Method for preparing quenching liquid

Abstract

The invention discloses a method for preparing a quenching liquid, and belongs to the technical field of thermal treatment quenching. The quenching liquid consists of a mixture of polypropylene-methacrylic acid and polyacrylamide, a random copolymer of ethylene oxide and propylene epoxide, polyamide polyethylene glycol, a defoaming agent and water. The quenching liquid is mainly applicable to quenching of large-size 35CrMo steel forged shaft pieces, the process is simple, the conventional double-liquid / three-liquid quenching process is changed, by adopting the quenching liquid prepared by using the method disclosed by the invention, the large-size 35CrMo steel forged shaft pieces are effectively prevented from being cracked when being quenched, the quenching effect is good, the defects that the large-size 35CrMo steel forged shaft pieces are insufficient in hardness, not uniform in internal tissue form, easy to crack and the like when being quenched by using ordinary rapid quenching oil are overcome, and the prepared quenching liquid has the advantages of good dispersibility and high storage property.

Description

technical field [0001] The invention belongs to the technical field of heat treatment and quenching, and more specifically relates to a method for preparing a quenching liquid. Background technique [0002] The earliest historical records of the quenching process can be found in the "Clear Water Quenching its Peak" in "Han Shu·Wang Bao Biography". In 1863, a British metallographer and geologist showed six different metallographic structures of steel under a microscope, proving that when steel is heated and cooled, the internal structure will change, and the phase at high temperature in the steel will transform when it is quenched as a harder phase. Therefore, metals usually use heat treatment to improve the strength and metallographic structure of the metal to obtain the desired properties, and the quenching medium is one of the key factors to obtain high quenching quality. Commonly used quenching mediums include brine, water , mineral oil, air, etc. The traditional water...

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Problems solved by technology

[0006] In the prior art, there is no suitable method for preparing a quenching agent for large-scale shaft forgings made of 35CrMo steel, and the quenching liquid prepared by a common quenching liquid preparation method has poor quenching effect on large-scale shaft forgings made of 35CrMo steel, insufficient hardness after quenching, and internal structure. Inhomogeneous, prone to cracking, high cost and other problems, the present invention provides a preparation method of quenching liquid, the cooling rate of the quenching liquid obtained by the preparation method of the present invention is slightly higher than that of quenching oil in the high temperature stage and close to ordinary distilled water, and the cooling rate at Ar1 temperature Quenching liquid that is very slow, close to fast oil, can make the large-scale shaft forgings made of 35CrMo steel after normalizing, and the surface of the large shaft forgings after quenching is evenly cooled when it is quenched. The heat transfer is slow at the low temperature stage, effectively releasing the tissue stress and preventing quenching cracking