Metal treatment – Process of modifying or maintaining internal physical... – Carburizing or nitriding using externally supplied carbon or...
Patent
1995-06-28
1996-11-12
Sheehan, John
Metal treatment
Process of modifying or maintaining internal physical...
Carburizing or nitriding using externally supplied carbon or...
148210, 148212, 148217, 148219, 148224, C23C 820
Patent
active
055736041
ABSTRACT:
The process serves for the manufacture of an erosion-resistant turbine blade which is preferably used in the low-pressure stage of a steam turbine and is made of a vanadium-containing (.alpha./.beta.)-titanium base alloy. This involves the formation, by remelt alloying of a blade section which is situated in the region of the blade tip and comprises the leading edge of the blade, in a boron-, carbon- and/or nitrogen-containing gas atmosphere, with the aid of a high-power energy source, of an erosion-resistant protective layer made of a titanium boride, titanium carbide and/or titanium nitride. The remelt alloyed blade section is subjected to a heat treatment at a temperature between 600.degree. and 750.degree. C. with the formation of a vanadium-rich .beta.-titanium phase. As a result of the heat treatment and the attendant microstructural change, the fatigue strength of the turbine blade in the region of the protective layer is considerably improved while the erosion resistance of the untreated protective layer is virtually retained.
REFERENCES:
patent: 5141574 (1992-08-01), Takahashi et al.
patent: 5330587 (1994-07-01), Gauigan et al.
patent: 5413641 (1995-05-01), Coulon
ABB Management AG
Sheehan John
LandOfFree
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