View in EDS

On the fatigue crack growth behavior of nanocrystalline CrMnFeCoNi.

Saved in:
Bibliographic Details
Title: On the fatigue crack growth behavior of nanocrystalline CrMnFeCoNi.
Authors: Pillmeier, Simon1 (AUTHOR), Burtscher, Michael1 (AUTHOR), Laplanche, Guillaume2 (AUTHOR), Pippan, Reinhard3 (AUTHOR), Eckert, Jürgen1,3 (AUTHOR), Hohenwarter, Anton1 (AUTHOR) anton.hohenwarter@unileoben.ac.at
Source: International Journal of Fatigue. Nov2024, Vol. 188, pN.PAG-N.PAG. 1p.
Subjects: Crack closure, Fracture mechanics, Material plasticity, Lead alloys, Plastics, Fatigue crack growth
Abstract: • Fatigue crack growth behavior of the nanocrystalline Cantor-alloy was explored. • A reduction of grain size invokes faster crack growth and lower threshold values. • Crack closure effects, i.e. roughness induced closure, become negligible. • A stainless steel investigated for comparison shows almost identical behavior. The fatigue crack growth (FCG) behavior of the equimolar CrMnFeCoNi Cantor-alloy in the nanocrystalline grain size regime has been explored with special focus on the influence of specimen orientation and the effect of additional heat-treatments. For the synthesis severe plastic deformation using high-pressure torsion (HPT) was used. The results were critically discussed regarding the impact of grain size on the FCG-behavior and compared to a conventional 316L stainless steel in the nanocrystalline state: The reduction of grain size in the Cantor alloy from the micrometer to the nanometer regime invokes crack growth rates being about one order of magnitude higher paired with significantly lower threshold values. Furthermore, the sensitivity of thresholds and crack growth rates in the Paris regime on the applied load ratio in the NC material state is also profoundly reduced. This can be explained based on a diminishing contribution of crack closure effects, especially roughness induced closure. Even though the chemical composition differs distinctively, the crack growth rates and fatigue threshold values of the nanocrystalline Cantor alloy and the stainless steel are comparable with the latter being slightly lower for the CrMnFeCoNi alloy. Moreover, the extent of anisotropy is more pronounced than for 316L. Heat-treatment leading in the NC-Cantor alloy to an increasing hardness, has also an effect on the FCG-rate and depends on the specimen orientation. In addition, an unusual self-annealing behavior affecting the FCG behavior of the Cantor alloy was found. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Fatigue is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:• Fatigue crack growth behavior of the nanocrystalline Cantor-alloy was explored. • A reduction of grain size invokes faster crack growth and lower threshold values. • Crack closure effects, i.e. roughness induced closure, become negligible. • A stainless steel investigated for comparison shows almost identical behavior. The fatigue crack growth (FCG) behavior of the equimolar CrMnFeCoNi Cantor-alloy in the nanocrystalline grain size regime has been explored with special focus on the influence of specimen orientation and the effect of additional heat-treatments. For the synthesis severe plastic deformation using high-pressure torsion (HPT) was used. The results were critically discussed regarding the impact of grain size on the FCG-behavior and compared to a conventional 316L stainless steel in the nanocrystalline state: The reduction of grain size in the Cantor alloy from the micrometer to the nanometer regime invokes crack growth rates being about one order of magnitude higher paired with significantly lower threshold values. Furthermore, the sensitivity of thresholds and crack growth rates in the Paris regime on the applied load ratio in the NC material state is also profoundly reduced. This can be explained based on a diminishing contribution of crack closure effects, especially roughness induced closure. Even though the chemical composition differs distinctively, the crack growth rates and fatigue threshold values of the nanocrystalline Cantor alloy and the stainless steel are comparable with the latter being slightly lower for the CrMnFeCoNi alloy. Moreover, the extent of anisotropy is more pronounced than for 316L. Heat-treatment leading in the NC-Cantor alloy to an increasing hardness, has also an effect on the FCG-rate and depends on the specimen orientation. In addition, an unusual self-annealing behavior affecting the FCG behavior of the Cantor alloy was found. [ABSTRACT FROM AUTHOR]
ISSN:01421123
DOI:10.1016/j.ijfatigue.2024.108530