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Title: 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 » obvious cyclic stress softening.« less

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6]; ORCiD logo [7]
  1. Univ. of Science and Technology Beijing, Beijing (China); Northern Illinois Univ., DeKalb, IL (United States)
  2. Univ. of Science and Technology Beijing, Beijing (China); Northeastern Univ., Shenyang (China)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Northeastern Univ., Shenyang (China)
  5. Univ. of Science and Technology Beijing, Beijing (China)
  6. Northern Illinois Univ., DeKalb, IL (United States)
  7. 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. Sat . "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 = {2018},
month = {12}
}

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