| 摘要 |
FIELD: technological processes. ^ SUBSTANCE: invention can be used at manufacture of preforms for details of gas-turbine drives from high-alloy nickel alloys with the amount of gamma-phase exceeding 25%. Obtain initial preforms from measured preforms in the form of a bar of the big section with a rectangular cross-section by upsetting, punching, cutting-out and spacing of the diameter. Before punching, the jumped preforms are shifted in overaged condition. For this purpose heat them in the furnace for hardening to the temperature exceeding on 10...30C temperature of full dissolution of gamma-phase of a nickel alloy. Then the preforms are conditioned for 0.5...2 hours and slowly cooled with speed of 0.5...1.0 deg/minute to the temperature of 950...900C, conditioned at this temperature and further cooled on air. Before punching a preform is heat in the heating furnace at temperature 1000...950C within 1...2 hours. The received initial preforms are thermal processed in overaged condition also heat for rolling-off to overaging temperatures. The rolling-off is performed on a ring-rolling mill in one - three operations. The unrolled preforms are thermal processed in overaged condition and gauged according diameter in heated condition. ^ EFFECT: quality increase of the obtained preforms due to provision of punching of an optimum hole and crack formation exception during spacing. ^ 2 cl, 2 dwg |
