Effect of Mechanical Properties Using Different Filler Metals on Wide-Clearance Activated-Diffusion- Brazed Ni-Based Superalloy

摘要: The investigation of mechanical properties and failure mechanism activated-diffusion-brazed (ADB) joints in IN-738 plate were conducted. Joints this type, which had wide clearance, formed using the brazing alloys Nicrobraz 150 DF4B. microstructural characterization showed that chromium borides with a blocky morphology present associated two alloys. A major difference matrix phase chemistry was observed, however, for alloys, e.g., an Ni-B eutectic observed 150, but DF4B exhibited coarsened gamma prime (γ) absence nickel boride phase. Results tensile test ADB specimens alloy 95% nominal strength base materials. Fracture cracks joint area initiated confined to dispersed sites. However, poor at all testing temperatures, their fractures brittle site propagated along weak-bonded interface between