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In this study, in order to investigate the absorbed energy distribution on the low-temperature impact fracture process of ductile Ni-resist alloyed iron, the low-temperature impact tests of ductile Ni-resist austenitic alloyed iron (the main composition of 23.0 wt.% Ni and 4.0 wt.% Mn) were completed from room temperature to −193°C. Through the analysis of specific energy and load, the result shows that the impact crack initial energy Ei and unstable propagation energy Eup of ductile Ni-resist alloyed iron respectively present opposite trend with the decreasing of temperature, but their total energy Eadd is relatively stable. The metastable propagation strength energy Est under high load in the impact fracture process is the main decisive factor on the low-temperature impact property of ductile Ni-resist alloyed iron, and it is determined by the increasing of average energy valley load Fave and the decreasing of metastable propagation deflection dst under high load respectively at the front and back of the extreme point (−80°C).

Absorbed Energy Distribution of Ductile Ni-resist Alloyed Iron Under Instrumented Impact Load at Low Temperatures