Martensitic steel copious cooling and high-pressure twisting mold and method

A technology of martensitic steel and high-pressure twisting, which is applied in the field of martensitic steel cryogenic and high-pressure twisting molds, can solve the problems of uniform and finer grains of high-strength steel and shorten the heat treatment time of high-strength steel, so as to improve mechanical properties, Increased elongation and restrained dynamic recovery

Active Publication Date: 2020-09-04
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no further research has been done on the uniform refinement of USIBOR1500 martensitic high-strength steel grains and shortening the heat treatment time of high-strength steel.

Method used

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  • Martensitic steel copious cooling and high-pressure twisting mold and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the present embodiment provides a martensitic steel cryogenic high-pressure rotary die, the die includes an upper die and a lower die, the upper surface of the lower die is provided with a cylindrical groove; the groove just covers The upper mold does not form constraints on the upper mold; a sealing structure 3 is provided between the upper mold and the lower mold. The sealing structure 3 includes a sealing ring, and the sealing ring is arranged at the opening of the groove. The sealing ring is fixed on the opening of the groove through a pressure ring, and the liquid nitrogen in the groove is isolated from the outside through the sealing structure 3, so as to prevent the gasification loss of the liquid nitrogen and achieve the best cryogenic treatment effect.

[0028] In this embodiment, the mold material is cemented carbide.

Embodiment 2

[0030] Put the 1.8mm thick USIBOR1500 martensitic high-strength steel sheet sample 5 into the groove of the lower mold 2, the upper mold 1 presses down on the sample 5, fills the groove with liquid nitrogen 4, and then puts the upper mold 1 The mold and the lower mold are sealed, and the sample is subjected to cryogenic treatment for 20 minutes. After the cryogenic treatment of the sample, high-pressure twisting is performed under a pressure of 4GPa, that is, the lower mold is turned, and the rotation angle is 360°. Then anneal and recrystallize at 750°C in a spark plasma sintering machine, the holding time is 20 minutes, and air cool after the holding.

Embodiment 3

[0032] Put the 1.6mm thick USIBOR1500 martensitic high-strength steel sheet sample 5 into the groove of the lower mold 2, the upper mold 1 presses down on the sample, fills the groove with liquid nitrogen 4, and then puts the upper mold It is sealed with the lower mold, and the sample is subjected to cryogenic treatment for 20 minutes. After the cryogenic treatment of the sample, high-pressure twisting is carried out under the pressure of 5GPa, that is, the lower mold is turned, and the rotation angle is 360°. Then anneal and recrystallize at 750°C in a spark plasma sintering machine, the holding time is 20 minutes, and air cool after the holding.

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Abstract

The invention discloses a martensitic steel copious cooling and high-pressure twisting mold and method, and relates to the technical field of high-strength steel fine grain treatment. A mold with a groove formed in a lower mold is adopted, a USIBOR1500 martensitic high-strength steel plate is contained in liquid nitrogen in the groove of the lower mold, an upper mold descends to be pressed on theplate, the groove of the lower mold is filled with liquid nitrogen, then the upper mold and the lower mold are sealed, copious cooling treatment is carried out on a sample, and the treatment time is 20 min or 30 min; after copious cooling treatment, high-pressure twisting is carried out under the pressure being 4 GPa or 5 GPa, and the twisting angle is 360 degrees; and the USIBOR1500 martensitic high-strength steel plate subjected to copious cooling treatment of different processes and high-pressure twisting is subjected to vacuum electric field assisted recrystallization annealing treatment,the temperature is 750 DEG C, the soaking time is 20 min, and air cooling is carried out after heat preservation is finished. Grains of finally-prepared USIBOR1500 martensitic high-strength steel areeven tiny martensitic grains, and the yield strength, tensile strength and ductility of the steel are all improved to a certain degree by being compared with steel before treatment.

Description

technical field [0001] The invention relates to the technical field of fine-grain treatment of high-strength steel, in particular to a martensitic steel deep-cooling and high-pressure twisting die and a method. Background technique [0002] Advanced high-strength steel is a material with a multi-phase structure. The desired chemical composition and multi-phase microstructure are achieved through strict control of heating and cooling processes, and various strengthening mechanisms are used to achieve different strengths, ductility, toughness and fatigue properties. It is widely used in the automobile industry. USIBOR1500 high-strength steel is a commonly used high-strength steel material. This kind of steel can finally obtain a martensitic steel with a strength exceeding 1500MPa through phase transformation. [0003] Zhu Le studied the hot stamping process of USIBOR1500 high-strength steel plate, and at the same time analyzed the conditions for the formation of martensite in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/04C21D8/02C21D1/26C21D1/04
CPCC21D1/04C21D1/26C21D6/04C21D8/0221C21D8/0273C21D2211/008
Inventor 骆俊廷肖遥崔天伦张丽丽张春祥
Owner YANSHAN UNIV
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