51312-01429-SOME PECULIARITIES OF ALLOYING OF NICKEL SUPERALLOYS RESISTANT TO HIGH-TEMPERATURE CORROSION FOR HOT

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Product Number: 51312-01429-SG

ISBN: 01429 2012 CP

Author: Yevgeny E.L. Sanchugov

Publication Date: 2012

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Yevgeny E.L. Sanchugov1Anatoly A. D. Koval2Sergey S.B. Belikov31 Dr. University Hanover FUN section Institute of Mechanik Dynamic Hanover Germany 2 Prof. Dr. National technical University Zaporozhye Ukraine 3 Prof. Dr. National technical University Zaporozhye Ukraine SOME PECULIARITIES OF ALLOYING OF NICKEL SUPERALLOYS RESISTANT TO HIGH-TEMPERATURE CORROSION FOR HOT PART ELEMENTS OF GAS TURBINE ENGINES The present work is devoted to the relationship between the alloying structure and properties of nickel alloys resistant to high-temperature corrosion (HTC) in products of fuel combustion which is used for example for hot part elements of gas turbine engines (GTE) at compressor stations (Pipeline Russia-EU). The HTC 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 HTC was determined by the method of semisubmersion into crucibles with molten salts (75% Na2SO4 + 25% NaCl). We studied the effect of chromium on the processes of HTC and high-temperature mechanical properties for nickelsuperalloys. We studied the influence of the titanium-to-aluminum proportion on the structure and properties of Ni – 15% Cr – 8% (Al + Ti) (Ti / Al = n = 03 – 40) superalloys. It turned out that high-temperature nickel alloys with moderate chromium content (13…16%) optimum titanium aluminum contents at Ti / Al = 1…2 can have a satisfactory HTC resistance and high high-temperature mechanical properties. 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. Keywords: high-temperature alloys nickel high-temperature corrosion alloying properties gas turbine