| Abstract: | | 1. | The proposed regime for heat treating high-speed steels (TDH) increases their mechanical properties and decreases distortion in tools manufactured from them. It also decreases the treatment time. | | 2. | The TDH process specifies cooling of the tool from the hardening temperature to a temperature lower than MI but higher than 20°C. This is followed by heating to 600–630°C (in order to obtain the greatest increase, in mechanical properties) or to 500°C (in order to obtain the least amount of distortion) followed by air cooling. After TDH only one temper at 560°C for 1 h is necessary. | | 3. | The proposed thermal treatment process is based on the intense emission of alloying elements and carbon from the residual austenite during its recrystallization. | | 4. | The TDH process is most effective for cutting tools of small size, and also for dies of complex shape. |
Moscow Machine Tool Institute, I. P. Bardin TsNIIChERMET. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 24–29, May, 1989. |
