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Investigations into the influence of the tup velocity and the heat treatment on the Dynamic Fracture Toughness of inconel 625
Author(s) -
Krompholz K.,
Tipping P.,
Ullrich G.
Publication year - 1984
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19840150603
Subject(s) - materials science , fracture toughness , inconel , toughness , fracture mechanics , composite material , dynamic load testing , fracture (geology) , metallurgy , mechanics , structural engineering , alloy , engineering , physics
Experiments were performed with an instrumented impact machine using different drop heights, on the nickel base alloy Inconel 625 in the as‐received state and after heat treatment for about 3.6 Ms (1000 h) at 923 K (650°C). The absorbed impact energy can be obtained either by the direct dial reading, by the integration of the load versus load point displacement diagram or by the integration of the load versus time diagram, knowing the initial impact velocity v 0 of the tup. In all cases the agreement was excellent. It is shown that. the dynamic fracture toughness is dependent on the tup velocity v 0 and, as a consequence, on the total energy of the hammer at the different drop heights. defining a dynamic stress σ from the velocity dependence of the fracture toughness, the stress σ is higher for the embrittled material – a tendency verified by tensile tests. the dynamic fracture toughness can be correlated with the absorbed impact energy up to the load maximum for the heat treated material while the as‐received material exhibits no such dependence.The change in the tup velocity during the impact process is only small for this type of material.