High-Temperature Nickel-Base Alloys for Marine and Stationary Gas Turbine Engines

HIGH-TEMPERATURE   NICKEL- BASE   ALLOYS   FOR   MARINE   AND   STATIONARY GAS TURBINE ENGINES

Yevgeny E.L. Sanchugov, University Hanover, FUN, section Institute of Mechanic Dynamic, Hanover, Germany

Anatoly A. D. Koval, National technical University, Zaporozhye, Ukraine

Sergey S.B. Belikov, National technical University, Zaporozhye, Ukraine

Problems of alloying of high-temperature nickel alloys resistant to hot (salt)  corrosion are considered. The hot (salt) corrosion resistance of the alloys in the combustion products of fuel bearing 1% S with an additionally sprayed aqueous solution of sodium salts was evaluated on stands for isothermal and thermocycling tests with creation of a high-temperature medium. In addition, the resistance of some test alloys to hot (salt) corrosion was determined by the method of semisubmersion into crucibles with molten salts (75% Na₂SO₄ + 25% NaCl).  The relationship between the structure and properties of alloys and the alloying set that provides high service characteristics is studied. The performed study allowed used to create a class of high-temperature corrosion-resistant nickel alloys (ZMI-2, ChS70VI, ZMI-3, SNL-1, ChS91VI, ZMI-11, etc.) that posses a moderate or high (VKh4LM) chromium content (30%), a Ti /Al ratio exceeding unity, and a balanced content of refractory and rare earth elements. The obtained dependences are used to create new nickel superalloys:

-         ChS70-VI, ChS91-VI, ChS104-VI, VKh4-LM (with 30%Cr) – for marine and gas-pumping units;

-         ZMI-3, ZMI-11 – for gas-pumping units (for example, at compressor stations of Pipeline Russia-EU).

Keywords: high-temperature alloys, nickel, hot (salt) corrosion, alloying, properties, gas-turbine