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Title: A brittle fracture mechanism in thermally aged duplex stainless steels revealed by in situ high-energy X-ray diffraction

Abstract

A direct relationship between the microstructural evolution and macroscopic fracture behaviors of a thermally aged (at 475 °C for 400 h) duplex stainless steel (DSS) has been established with experimental results from atom probe tomography (APT), nanoindentation and in situ synchrotron-based high-energy X-ray diffraction (HE-XRD). Furthermore, the APT experiments demonstrate that ferrite in DSS spinodally decomposes into Cr-enriched and Cr-depleted domains during thermal aging, which leads to a severe hardening effect in ferrite. The lattice strain development during deformation acquired with the in situ HE-XRD measurements confirms the cleavage fracture of α{110} and α{200} ferrite grains aligned perpendicular to loading direction. The thermally aged DSS can be readily fractured by connecting the cleavage cracks in ferrite. Conclusively, the spinodal-decomposition-induced hardening in ferrite and the premature failure of ferrite control the final brittle fracture in the aged DSS.

Authors:
 [1];  [2];  [2];  [2]; ORCiD logo [2]; ORCiD logo [2];  [3];  [2]
  1. Univ. of Science and Technology Beijing, Beijing (China); Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Univ. of Science and Technology Beijing, Beijing (China)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Lemont, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1503592
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 739; Journal Issue: C; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; Duplex stainless steels; High-energy X-ray diffraction; spinodal decomposition; thermal aging

Citation Formats

Li, Shilei, Wang, Tiancheng, Tan, Qing, Li, Runguang, Wang, Yanli, Wang, Xitao, Ren, Yang, and Wang, Yandong. A brittle fracture mechanism in thermally aged duplex stainless steels revealed by in situ high-energy X-ray diffraction. United States: N. p., 2018. Web. doi:10.1016/j.msea.2018.10.025.
Li, Shilei, Wang, Tiancheng, Tan, Qing, Li, Runguang, Wang, Yanli, Wang, Xitao, Ren, Yang, & Wang, Yandong. A brittle fracture mechanism in thermally aged duplex stainless steels revealed by in situ high-energy X-ray diffraction. United States. doi:10.1016/j.msea.2018.10.025.
Li, Shilei, Wang, Tiancheng, Tan, Qing, Li, Runguang, Wang, Yanli, Wang, Xitao, Ren, Yang, and Wang, Yandong. Fri . "A brittle fracture mechanism in thermally aged duplex stainless steels revealed by in situ high-energy X-ray diffraction". United States. doi:10.1016/j.msea.2018.10.025.
@article{osti_1503592,
title = {A brittle fracture mechanism in thermally aged duplex stainless steels revealed by in situ high-energy X-ray diffraction},
author = {Li, Shilei and Wang, Tiancheng and Tan, Qing and Li, Runguang and Wang, Yanli and Wang, Xitao and Ren, Yang and Wang, Yandong},
abstractNote = {A direct relationship between the microstructural evolution and macroscopic fracture behaviors of a thermally aged (at 475 °C for 400 h) duplex stainless steel (DSS) has been established with experimental results from atom probe tomography (APT), nanoindentation and in situ synchrotron-based high-energy X-ray diffraction (HE-XRD). Furthermore, the APT experiments demonstrate that ferrite in DSS spinodally decomposes into Cr-enriched and Cr-depleted domains during thermal aging, which leads to a severe hardening effect in ferrite. The lattice strain development during deformation acquired with the in situ HE-XRD measurements confirms the cleavage fracture of α{110} and α{200} ferrite grains aligned perpendicular to loading direction. The thermally aged DSS can be readily fractured by connecting the cleavage cracks in ferrite. Conclusively, the spinodal-decomposition-induced hardening in ferrite and the premature failure of ferrite control the final brittle fracture in the aged DSS.},
doi = {10.1016/j.msea.2018.10.025},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
issn = {0921-5093},
number = C,
volume = 739,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on October 12, 2019
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