Ductile-brittle transition behavior of nodular cast iron under low temperature and impact loading

ZHANG Yongxin; FAN Changzeng; XU Zejian; QI Kaili; ZHOU Zhou

doi:10.11883/bzycj-2024-0002

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ZHANG Yongxin, FAN Changzeng, XU Zejian, QI Kaili, ZHOU Zhou. Ductile-brittle transition behavior of nodular cast iron under low temperature and impact loading[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0002

Citation:

ZHANG Yongxin, FAN Changzeng, XU Zejian, QI Kaili, ZHOU Zhou. Ductile-brittle transition behavior of nodular cast iron under low temperature and impact loading[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0002

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Ductile-brittle transition behavior of nodular cast iron under low temperature and impact loading

doi: 10.11883/bzycj-2024-0002

1.
Yanqi Lake (Beijing) Institute of Basic Manufacturing Technology Research Co., Ltd, Beijing 101400, China
2.
Beijing Institute of Technology University, State Key Laboratory of Explosion Science and Safety Protection, Beijing 100081, China

Received Date: 2023-10-09
Rev Recd Date: 2024-03-21

Available Online: 2024-03-26

Abstract

Abstract

To understand the dynamic fracture characteristics of nodular cast iron structures, such as the spent nuclear fuel storage and transportation vessel, under low temperature and dynamic loads, the mode Ⅰ dynamic fracture toughness (DFT) of nodular cast iron was experimentally investigated at different temperatures (20℃, −40℃, −60℃ and −80℃) using an improved split Hopkinson pressure bar technique. The ductile-brittle transition behavior of the material was specially investigated. The standard three-point bending specimens with fatigue crack were pre-fabricated before the experiment. A special fixture was used to replace the transmitter bar during the experiment, while the temperature was controlled by a specially designed environmental chamber. The crack initiation time of the specimens was determined by the strain gage method. The experimental-numerical method was used to determine the dynamic stress intensity factor (DSIF) at the crack tip. Mesh refinement and element transition was used at the crack tip region to ensure a high-accuracy result of displacement field. On this basis, the mode Ⅰ DFT of the material was finally determined. The results show that under the same impact velocity, the DFT and fracture initiation time of nodular cast iron decrease significantly with the decrease in temperature. The macroscopic fracture surface of nodular cast iron changes from rough to relatively flat with the decrease of temperature, which indicates the change in the failure modes of the material. The effect of temperature on the failure mode is further verified by the quantitative microscopic analysis of the fracture. As the temperature decreases, the number of dimples on the fracture surface decreases, while the river patterns as well as cleavage steps increase. It means that the ductility of the material is weakened but the brittleness is enhanced at low temperatures. This ductile-brittle transition phenomenon is consistent with the tendency of the measured toughness of the material.
- nodular cast iron,
- temperature effect,
- mode I dynamic fracture toughness,
- ductile-brittle transition

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References(22)

References

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