Method for detecting nodulizing grade of 12Cr1MoV pearlite on site based on laser plasma spectrum

Abstract

The invention discloses a method for detecting the nodulizing grade of 12Cr1MoV pearlite on site based on a laser plasma spectrum, which covers the shortages that the traditional pipe cutting analysis has destructivity, on-site metallographic phase replica analysis has complex processes, and the requirements on the professional knowledge level and the experience of analysts are high. According to the method, pipe cutting is not needed and mechanical removal and polishing on the surface is also not needed before nodulizing grade analysis is performed on a heated surface pipeline; pulse laser is directly acted on the surface of the pipeline to remove an oxidation layer and a carbon-removing layer of a detected part; and plasma spectral data is acquired and analyzed to obtain the tensile strength sigma b of the measured pipeline material and output the nodulizing grade of the pearlite. The method has the advantages that the measured pipeline is approximately non-destructive; the detection process is simple; the requirements on the professional knowledge level and the experience of the analysts are low; the whole data analysis process is automatically finished by computer program; and the detection efficiency is high.

Description

technical field [0001] The present invention relates to the technical field of analysis methods for pearlite spheroidization grades, in particular to an on-site detection method for 12Cr1MoV pearlite spheroidization grades based on laser plasma spectroscopy. Background technique [0002] 12Cr1MoV steel is mainly used for headers and steam pipes with steam parameters not exceeding 540°C, superheaters and reheater tubes and some castings and forgings with metal wall temperature not exceeding 580°C, with good oxidation resistance and no tendency to heat embrittlement , good welding performance, high durable strength and durable plasticity, etc., its normal metallographic structure is ferrite plus bainite, long-term use under high temperature and high pressure conditions, pearlite (bainite) in the structure will occur The spheroidization phenomenon, that is, the cementite (carbide) in the pearlite (bainite) gradually transforms into granular carbide, and the spheroidization of t...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a kind of on-the-spot detection method of 12Cr1MoV pearlite spheroidization level based on laser plasma spectrum, to make up for the destructiveness of traditional pipe cutting analysis, the cumbersome process of on-site metallographic replica analysis, Deficiencies such as high requirements for analysts' professional knowledge and experience

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