METHOD FOR THERMAL PROCESSING OF PARTS MANUFACTURED FROM REFRACTORY NICKEL-BASE ALLOYS Russian patent published in 2004 - IPC

FIELD: thermal processing of metals, in particular, thermal processing of products from refractory nickel-base alloys having equiaxial, oriented and monocrystalline structure.

SUBSTANCE: method involves three stages, with first stage including heating parts manufactured from refractory nickel-base alloy to temperature within temperature range of (t_fs-t_eut), holding and cooling at cooling rate exceeding 100⁰/min; second stage including heating to temperature within temperature range of (t_is-t_fs), where t_fs is temperature of full solving of γ'-phase, t_eut is temperature of solving of eutectics (γ+γ'), t_is is temperature of initial solving of γ'-phase, holding and cooling at cooling rate exceeding 100⁰/min; third stage including heating to temperature approximating t_is, holding and cooling, with heating rate at all stages being greater than 100⁰/min, holding time being up to 300 s and cooling at third stage being performed at cooling rate exceeding 100⁰/min; repeating each stage several times; after third stage, providing additional annealing process at temperature below t_r, where t_r is temperature of regulation of γ-solid solution. Method allows sizes, shape and distribution of particles of γ'-phase and structure of γ- and γ'-solid solutions to be provided, which enable high level of operating characteristics of nickel-base alloys with equiaxial, oriented or monocrystalline structure.

EFFECT: improved operating characteristics of alloys produced and substantially reduced thermal processing time.

2 cl, 3 dwg, 1 ex