Manufacturing method for reverted austenite hot-stamped steel plate

Abstract

The invention relates to a manufacturing method for a reverted austenite hot-stamped steel plate. The method comprises the following steps: (1) heating materials to a certain temperature of greater than Ac3 (a finishing temperature of austenite transformation) at a certain heating speed and insulating heat for a certain time; (2) carrying out primary quenching: transferring a steel plate into a stamping die and carrying out hot-stamping formation, and then carrying out water quenching to achieve room temperature; (3) carrying out heat insulation in a reverted austenite area: re-heating the steel plate quenched to the room temperature to a certain temperature between As (a beginning temperature of reverted austenite formation) and Ac1 (a beginning temperature of austenite transformation) and keeping constant temperature for a period of time; (4) carrying out secondary quenching: rapidly quenching the steel plate to a certain temperature between Ms (a beginning temperature of martensite phase transformation) and Mf (a finishing temperature of martensite phase transformation) and insulating heat for a certain time; (5) partitioning: heating the steel plate to a temperature of greater than Ms and insulating heat for element partitioning; and (6) carrying out tertiary quenching: quenching the steel plate to room temperature.

Description

Technical field [0001] The invention relates to a method for improving the mechanical properties of a hot stamping steel plate, in particular to a method for manufacturing a reversed austenitic hot stamping steel plate. Background technique [0002] Theoretical analysis and test results show that: the lightweight of automobiles is an effective way to improve the fuel economy of automobiles, because the weight of the entire automobile is reduced by 10%, and the fuel efficiency can be increased by 6% to 8%; Kilometers can reduce fuel consumption by 0.3~0.6L. Therefore, due to the needs of environmental protection and energy saving, the lightweight of automobiles has become a major trend in the world's automobile development. [0003] In the 1990s, 35 major steel companies around the world cooperated to complete the "ULSAB-Ultra Light Steel Auto Body" project. The research results of this subject show that if 90% of automobile body steel plates are used in mass-produced high-strength...

AI Technical Summary

Problems solved by technology

[0004] Although the lightweight materials of automobiles have been extended to magnesium alloys, aluminum alloys, and plastics other than advanced high-strength steel (AHSS), these materials will either greatly increase the production cost of automobiles, or they cannot meet the burden. Therefore, judging from the current development trend, AHSS is still a reliable, easy-to-implement, and irreplaceable lightweight material for automobiles, and applying the hot stamping process to actual production Solved the problem of poor formability of advanced high-strength steel, therefore, AHSS still has great potential in the lightweight of automobiles

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