HOT CRACKING OF NICKEL-BASED SUPERALLOY TURBINE BLADE | Zendy

Łukasz Rakoczy | Zendy; Lechosław Tuz | Zendy; Krzysztof Pańcikiewicz | Zendy

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HOT CRACKING OF NICKEL-BASED SUPERALLOY TURBINE BLADE

Author(s) -

Łukasz Rakoczy,

Lechosław Tuz,

Krzysztof Pańcikiewicz

Publication year - 2015

Publication title -

metallurgy and foundry engineering

Language(s) - English

Resource type - Journals

eISSN - 2300-8377

pISSN - 1230-2325

DOI - 10.7494/mafe.2015.41.4.181

Subject(s) - liquation , superalloy , materials science , scanning electron microscope , metallurgy , cracking , welding , turbine blade , alloy , heat affected zone , optical microscope , tungsten , turbine , composite material , mechanical engineering , engineering

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.

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