HOT CRACKING OF NICKEL-BASED SUPERALLOY TURBINE BLADE
DOI:
https://doi.org/10.7494/mafe.2015.41.4.181Keywords:
superalloys, nickel alloys, liquation, hot cracking, turbine bladesAbstract
The aim of this study was to present the hot cracking behavior of a blade originating from a turbine blade segment. The crack was induced by a gas tungsten arc welding process, and the research material was a MAR-M247 nickel based superalloy. This alloy is considered to be difficult to weld because of its high tendency to crack. Light microscopy and scanning electron microscopy show the occurrence of cracking in the melted zone, heat-affected zone, and base alloy. A scanning electron microscopy investigation revealed that cracks are propagated by stresses and liquation of the low temperature constituent.Downloads
References
Roskosz S.: Kompleksowa ocena porowatości odlewów precyzyjnych z żarowytrzymałych nadstopów niklu. Wydawnictwo Politechniki Śląskiej, Gliwice 2011
Azevedo e Silva P.R.S., Baldan R., Nunes C.A., Coelho G.C., da Silva Costa A.M.: Solution heat-treatment of Nb-modified Mar-M247 superalloy. Materials Characterization, 75 (2013), 214–219
Baldan R., Rocha R., Tomasiello R.: Solutioning and aging of MAR-M247 nickel-based superalloy. Journal of Materials Engineering and Performance, 22, 9 (2013), 2574–2579
Li Z., Gobbi Q S.L., Richter K.H.: Autogenous welding of Hastelloy X to Mar-M 247 by laser. Journal of Materials Processing Technology, 70 (1997), 285–292
Szczotok A., Rodak K.: Microstructural studies of carbides in MAR-M247 nickel-based superalloy. Materials Science and Engineering, 35 (2012), 1–11
Kou S.: Solidification and liquation cracking issues in welding. The Journal of The Minerals, Metals & Materials Society, 55 (2003), 37–42
Klimpel A., Kik T., Mazur Ł.: Żarowytrzymałe stopy niklu – skład chemiczny i struktura. Biuletyn Instytutu Spawalnictwa, 4 (2009), 66–72
Klimpel A., Rzeźnikiewicz A.: Technologia naprawy uchwytów klapy dużej biernej silnika odrzutowego RD-33. Przegląd Spawalnictwa, 9 (2011), 43–49
