期刊
出版社
ASME
DOI: 10.1115/1.4051087
关键词
constitutive relations; mechanical behavior
资金
- Grant of Excellence Departments, MIUR-Italy [COMMI 314-337 LEGGE 232/2016]
This study investigated the compression behavior of Inconel 625 fabricated by LMD, proposing a modified mechanical model to describe its specific mechanical properties, and used multiple models to represent the effects of strain rate and temperature on material properties.
Laser metal deposition (LMD) is an additive manufacturing process with an extreme potential in large-scale metal production. Among the printable metals, the Inconel 625 has found a wide variety of cutting-edge applications in the aerospace, defense, and space sectors. Thus, knowledge of mechanical properties under quasi-static and dynamic conditions is fundamental. In this work, the quasi-static and dynamic compression behavior of Inconel 625 obtained by LMD is presented. The curves of printed Inconel 625 showed a change in slope in the work hardening phase, which is due to the mechanics of the dislocation motion. Therefore, a modified two-stage (TS) Hollomon power-law is proposed to model this specific mechanical behavior, which identifies a threshold strain that delimit two different hardening behaviors. Furthermore, Johnson-Cook and Cowper-Symonds models were used to represent the effect of strain rate and temperature on the material properties. A variable strain rate sensitivity along the compression strain was found. Hence, double sensitivity terms were introduced into the TS Hollomon power-law, allowing to reproduce the dynamic behavior of Inconel 625.
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