Rapid detection evaluation method of roller surface layer grain size

Abstract

The invention discloses a detection evaluation method of roller surface layer grain size, and the method is as follows: using a cleaning agent for cleaning a roller to-be-detected region which is treated by surface grinding; preparing a surface wave sensitivity test block with rectangular seamed edges, choosing a surface wave probe with a frequency of 2MHz and an ultrasonic flaw detector, using the sensitivity test block for regulation of ultrasonic flaw detector sensitivity by a surface wave test block end part seamed edge method; setting the sonic path distance of the ultrasonic flaw detector to be 250mm, putting the probe in the roller surface to-be-detected region for well coupling, moving the probe at a uniform speed under the set detection sensitivity, observing waveform display changes of an oscilloscope screen, and acquiring a grass-like echo waveform; and in 20-100% sonic path distance range of the oscilloscope screen, according to the grass-like echo amplitude value, determining the roller surface grain size grade range. The method overcomes the defects of traditional metal grain size detection, improves the detection speed and simplifies the detection process, without restriction of detecting positions and destroying of a specimen, so that the roller quality can be accurately and objectively evaluated.

Description

technical field [0001] The invention relates to a rapid detection and evaluation method for the grain size of the surface layer of a roll. Background technique [0002] Grain size is one of the key indicators for roll manufacturing quality evaluation. Grain size is a technical index that needs to be strictly controlled in metal material processing, especially in thermal processing. The grain size has an important impact on the properties of metal materials. At present, the sample manufactured in the same process is generally used for metallographic inspection by destructive sampling method to test the grain size of the roll. For rolls, the above-mentioned testing methods are complex in process, high in testing costs, and cannot carry out comprehensive quality inspection, and the method of sample testing cannot accurately reflect the real grain size of the roll. [0003] The metallographic inspection methods for the grain size of general metal materials are commonly used wi...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a rapid detection and evaluation method for the grain size of the roll surface layer. This method overcomes the defects of the traditional metallographic inspection method for detecting the grain size of metal, effectively improves the detection speed, and simplifies the detection process. Moreover, the detection position of this method is not limited, and there is no need to destroy the sample, so that the quality of the roll can be evaluated accurately and objectively

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