Evaluation of Liquation Cracking Susceptibility of CM247LC Superalloy Repair Welds via Pre-Weld Varestraint Test

In this study, the liquation cracking susceptibility in heat-affected zone of CM247LC superalloy gas turbine blades during repair welding was quantitatively evaluated using a newly developed pre-weld Varestraint test method. The geometry replicated through tests for bead. susceptibility, that is, temperature range (LCTR), could be visualization at time crack formation test. LCTR alloy welds (heat-affected second layer weld) 280 K. Compared to as-cast (620 K) and aged (65 CM247LC, metallurgical mechanisms controlling were examined based on microstructural characterization Scheil’s solidification calculations pre-weld. weld influenced by MC carbide fraction segregated concentration trace impurity elements, such as B S path. A process design capable reducing carbides segregation elements is required. Based experimental theoretical results, proposed modified testing method dissimilar expected analyze behavior effectively manufacturing high-soundness welds.