| 摘要 |
<p>The invention provides a carburizing and quenching method, wherein the machining time of the carburizing process is shortened, while no cracks are generated and mechanical properties are maintained. The carburizing and quenching method is used for carburizing and quenching a workpiece to be machined and made of surface hardened steel. The carburizing and quenching method comprises a heating process, wherein a workpiece to be machined is heated to the treatment temperature of a 1050 to 1350 DEG C; a carburizing process, wherein the workpiece to be machined is maintained at the treatment temperature and the surface carbon concentration of the workpiece is adjusted to be less than the JE line or the carburizing atmosphere of the JE line for being subjected to carburizing treatment. Meanwhile, the carbon concentration of the diffusion layer of the carbon diffusion range is arranged to be below 0.6wt% through carburizing treatment; a primary quenching process, wherein the temperature of the workpiece is lowered to a described quenching temperature so as to be subjected to quenching treatment; a warming process, wherein the workpiece is maintained below 1000 DEG C and higher than the A3 line; and a secondary quenching processes, wherein the quenching is performed after the warming process.</p> |
