Conclusions
-
1.
A forging reduction ratio of 4–6 for the barrel of steam turbine and turbo-generator rotors ensures uniform and high ductility properties and toughness throughout the whole section. The isotropy factors for specimens of the barrel are high (85–95%) and vary slightly between the surface and the center.
-
2.
An increase in the reduction ratio at the journals of steam-turbine rotors to 11 and turbo-generators to 15 (compared with a barrel ratio of 4–6) causes an increase in ductility and toughness in the longitudinal sections and a considerable decline in the transverse specimens. As a result the isotropy factors for the metal of the journal, particularly in the middle, decline to a considerable extent,
-
3.
Quenching of rotors made of 34KhN2M and 34KhN3M steels instead of normalizing, at a certain reduction of the absolute values of the ductility and toughness, increased the isotropy factor.
-
4.
The hydrogen content in the central zone of the forgings (1–2 cm3/100 g) sharply reduces the ductility and elongation and compression isotropy factors. Prolonged soaking of the specimens at room temperature or at 450° for 4 or 6 hours increases the ductility of transverse specimens to satisfactory values, and also increases the isotropy factor. Hydrogen reduces the ductility of the metal in the transverse specimens to a greater extent than in the longitudinal ones.
-
5.
Vacuuming the steel gives it high ductility and a high isotropy factor through the section of the part.
Similar content being viewed by others
References
Kamenskikh, V. N. and other. Forging and heat treatment. Coll. Articles for 25th Anniversary of UZTM, Mashgiz, 1958.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Sklyuyev, P.V. Heat treatment of turbo-generator and steam turbine rotors. Met Sci Heat Treat 4, 120–123 (1962). https://doi.org/10.1007/BF00816356
Issue Date:
DOI: https://doi.org/10.1007/BF00816356