High Cycle Fatigue Data Transferability of MAR-M 247 Superalloy from Separately Cast Specimens to Real Gas Turbine Blade

0534779 - ÚFM 2021 RIV CH eng J - Journal Article
Šmíd, Miroslav - Horník, Vít - Kunz, Ludvík - Hrbáček, Karel - Hutař, Pavel
High Cycle Fatigue Data Transferability of MAR-M 247 Superalloy from Separately Cast Specimens to Real Gas Turbine Blade.
Metals. Roč. 10, č. 11 (2020), č. článku 1460. E-ISSN 2075-4701
R&D Projects: GA MŠMT(CZ) LQ1601; GA MŠMT LM2015069; GA MPO(CZ) EG15_019/0004399
Research Infrastructure: IPMINFRA - 90069
Institutional support: RVO:68081723
Keywords : high-temperature fatigue * nickel-based superalloy * investment casting * metallography * turbine blade
OECD category: Mechanical engineering
Impact factor: 2.351, year: 2020
Method of publishing: Open access
https://www.mdpi.com/2075-4701/10/11/1460

Cast polycrystalline superalloys are widely used for critical components in aerospace and
automotive industries, such as turbine blades or turbocharges. Therefore, their fatigue endurance
belongs to one of the most essential mechanical characteristics. Full-scale testing of such components
involves great technical difficulties and requires significant experimental effort. The present study
evaluates the effects of microstructural parameters with respect to representative fatigue testing of a
cast turbine blade by separately cast specimens. For that purpose, the cast polycrystalline MAR-M 247
Ni-based superalloy was investigated in the following conditions: (i) specimens extracted from a real
gas turbine blade, specimens separately cast into the mould with (ii) top or (iii) bottom filling systems.
Obtained diverse microstructures allowed us to assess the effect of grain size, porosity, and texture on
fatigue performance. The tests were held at a symmetrical loading regime at temperature 800 °C
in laboratory air. The results indicate that the level of porosity is a dominant structural parameter
determining the fatigue endurance, while grain size and texture effects were of minor importance
contributing mainly to fatigue life scatter.
Permanent Link: http://hdl.handle.net/11104/0312982