Testing method for rapidly measuring decarburized layer after water passing

Abstract

The invention relates to a testing method for rapidly measuring a decarburized layer after water passing. The testing method comprises steps as follows: sample taking: bearing steel passing water is cut with a metallographic method to obtain a sample; sample preparation: the surface of the sample is ground and polished with the metallographic method; immersion corrosion: the ground and polished sample is immersed in a nitric acid and alcohol solution with the concentration of 3%, the sample is corroded, the corroded sample is cleaned and dried to display the texture structure of the bearing steel; and observation: the corroded sample is observed and measured under an optical microscope. By means of the method, a metallographic evaluating worker can be assisted in performing rapid judgment, normalizing heat treatment for obtaining a hot rolling texture for decarburized layer measurement is not required, and a laboratory can be assisted in rapidly completing the metallographic detection at a high speed; and energy consumption for heat treatment is reduced, environmental protection is facilitated, manual work is further saved, the measurement cost is reduced, the detection period is shortened, and the production efficiency is improved.

Description

technical field [0001] The invention specifically relates to a method for measuring the depth of a decarburized layer of bearing steel, in particular to a method for quickly measuring the decarburized layer after water penetration, and belongs to the technical field of steel testing. Background technique [0002] With the rapid development of the bearing industry, the requirements for the technical level and manufacturing level of bearing steel are getting higher and higher, and high-quality bearing steel is very important in the bearing industry. In recent years, well-known foreign bearing companies, such as SKF, FAG, NSK, etc., have invested a lot in my country, which has greatly promoted the production of bearings and bearing steel in China. In order to quickly control the quality of the product and control the formation of network carbides, many domestic bearing steel manufacturers conduct water penetration treatment on the rolled steel during the production process. The...

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Problems solved by technology

In the process of detecting the depth of decarburization layer, the GB / T224-2008 standard is mainly implemented, which stipulates the method of metallographic method to determine the depth of decarburization layer. When measuring the depth of incomplete decarburization layer, normalizing heat treatment is required to obtain pearlite- Only ferrite structure can be used to measure the depth of decarburization layer, the operation is complex, time-consuming and labor-intensive

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