of Q&P steel by hot rolling at high temperature, but it does not consider steel parts The distribution of macrostructure, no gradient microstructure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The composition and weight percentage of the steel in the embodiment of the present invention are: C: 0.15%, Si: 2.11%, Mn: 1.80%, Cr: 0.9%, Al: 3.0%, S: 0.0065%, P: 0.0078%, and the rest For Fe.

[0049] The steel is selected from thin lath martensitic steel containing high-density dislocations.

[0050] First, the steel is rapidly heated to the austenitizing temperature (850°C) and isothermally held for 10 minutes to fully austenitize; then the surface is carburized at 740°C, and the carburizing time is 10 hours. The whole carburizing process should be carried out with nitrogen as the atmosphere ;Quickly quench to a quenching temperature of 300°C between Ms and Mf, and keep it in a nitrogen atmosphere for 3h within this temperature range. Then carbon partitioning is carried out at a certain tempering temperature of 330°C for 10 minutes; finally, it is quenched to room temperature, and a gradient multiphase structure of stable martensite and retained austenite is obta...

Embodiment 2

[0053] The composition and weight percentage of steel in the embodiment of the present invention are: C: 0.18%, Si: 2.01%, Mn: 2.03%, Cr: 0.9%, Al: 2.5%, S: 0.0053%, P: 0.0068%, and the rest For Fe.

[0054] First, the steel is rapidly heated to the austenitization temperature (900°C) and isothermally maintained for 8 minutes to fully austenitize; then the surface is carburized at 770°C, and the carburization time is 15 hours. The whole carburization process should be carried out with nitrogen as the atmosphere. ;Quickly quench to a quenching temperature of 350°C between Ms and Mf, and keep warm in a nitrogen atmosphere for 3h within this temperature range. Then carry out carbon distribution at a certain tempering temperature of 400°C for 10 minutes. Finally, it is quenched to room temperature, and a gradient multiphase structure of stable martensite and retained austenite is obtained at room temperature.

[0055] After testing, the tensile strength Rm of the steel core is 1...

Embodiment 3

[0057] The composition and weight percentage of the steel in the embodiment of the present invention are: C: 0.21%, Si: 1.16%, Mn: 2.32%, Cr: 1.1%, Al: 1.6%, S: 0.0051%, P: 0.0069%, and the rest For Fe.

[0058] First, the steel is rapidly heated to the austenitizing temperature (900°C) and isothermally held for 15 minutes to fully austenitize; then the surface is carburized at 800°C, and the carburizing time is 20 hours. The whole carburizing process should be carried out in an atmosphere of nitrogen ;Quickly quench to a quenching temperature of 400°C between Ms and Mf, and keep it in a nitrogen atmosphere for 4h within this temperature range. Then carry out carbon distribution at a certain tempering temperature of 420°C for 10 minutes. Finally, it is quenched to room temperature, and a gradient multiphase structure of stable martensite and retained austenite is obtained at room temperature.

[0059] After testing, the tensile strength Rm of the steel core is 1415MPa, and t...

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Abstract

The invention discloses Q&P steel with a gradient structure. The Q&P steel comprises, by weight percent, 0.14-0.29% of C, 1.1-2.8% of Si, 1.8-3.0% of Mn, 0.5-1.9% of Cr, 1.5-3.1% of Al, smaller than or equal to 0.01% of S, smaller than 0.01% of P and the balance Fe. A manufacturing method of the Q&P steel includes the steps of austenitizing, carburizing, quenching, tempered carbon distributing and quenching. According to the Q&P steel and the manufacturing of the Q&P steel, technology stability and organization gradient can be ensured in production of large-size products, strength of the steel is improved, good toughness of the steel is also ensured, and low alloying cost is low.

Description

technical field [0001] The invention relates to a Q&P steel with gradient structure and a preparation method thereof, belonging to the technical field of metal materials. Background technique [0002] In order to meet the dual requirements of light weight and high safety for the future development of the automobile industry, automobile steel continues to develop in the direction of high strength and high plasticity, and the product of strength and plasticity has become an important indicator to measure the performance of automobile steel. The strength-plasticity product of the first-generation automotive sheet steel is generally 15GPa%, and the light weight and safety indicators are very low; although the strength-plasticity product of the second-generation automotive steel reaches 50GPa%, its cost is high, the process performance is poor and Metallurgical production is more difficult. The so-called third-generation automotive steel refers to high-strength, high-plastic ste...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/18C21D6/00C21D1/20C23C8/22C23F17/00
CPCC21D1/20C21D6/002C21D6/005C21D6/008C21D2211/001C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/18C23C8/22C23F17/00
Inventor 刘和平姬秀芳王志云刘斌白培康李大赵李志勇孙凤儿唐宾林乃明
Owner ZHONGBEI UNIV
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