738LC is a precipitation hardenable Ni-based super alloy frequently used for gas turbine blades in hot section of the turbine. The alloy exhibits superior tensile and creep properties at high temperature. The design complexity of blade design had encouraged technical community to exploit the benefits of 3D printing and improve the efficiency of the blades vis-à-vis the turbine. Due to metallurgical complexity associated with the strengthening phenomenon of 738LC, it has proven to be a difficult alloy for additive manufacturing. In this study effort has been made to understand the powder characteristics and printability of 738LC alloy powder by parameter optimization and chemistry modification. Micro cracking was quantified in order to assess the effect of chemistry modification. Candidates were identified for further testing and evaluation. Accordingly, relevant mechanical properties were generated and microstructure analyzed. Room temperature tensile properties were seen better than cast properties, however change in morphology of gamma prime phase were also observed in the modified versions.
- Appreciate the challenges faced by AM community
- Ways to improve printability for difficult alloy system
- Appreciate the importance of powder characteristics in the field of AM