Quantitative statistical method for sigma phase in austenitic heat-resistant steel

By employing a combination of two mechanical polishing processes and one electrolytic polishing process, along with perchloric acid and glacial acetic acid electrolytes and an EBSD probe, the quantitative statistical problem of the Sigma phase in austenitic heat-resistant steel was solved, achieving efficient and accurate Sigma phase quantification while reducing costs and time.

CN122109153APending Publication Date: 2026-05-29DATANG BOILER & PRESSURE VESSEL INSPECTION CENTER CO LTD +3
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Patent Information

Application Number
CN202610103789.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-26
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies are difficult to efficiently and accurately quantify the Sigma phase in austenitic heat-resistant steel. Traditional methods suffer from problems such as easy dissolution of the Sigma phase, reliance on experience in operation, and low resolution.

Method used

The method employs two mechanical polishing steps and one electrolytic polishing step. An electrolyte solution prepared with perchloric acid and glacial acetic acid in a 1:3 ratio is used for electrolytic polishing in an ice-water mixture constant temperature bath. Image data is acquired using an EBSD probe with an appropriate acquisition step size set.

Benefits of technology

It achieves efficient and accurate quantitative statistics of sigma phase with a resolution of over 95%, reducing polishing time and cost and improving quantitative accuracy.

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Abstract

The invention provides a quantitative statistical method for sigma phase in austenitic heat-resistant steel, which comprises the following steps of: firstly, linearly cutting a sample according to the sample size requirement of an electron microscope; grinding and polishing the sample; after polishing is completed, the sample is subjected to electrolytic polishing; after electrolytic polishing, the sample is cleaned and blow-dried, and finally image data acquisition is carried out. The electrolytic polishing method has the advantages that the electrolytic polishing method suitable for EBSD characterization of the austenitic heat-resistant steel with sigma phase precipitation is provided, perchloric acid and glacial acetic acid with the purity being 70-72% are innovatively mixed according to the proportion of 1: 3 to prepare the electrolyte, the electrolyte is placed in a thermostatic bath of an ice-water mixture to be subjected to electrolytic polishing, and it is found through experiments that the electrolytic polishing method is suitable for EBSD characterization of the austenitic heat-resistant steel with sigma phase precipitation. The sample under the condition is subjected to electrolytic polishing, the sigma phase of the sample cannot be dissolved and fall off, and the defect that the sigma phase is likely to fall off and be dissolved due to traditional stainless steel electrolytic polishing is overcome.
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