Control method for nickel-based alloy forgings for 700-DEG C ultra-supercritical steam turbine rotor

• Main Authors: NIE YIHONG, ZHU HUAISHEN, ZHAO SHUAI, WANG BAOZHONG, BAI YAGUAN, WU YUN
• Format: Patent
• Language: Chinese; English
• Published: 07.09.2016
• Subjects: ALLOYS; CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a control method for nickel-based alloy forgings for a 700-DEG C ultra-supercritical steam turbine rotor. According to the control method, a stepped heating method is adopted for homogenizing heat treatment, steps are arranged at 700-800 DEG C and 1110-1150 DEG C, and heat is insulated for 2-3 hours and 5-9 hours respectively until a core part achieves the temperature; room temperature is slowly risen to 700-800 DEG C at a speed of 40 DEG C/hour; a high-temperature long-time heat insulation phase of insulating heat for 20-50 hours until the core part achieves the temperature at 1180-1220 DEG C is specially designed; forging temperature intervals are strictly controlled, an initial forging temperature is 1120-1190 DEG C, and a final forging temperature is 880-980 DEG C; a stepped temperature rising method is adopted for solid solution heat treatment, the room temperature is risen to 700-800 DEG C at the speed of 40 DEG C/hour, heat is insulated for 2-3 hours until the core part achieves