Effects of boron addition on the microstructure and creep properties of a Ni-Fe-based superalloy weld metal alloy

Abstract

The role of boron in the creep properties and grain boundary characteristics in a new Ni-Fe-based weld metal suitable for advanced ultra-supercritical (A-USC) coal-fired power plant applications has been investigated. Ni-Fe-based filler wires without boron and boron-doped (50 ppm wt% boron) were prepared for this study. Boron-doped weld metals exhibited longer rupture lives and lower steady creep rates during the creep rupture tests at 750℃ / 380 MPa and 750℃ / 210 MPa. This study explains the improvement mechanism of boron on creep resistance from the perspective of the ef-fect of boron on M23C6. Boron increased the nucleation rate of M23C6 and participated in the formation of M23(C, B)6 type boron-carbides. After creep deformation, boron still existed stably in the M23(C, B)6. The higher density of discrete M23C6 particles due to boron addition could restrain grain boundary crack propagation and grain boundary sliding, and thereby improve the creep fracture resistance of the GH984G weld metal at 750℃ / (380/ 210 MPa).

Microstructural Characterization of IN617 and DMV617 Mod Alloys after Long-Time Aging at 700 °C

“…Proc. 2024, 64, 12 5 of 6 of the "mesh" M 23 C 6 particles on grain boundaries can be removed by the release of the γ phase at the grain boundaries, blocking the growth of M 23 C 6 [5]. Inside the grains, small carbides with a plate-like and rod-like shape are observed after long-term aging (Figure 5).…”

“…the γ′ phase at the grain boundaries, blocking the growth of M23C6 [5]. Inside the grains, small carbides with a plate-like and rod-like shape are observed after long-term aging (Figure 5).…”

“…The new DMV617 mod alloys contain additional B and N in their chemical compositions. These additives cause a more favorable set of functional properties [4,5]. In the present paper, the changes in the structure of IN617 and DMV617 mod alloys after aging at a temperature of 700 • C and a heating time of 5 h and 1000 h are investigated [6].…”