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High-strength plastic product automobile part hot stamping and carbon partition integrated process

A technology of auto parts and high-strength plastic products, which is applied in the direction of forming tools, manufacturing tools, metal processing equipment, etc., can solve the problems of increasing equipment and energy consumption, increasing the difficulty of process realization, and application restrictions, so as to save energy consumption and improve Anti-collision safety performance, the effect of improving safety

Inactive Publication Date: 2015-05-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the hot stamping integration process based on Q&P has been developed, it is difficult to be compatible with the industrial hot stamping production process. The main reason is that the carbon distribution process requires an independent isothermal process, which requires more equipment and energy consumption.
Moreover, due to the short time required to transfer to the distribution equipment, usually within a few seconds, this increases the difficulty of the realization of the process, thus greatly limiting its application

Method used

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  • High-strength plastic product automobile part hot stamping and carbon partition integrated process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, the sheet is heated to 890°C for austenitization for 5 minutes, and then transferred to the mold for hot stamping within 10 seconds. The pressure in the mold is maintained for 5 seconds to complete quenching, and the mold is released at 310°C. cooling rate to room temperature.

[0034] The mechanical performance test results show that the tensile strength of the steel is 1630MPa, the elongation is 15.99%, and the strength-plasticity product is 26070MPa·%, which reach the mechanical performance index of Q&P steel after the above process.

[0035] Such as figure 1 As shown, the XRD results show that the volume fraction of retained austenite in the sample after the above treatment is 6.5%, indicating that the good plasticity of the box-shaped part is due to the contribution of a certain amount of relatively stable retained austenite phase.

Embodiment 2

[0037] In this example, the sheet is heated to 890°C for austenitization for 5 minutes, and then transferred to the mold for hot stamping within 10 seconds. The pressure in the mold is maintained for 5 seconds to complete quenching, and the mold is released at 300°C. The average cooling rate is cooled to room temperature.

[0038]The test results of mechanical properties show that after the above process, the tensile strength of the box-shaped part is 1610MPa, the elongation is 15.99%, and the strength-plasticity product is 25717MPa·%, reaching the mechanical performance index of Q&P steel.

[0039] Such as figure 1 As shown, the XRD results show that the volume fraction of retained austenite in the sample after the above treatment is 4.3%, indicating that the good plasticity of the box-shaped part is due to the contribution of a certain amount of relatively stable retained austenite phase.

Embodiment 3

[0041] In this example, the sheet is heated to 920°C for austenitization for 5 minutes, and then transferred to the mold for hot stamping within 10 seconds. The pressure in the mold is maintained for 5 seconds to complete quenching, and the mold is released at 290°C. The average cooling rate is cooled to room temperature.

[0042] The test results of mechanical properties show that after the above process, the tensile strength of the box-shaped part is 1600MPa, the elongation is 14.87%, and the strength-plastic product is 23790MPa·%, reaching the mechanical performance index of Q&P steel.

[0043] Such as figure 1 As shown, the XRD results show that the volume fraction of retained austenite in the sample after the above treatment is 4.8%, indicating that the good plasticity of the box-shaped part is due to the contribution of a certain amount of relatively stable retained austenite phase.

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Abstract

The invention relates to the field of advanced high-strength steel for automobiles, in particular to a high-strength plastic product automobile part hot stamping and carbon partition integrated process. A steel sheet is heated to be totally austenitized, then the heated steel sheet is transferred to a hot stamping device instantly, stamping and forming and quenching in a die are conducted, after the steel sheet is taken out of a furnace, the steel sheet is cooled to the room temperature at a certain cooling speed, the steel sheet is made to generate carbon partition, accordingly residual austenite is stabilized, and finally hot stamping parts with martensite and a stabilized residual austenite dual-phase structure are obtained. According to the high-strength plastic product automobile part hot stamping and carbon partition integrated process, on the basis of maintaining advantages of a hot stamping integrated process based on a Q&P process, the defect that an independent isothermal partition device is needed or long-time heat preservation is required in the die is overcome, production efficiency is improved, and energy consumption is saved; The obtained parts are high in strength and high in elongation percentage as well, strength and ductility product of the parts is increased, and thus the anti-collision safety performance of the parts is improved.

Description

technical field [0001] The invention relates to the field of advanced high-strength steel for automobiles, in particular to an integrated process of hot stamping carbon partitioning (Hot Stamping-Dynamic Partitioning, HS-DP) for high-strength plastic product automobile parts. Background technique [0002] The use of advanced high-strength steel is one of the important means of automobile lightweight. At present, advanced high-strength steel (such as: boron steel 22MnB5) often adopts hot stamping process. The process principle is to quickly transfer the workpiece to the mold after austenitization, and carry out During the stamping and pressure quenching process, the quenched martensite structure is obtained under the cooling rate of >30°C / s, the tensile strength is 1500MPa, the plasticity is only about 6%, and the strong plasticity product is about 9000MPa·%. [0003] Q&P (Quenching&Partitioning) steel is a low-carbon martensitic steel with high strength and certain plasti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/02B21D37/16C21D8/00
CPCB23P15/00B21D22/02B21D37/16C21D8/00
Inventor 张士宏宋鸿武程明张飞豹
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI