Heterogenita Inconelu 713LC a 738LC

Heterogeneity of inconel 713LC and Inconel 738LC

conference paper

en

The contribution deals with the chemical and structural heterogeneity of a creep resistant Ni-based alloy Inconel 713 LC and Inconel 738 LC. These materials belong to the cast poly-crystalline nickel super-alloys which are used for the production of circulating wheels of small combustion turbines for supplementary energetic units in aviation industry. In operational conditions of combustion turbines as part of turbo engines, blades of the circulating wheels are stressed in time, temperature and stress variable cycles during the loading procedure. The blades are exposed to a series of degradation factors such as high-temperature corrosion, fatigue processes and creep during the operation. Measurement of the chemical microheterogeneity of elements was realized in as-cast state before and after exploitation. As microanalytical complex was applied JEOL JXA 8600/KEVEX Delta V Sesame and EDS. In the analysis of chemical microheterogeneity, the concentrations of Al, Ti, Cr, Ni, Zr, Nb, Mo were measured in 101 points of the structure. Then the indices of dentritic microheterogeneity IH were estimated. The redistribution of elements is discussed.

Příspěvek zhodnocuje chemickou a strukturní heterogenitu niklové slitiny Inconel 713 LC a 738LC. Tento materiál patří mezi lité polykrystalické niklové superslitiny, které jsou užívány k výrobě oběžných kol malých spalovacích turbín pro pomocné energetické jednotky v leteckém průmyslu. Měření chemické mikroheterogenity prvků bylo realizováno na vzorcích v litém stavu před a po provozním zatížení. K měření koncentračních dat vybraných prvků byl použit mikroanalytický komplex JEOL JXA 8600/KEVEX Delta V Sesame a metoda EDA (energiové disperzní analýzy). Na každém vzorku byly měřeny koncentrace sedmi prvků (Al,Ti,Cr,Ni,Zr,Nb,Mo) ve 101 bodech struktury. Na základě matematicko-statistických metod byly vypočítány základní segregační charakteristiky měřených prvků.

The contribution deals with the chemical and structural heterogeneity of a creep resistant Ni-based alloy Inconel 713 LC and Inconel 738 LC. These materials belong to the cast poly-crystalline nickel super-alloys which are used for the production of circulating wheels of small combustion turbines for supplementary energetic units in aviation industry. In operational conditions of combustion turbines as part of turbo engines, blades of the circulating wheels are stressed in time, temperature and stress variable cycles during the loading procedure. The blades are exposed to a series of degradation factors such as high-temperature corrosion, fatigue processes and creep during the operation. Measurement of the chemical microheterogeneity of elements was realized in as-cast state before and after exploitation. As microanalytical complex was applied JEOL JXA 8600/KEVEX Delta V Sesame and EDS. In the analysis of chemical microheterogeneity, the concentrations of Al, Ti, Cr, Ni, Zr, Nb, Mo were measured in 101 points of the structure. Then the indices of dentritic microheterogeneity IH were estimated. The redistribution of elements is discussed.

heterogeneity, Inconel, Ni-based

2006

01.09.2006

Faculty of Mechanical Engineering in Zenica, Bosna and Herzegovina

Bosna and Herzegovina, Barcelona, Turkey

9958-617-30-7

TMT 2006 Proceedings

1

249–252

4