Study on Creep Properties and Deformation Mechanisms of Novel Nickel‐Based Deposited Metal

The creep behaviors and deformation mechanism of nitrogen‐containing nickel‐based welding materials deposited metal in a wide temperature range (600–900 °C) and stress range (50–500 MPa) have been studied. At 600 °C, the microstructure of the creep sample includes γ matrix, M(C, N), γ′ phase, Laves phase, and M 23 C 6 . Continuous stacking faults can be observed, resulting in mixed type fracture; At 700 and 800 °C/200 MPa, M 23 C 6 phase dissolves back into the matrix. The dislocation loops can be seen. Resulting in mixed mode fracture dominated by transgranular fracture; At 900 and 800 °C/80 MPa, the M(C, N) and γ′ phases exhibit excellent high‐temperature stability. The large number of dislocation networks appearing, resulting in mixed mode fracture dominated by intergranular fracture.