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Method for reducing quenching residual stress of die forging

A technology of residual stress and die forgings, which is applied in the field of reducing the residual stress of die forgings after quenching, can solve problems such as embrittlement and cracking on the surface of forgings, and achieve the effect of improving the heating effect

Pending Publication Date: 2022-07-29
江苏明越精密高温合金有限公司
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Problems solved by technology

[0004] In view of the related technologies mentioned above, the inventor believes that the rapid extreme cold or extreme heat of the forging will cause the rapid thermal expansion and contraction of the forging, which will easily lead to embrittlement and cracking on the surface of the forging

Method used

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  • Method for reducing quenching residual stress of die forging

Examples

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Embodiment 1

[0047] The implementation principle of Example 1 is as follows: first place the forging in a deep freezer to cool the forging until the temperature in the deep freezer drops to -150~-180°C, and keep the temperature for 3~4 hours to complete the cryogenic treatment; Put it into the heating box and let it stand to heat up, and repeatedly use the spray water with increasing temperature to spray the surface of the forging until the spray water reaches 80 ℃, and the temperature of the forging will increase after the spraying; Put it into the heating furnace and heat it back to the furnace at a temperature of 150~180 °C to complete the stress relief. In order to improve the stress relief effect, repeat the above steps again, that is, to complete the stress relief step after the quenching of the die forging.

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Abstract

The invention relates to a method for reducing quenching residual stress of a die forging, which relates to the field of material processing and comprises the following steps: S1, cryogenic treatment of the die forging: putting the die forging into a cryogenic cabinet for cryogenic treatment; s2, staged heating is conducted, specifically, the die forging subjected to deep cooling is placed in a heating box, spraying water is used for conducting spraying heating on the die forging, and spraying is conducted repeatedly; and S3, remelting is conducted, specifically, the heated die forging is put into the heating furnace to be remelted. The method has the effect of improving the defect of embrittlement and cracking of the surface of the forge piece after rapid thermal expansion and cold contraction.

Description

technical field [0001] The present application relates to the field of material processing, and in particular, to a method for reducing the residual stress of die forgings during quenching. Background technique [0002] Die forgings are generally alloy materials. A metal alloy material is commonly used in aviation and other fields. It has the advantages of high strength, high toughness and good corrosion resistance. The die forgings need to be solid-liquid treated at high temperature and manually treated after quenching. In order to obtain die forgings with better comprehensive performance. [0003] In the related art, in the process of quenching and cooling, the temperature difference between the surface and the interior of the forging is large, which will cause residual stress in the forging. At present, the method to eliminate the residual stress is the cryogenic treatment method, and the quenched forging is placed in a deep freezer. Cryogenic treatment is carried out in...

Claims

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Application Information

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IPC IPC(8): C21D6/04C21D1/30
CPCC21D6/04C21D1/30
Inventor 薛仲明浦春燕舒永凯
Owner 江苏明越精密高温合金有限公司
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