Abstract
The repair and recovery of both the stationary and the rotating parts of the hot section of a gas turbine are becoming more and more generally accepted practice.
Due to the necessity for repairs on heavily loaded rotating blades and buckets, made out difficult to weld nickelbase superalloys, such as In 738, U 720 and In 939, the need arose for fundamental investigations on repair and recovery procedures with a high turbine operation reliability. The investigation began at Elbar about 5 years ago under different contracts from the Ministry of Economic Affairs, within a European collaboration in the fields of:
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a)
welding of superalloys
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b)
powder metallurgy including hipping of superalloys
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c)
diffusion bonding of superalloys
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d)
repair brazing of superalloys
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e)
development of new diffusion coatings for superalloys, such as 1 step NiCrAlYs, sulfidation resistance coatings such as “Silicon-titanium” and new thermal barrier coatings for superalloys.
As result of this research, new repair techniques have been developed which improve the reliability of repairs extensively. It has been proved that repaired blades are often better than new blades, because of the use of superior materials, better coatings and modified heat treatments.
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E.B. Welding of P.M. Ni-base superalloys R. Thambury, W. Wallace Nat. Aeronatical Establishment Ottawa Paper presented at P.M. superalloy conference in Nomvember 1980 in Zurich, Switzerland.
A new approach to the weldability of nickelbase as cast and powder metallurgy superalloys. M.H. Haafkens/J.H.G. Mattheij, Elbar B.V. Agard 53rd meeting of the structures and material panel conference proc. no. 317 “Maintenance in service of high temperature parts” The Netherlands, October 1981.
M.H. Haafkens/J.H.G. Mattheij, Elbar B.V. “TIG welding and Plasma welding of P.M. and as cast superalloys”, Cost-50 Round III NL2 Report November 1980.
Marijnissen G.H., Elbar B.V. “A titanium Silicon coating for Gas Turbine blades” Agard 53rd meeting of the structures and material Panel. Netherlands October 1981.
Marijnissen G.H./Van Schaik T., Elbar B.V. “Study of gas phase coating mechanisms” Cost-50 Round II NL3 Final Report December 1980.
McCall “Can turbine blade life be extended by reconditioning Combustion” April 1971 p 27–33
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© 1982 ECSC, EEC, EAEC, Brussels and Luxembourg
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Haafkens, M.H. (1982). Blade Repair and Recovery. In: Brunetaud, R., Coutsouradis, D., Gibbons, T.B., Lindblom, Y., Meadowcroft, D.B., Stickler, R. (eds) High Temperature Alloys for Gas Turbines 1982. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7907-9_47
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DOI: https://doi.org/10.1007/978-94-009-7907-9_47
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