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Heat treatment process for improving strength and toughness of 9SiCr die steel

A process method and die steel technology, applied in the field of heat treatment process, die steel heat treatment process, can solve the problems of not having the best comprehensive performance, strength and toughness can not have both, to achieve the change of strength and toughness, the improvement of mechanical properties, and the improvement of The effect of comprehensive performance

Inactive Publication Date: 2011-11-02
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

The above two final treatment methods make the strength and toughness of the material unable to have both under the conventional treatment process.
Not the best overall performance

Method used

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  • Heat treatment process for improving strength and toughness of 9SiCr die steel

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Embodiment

[0017] After the main mechanical forming of the 9SiCr mold is completed, the spheroidizing annealing preheating treatment is carried out. The method is: heating to 790-810°C and holding it for 1-2 hours, then lowering it to 700-720°C for a certain period of time, and finally cooling it to 550°C and leaving the furnace. Air cooling, the hardness after treatment is 197~241HBS. Then final heat treatment: heating in salt bath to 900°C for austenitization, isothermal oil quenching at 230-250°C, pre-tempering at 200°C for 1 hour; deep cooling at -160-190°C for 24 hours, and then tempering at 200°C for 2 hours . In the cryogenic treatment, liquid nitrogen is used as the cryogenic medium, rapidly cooled from room temperature to the liquid nitrogen temperature zone (-130~-190°C), kept for 24 hours or more, then taken out and placed at room temperature, until the temperature returns to room temperature .

[0018] Gained die steel mechanical properties and performance technical paramet...

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Abstract

The invention discloses a heat treatment process for improving the strength and toughness of 9SiCr die steel. The 9SiCr die steel is subjected to the final heat treatment after preheating treatment. The final heat treatment comprises the following steps of: heating to 880-920 DEG C for austenization, performing isothermal oil quenching at 230-260 DEG C, pre-tempering for 1 hour at 160-200 DEG C, then performing cryogenic treatment for at least 24 hours at a temperature between -130 DEG C and -190 DEG C, and finally tempering for 2 hours at 180-200 DEG C. With the process provided by the invention, the hardness value of a die is increased as compared with that of the isothermal quenching and tempering process and close to that of the quenching and tempering process; the impact toughness of the die is greatly increased as compared with those of the isothermal quenching and tempering process and the quenching and low-temperature tempering process and increased by 2 to 3 times as compared with that of the isothermal quenching and tempering process. Besides, both the wear-resistant property and the service life of the die are greatly improved.

Description

technical field [0001] The invention belongs to heat treatment technology, especially the technical field of mold steel heat treatment technology. Background technique [0002] Mold is an important process equipment in industrial production. Under the background of modern mechanized mass production, mold is becoming more and more important to mass production of enterprises. It determines the quality, efficiency and development of new products to a large extent. ability. With the development of science and technology and the improvement of industrial production level, the development of the mold industry provides a strong guarantee for the high-efficiency production of enterprises. [0003] 9SiCr material is a commonly used tool steel and die steel, which has high hardenability and hardenability, and high tempering stability. Therefore, 9SiCr material is widely used to process various tools and molds with complex shapes and small deformation. [0004] The commonly used tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/78
Inventor 董立新周友龙刘力菱欧活军钱梁
Owner SOUTHWEST JIAOTONG UNIV
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