HEAT TREATMENT METHOD

摘要

A heat treatment method of an impeller includes a heat treatment preparation process of arranging the impeller within a vacuum furnace, an impeller covering process of covering an outer peripheral surface of the impeller in a circumferential direction by a heat uniformizing jig made of a radiation conversion material which radiates transferred heat as radiant heat, and a heat treatment process including a heating process and a cooling process in which heat treatment is performed by heating or cooling the impeller covered with the heat uniformizing jig from the periphery using a heater.

主权项

1. A heat treatment method of a disc-shaped treatment target material, the heat treatment method comprising:
a treatment target material covering process of covering an outer peripheral surface of the treatment target material in a circumferential direction with a covering body made of a radiation conversion material which radiates transferred heat as radiant heat; and a heat treatment process of performing heat treatment by heating or cooling the treatment target material covered with the covering body from the periphery, wherein: the treatment target material is an impeller having an axial hole into which a rotary shaft is capable of being inserted; the heat treatment method further comprises a first insertion process of inserting an axial hole insertion body made of the radiation conversion material into the axial hole; and the heat treatment process is performed in a state in which the axial hole insertion body is inserted into the axial hole.