| 摘要 |
Process for heat treating metallic workpieces comprises: heating workpieces to a first temperature in a vacuum or in a neutral or reducing gas atmosphere; carburizing the workpieces at the first temperature reached at the end of the heating up phase; cooling the workpieces to a second temperature; boriding the workpieces; cooling the workpieces to third temperature; and quenching the workpieces. Process for heat treating metallic workpieces comprises: heating the workpieces to a first temperature in a vacuum or in a neutral or reducing gas atmosphere during the heating up phase; carburizing the workpieces at the first temperature reached at the end of the heating up phase and at a first pressure for a first time period in a gas atmosphere containing a hydrocarbon during an enriching phase next to the heating up phase; cooling the workpieces to a second temperature; boriding the workpieces; cooling the workpieces to a third temperature; and quenching the workpieces from the third temperature to a temperature of less than 150 degreesC. Independent claims are also included for the following: (a) a device for carrying out the heat treating process; and (b) a heat treated workpiece. Preferred Features: The workpieces are heated in the first step to 800-1100 degreesC and cooled to 800-950 degreesC. The workpieces are cooled to room temperature during quenching. During boriding, the gas atmosphere contains boron trichloride, boron trifluoride and/or diboran. |
