A method and product for eliminating primary carbides in bearing steel

Abstract

The present invention relates to a method and product for eliminating primary carbides in bearing steel. The method comprises the following steps: radially searching for a position with a certain number of primary carbides in the bearing steel sample as a sampling position; sampling the bearing steel at the sampling position to obtain a test sample; applying a gradient pulse current to the test sample; after the primary carbides are eliminated, stopping the application of the gradient pulse current and cooling the test sample to room temperature. The present invention can completely eliminate primary carbides in a short period of time. Specifically, the Joule heat effect and electromigration effect generated by the pulse current jointly promote the diffusion of vacancies left after the carbides are eliminated, so that it has a much larger vacancy flux than the traditional high-temperature diffusion method, so that the chromium atoms that restrict the dissolution of the primary carbides are quickly redistributed between the carbides and the matrix, saving processing time and avoiding the inheritance of uneven tissue in subsequent processing.

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