Method for determining corresponding retained austenite content during bearing steel material thermal processing

Abstract

The invention discloses a method for determining corresponding retained austenite content during bearing steel material thermal processing. The method includes: measuring the corresponding specific volume of a to-be-determined bearing steel material under different thermal processing states, performing an X-ray experiment on the bearing steel test sample obtained through electrolytic polishing and sample preparation to obtain the retained austenite content, and using the retained austenite content as the horizontal coordinate and the specific volume of the to-be-determined bearing steel material as the longitudinal coordinate to build a relationship, namely a working curve, between the retained austenite content and the specific volume of the to-be-determined bearing steel material; quantitatively determining the corresponding retained austenite content of the to-be-determined bearing steel material under one thermal processing state according to the obtained working curve and the position of the specific volume of the to-be-determined bearing steel material in the working curve or by comparing the specific volume under different thermal processing states. The method is simple in test sample preparation, universal in measuring instrument, convenient to operate, high in experiment data precision, high in repeatability, reliable in data, and the like.

Description

technical field [0001] The invention belongs to the field of physics, and relates to a method for measuring the content of retained austenite, in particular to a method for measuring the content of retained austenite corresponding to the heat treatment process of bearing steel materials. Background technique [0002] In finished bearing parts, especially precision bearing parts, there are strict requirements on dimensional stability. Retained austenite is an unstable phase in Cr-containing steel such as bearing steel. It will undergo a phase transformation of volume change during the storage or use of finished parts. This transformation will lead to dimensional changes in the bearing and affect the accuracy of the bearing. It can even lead to scrapping. Therefore, accurate measurement and control of retained austenite is a key technology to ensure the dimensional stability of bearing parts and thus the normal use of bearings. [0003] Theoretical calculations show that for...

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Problems solved by technology

[0005] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for measuring the corresponding residual austenite content in the heat treatment process of the bearing steel material. The corresponding residual austenite content in the heat treatment process of the bearing steel material is The determination method of content should solve the technical problems of high cost and long analysis and measurement process of measuring retained austenite content by X-ray diffraction method in the prior art

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