Abstract
1. A considerable difference in grain size is found in quenched high-speed steel R6M5K5 even within the same sample. 2. The average grain size varies with the size of excess carbides, while the difference in grain size varies with the distribution of carbides. 3. With the same grain size the difference in grain size decreases with decreasing temperatures and increasing holding times during austenitizing. 4. To eliminate differences in the grain size of large tools (diameter 50–100 mm) of high-alloy steels it is expedient to use steel obtained by P/M techniques.
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