Multiscale mechanical fatigue damage of stainless steel investigated by neutron diffraction and X-ray microdiffraction
Abstract
Mechanical fatigue behavior of AL6XN stainless steel as a typical type of planar slip alloy was investigated by in situ neutron diffraction and synchrotron-based X-ray microdiffraction methods. Under cyclic loading at a high strain amplitude (+/- 0.8%), the fatigue damage originated mainly from the accumulation of statistical stored dislocations, as clearly evidenced from a continuous increase in diffraction peak width with increasing the number of load cycles. However, under cyclic loading at a low strain amplitude (+/- 0.3%), the density of statistical stored dislocations became saturated just after a hundred loading cycles and the fatigue damage was mainly dominated by the accumulation of persistent [Alders bands (PLBs) and the complex interactions among various PLBs as evidenced through X-ray microdiffraction measurements. It was further found that there exists obvious grain-orientation-dependent local damage in the low-strain-amplitude fatigued sample. In particular, fatigued grains orientated with [001] paralleling the loading direction are subjected to compressive stress and contain a large number of broad PLBs in boundaries arraying the edge dislocation pile-ups, which generate a large stress gradient leading to local plastic instability. As a result, the highly localized stress field at PLBs in the cyclically-deformed sample at a low strain amplitude may explain themore »
- Authors:
-
- Univ. of Science and Technology Beijing, Beijing (China); Northern Illinois Univ., DeKalb, IL (United States)
- Univ. of Science and Technology Beijing, Beijing (China); Northeastern Univ., Shenyang (China)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Northeastern Univ., Shenyang (China)
- Univ. of Science and Technology Beijing, Beijing (China)
- Northern Illinois Univ., DeKalb, IL (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1507001
- Alternate Identifier(s):
- OSTI ID: 1636994
- Grant/Contract Number:
- AC05-00OR2272; AC02-06CH11357; 2017YFA0403804; 51471032; 51527801; 06111020; 2018Z-13; AC05-00OR22725
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 165; Journal Issue: C; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; fatigue behavior; neutron diffraction; shear band; stainless steel; synchrotron X-ray diffraction
Citation Formats
Li, Runguang, Wang, Yan -Dong, Liu, Wenjun, Geng, Chang, Xie, Qingge, Brown, Dennis E., and An, Ke. Multiscale mechanical fatigue damage of stainless steel investigated by neutron diffraction and X-ray microdiffraction. United States: N. p., 2018.
Web. doi:10.1016/j.actamat.2018.11.055.
Li, Runguang, Wang, Yan -Dong, Liu, Wenjun, Geng, Chang, Xie, Qingge, Brown, Dennis E., & An, Ke. Multiscale mechanical fatigue damage of stainless steel investigated by neutron diffraction and X-ray microdiffraction. United States. https://doi.org/10.1016/j.actamat.2018.11.055
Li, Runguang, Wang, Yan -Dong, Liu, Wenjun, Geng, Chang, Xie, Qingge, Brown, Dennis E., and An, Ke. 2018.
"Multiscale mechanical fatigue damage of stainless steel investigated by neutron diffraction and X-ray microdiffraction". United States. https://doi.org/10.1016/j.actamat.2018.11.055. https://www.osti.gov/servlets/purl/1507001.
@article{osti_1507001,
title = {Multiscale mechanical fatigue damage of stainless steel investigated by neutron diffraction and X-ray microdiffraction},
author = {Li, Runguang and Wang, Yan -Dong and Liu, Wenjun and Geng, Chang and Xie, Qingge and Brown, Dennis E. and An, Ke},
abstractNote = {Mechanical fatigue behavior of AL6XN stainless steel as a typical type of planar slip alloy was investigated by in situ neutron diffraction and synchrotron-based X-ray microdiffraction methods. Under cyclic loading at a high strain amplitude (+/- 0.8%), the fatigue damage originated mainly from the accumulation of statistical stored dislocations, as clearly evidenced from a continuous increase in diffraction peak width with increasing the number of load cycles. However, under cyclic loading at a low strain amplitude (+/- 0.3%), the density of statistical stored dislocations became saturated just after a hundred loading cycles and the fatigue damage was mainly dominated by the accumulation of persistent [Alders bands (PLBs) and the complex interactions among various PLBs as evidenced through X-ray microdiffraction measurements. It was further found that there exists obvious grain-orientation-dependent local damage in the low-strain-amplitude fatigued sample. In particular, fatigued grains orientated with [001] paralleling the loading direction are subjected to compressive stress and contain a large number of broad PLBs in boundaries arraying the edge dislocation pile-ups, which generate a large stress gradient leading to local plastic instability. As a result, the highly localized stress field at PLBs in the cyclically-deformed sample at a low strain amplitude may explain the obvious cyclic stress softening.},
doi = {10.1016/j.actamat.2018.11.055},
url = {https://www.osti.gov/biblio/1507001},
journal = {Acta Materialia},
issn = {1359-6454},
number = C,
volume = 165,
place = {United States},
year = {Sat Dec 01 00:00:00 EST 2018},
month = {Sat Dec 01 00:00:00 EST 2018}
}
Web of Science