Dynamic Behaviors and Microstructure Evolution of Iron–Nickel Based Ultra-High Strength Steel by SHPB Testing

Iron–nickel based ultra-high strength steel (wt. 18~20% Ni) is characterized by its high strength and low thermal conductivity, and is normally used to make key components by forming and machining processes. The optimization of these processes is based on a deep understanding of the mechanical and d...

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Bibliographic Details
Published in:Metals (Basel ) 2020-01, Vol.10 (1), p.62
Main Authors: Fu, Hongge, Wang, Xibin, Xie, Lijing, Hu, Xin, Umer, Usama, Rehman, Ateekh Ur, Abidi, Mustufa Haider, Ragab, Adham E.
Format: Article
Language:English
Subjects:
Compression tests
Crack propagation
Deformation
dynamic behavior
Dynamic recrystallization
Heat conductivity
High strain rate
High strength steel
High strength steels
High temperature
iron–nickel based ultra-high strength steel
Machining
Mechanical properties
Microstructure
Nickel
Optimization
Sample size
shpb
Strain hardening
Thermal conductivity
Yield stress
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Summary:Iron–nickel based ultra-high strength steel (wt. 18~20% Ni) is characterized by its high strength and low thermal conductivity, and is normally used to make key components by forming and machining processes. The optimization of these processes is based on a deep understanding of the mechanical and dynamic behaviors under high strain, high strain rate, and high temperature. In this paper, the relationship of stress to strain, strain rate, and temperature is systematically investigated by the dynamic compression tests combined with quasi-static compression tests, and the hardening and softening is associated with the transformation in microstructures. According to the analysis, dynamic recrystallization around 600 °C is assumed to be one important influencing factor, hence hot deformation equations are established and the critical strain for dynamic recrystallization and the volume fraction of the dynamic recrystallized grains are defined.
ISSN:2075-4701
2075-4701
DOI:10.3390/met10010062