Metallurgical Analysis on Leaked XH-43 Superalloy LH2 Exhaust Casing Investment Casting

Ni–Fe-based superalloy XH-43 is extensively used in aerospace applications due to high creep resistance, oxidation resistance and retention of its mechanical properties at higher temperatures. Complex geometrical components like LH2 exhaust casings are made through investment casting process. In the...

Full description

Saved in:
Bibliographic Details
Published inJournal of failure analysis and prevention Vol. 23; no. 3; pp. 1265 - 1274
Main Authors Lagudu, Yerrinaidu, Agarwal, Alok, Manwatkar, Sushant K., Kumar Gupta, Rohit, Bajargan, Govind
Format Journal Article
LanguageEnglish
Published Materials Park Springer Nature B.V 01.06.2023
Subjects
Creep strength
Ferrous alloys
High temperature
Investment casting
Leakage
Mechanical properties
Metallurgical analysis
Nickel base alloys
Optical microscopy
Oxidation resistance
Superalloys
X ray microscopy
Online AccessGet full text

Cover

More Information
Summary:Ni–Fe-based superalloy XH-43 is extensively used in aerospace applications due to high creep resistance, oxidation resistance and retention of its mechanical properties at higher temperatures. Complex geometrical components like LH2 exhaust casings are made through investment casting process. In the present case, leakage was observed in an exhaust casing casting during helium leak check after the high temperature–pressure test. Investigation through detailed X-ray microscopy analysis and optical microscopy revealed interconnected micro-shrinkage porosities opening to the surface at a corner location. The cause of leakage is attributed to the presence of longer through-thickness interconnected shrinkage porosities in the casting.
ISSN:1547-7029
1864-1245
DOI:10.1007/s11668-023-01660-5