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A steel with pronounced spheroidal carbides is a steel that has a consistent melting temperature above A. sub. 1's transformation temperature, soaking the steel above the A. sub. 1 surface for a long time until the majority of the carbides dissolve into the austenite matrix, and then cooling the steel in a controlled manner within predetermined limits of cooling rate or transformation temperature, resulting in a steel with a steel with a significant number of spheroidal carbides.
Source link: https://www.osti.gov/biblio/870047
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