Patent ID: 6939419

Claim:
A method for producing axially symmetric parts from multiphase alloys comprising the steps of: (a) shaping an axially symmetric billet of the part being produced by rolling the billet, while rotating about its own axis, with at least one roll which has at least three degrees of freedom, under controlled conditions for shaping the billet being processed, the conditions including strain-temperature-and-rate, the billet temperature, the load application pattern and the value of the load applied, the conditions determining the level of internal stresses in the billet and the level of the material strain resistance, at a billet temperature above 0.4 melting point of the multiphase alloy but below a temperature at which a total content of precipitates or an allotropic modification of a matrix of the multiphase alloy is not below about 7%, with a tool load of q of the roller, and meeting the following conditions: σ SH >q≧σ SΔ K·σ Sη >q where: σ SΔ is the yield stress of the material of the billet portions subject to deformation; σ SH is the strain resistance of the material of the billet portions not subject to deformation; K≦2, is an empirical coefficient; and σ Sη is the strain resistance of the tool material at a strain temperature of the billet under process; with the strain rate in the range from about 10 2 to about 10 −3 s −1 ; and then heating the part to a temperature above or below a dissolution temperature of a second phase or allotropic modification depending on a microstructure of the material of the axially symmetric part resulting from the rolling procedure.