Abstract
Cast duplex stainless steels (CDSS) were investigated in order to understand the mechanical properties of their individual constituents, ferrite and austenite, after thermal aging at 475 °C for up to 2000 h, using nanoindentation and micropillar compression. Nanoindentation experiments indicate that the hardness of ferrite continuously increases with increasing aging time, while after annealing heat treatment the hardness drops to slightly higher than that of the as-received condition. The hardness in austenite did not change significantly with different aging conditions. The results of micropillar compression on both ferrite and austenite, with [1 1 1] orientation, reveal similar trends to the results from nanoindentation. After the long-term thermal aging process, spinodal decomposition takes place, as well as G-phase precipitates forming in the ferrite phase. Then, after annealing, the spinodal decomposition products were reduced and only the G-phases were left in the ferrite phase. Hardening in ferrite is mostly caused by the spinodal decomposition but also related to G-phase precipitates. The role of the G-phase can be explained via precipitation hardening theory, i.e., the small G-phases block the movement of dislocations throughout the ferrite lattice.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 520-528 |
| Number of pages | 9 |
| Journal | Materials Science and Engineering A |
| Volume | 743 |
| DOIs | |
| State | Published - Jan 16 2019 |
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Keywords
- Cast duplex stainless steel
- Micropillar compression
- Nanoindentation
- Thermal aging
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
Cite this
Mechanical properties of a thermally-aged cast duplex stainless steel by nanoindentation and micropillar compression. / Zhang, Qingdong; Singaravelu, Arun Sundar S.; Zhao, Yongfeng; Jing, Tao; Chawla, Nikhilesh.
In: Materials Science and Engineering A, Vol. 743, 16.01.2019, p. 520-528.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Mechanical properties of a thermally-aged cast duplex stainless steel by nanoindentation and micropillar compression
AU - Zhang, Qingdong
AU - Singaravelu, Arun Sundar S.
AU - Zhao, Yongfeng
AU - Jing, Tao
AU - Chawla, Nikhilesh
PY - 2019/1/16
Y1 - 2019/1/16
N2 - Cast duplex stainless steels (CDSS) were investigated in order to understand the mechanical properties of their individual constituents, ferrite and austenite, after thermal aging at 475 °C for up to 2000 h, using nanoindentation and micropillar compression. Nanoindentation experiments indicate that the hardness of ferrite continuously increases with increasing aging time, while after annealing heat treatment the hardness drops to slightly higher than that of the as-received condition. The hardness in austenite did not change significantly with different aging conditions. The results of micropillar compression on both ferrite and austenite, with [1 1 1] orientation, reveal similar trends to the results from nanoindentation. After the long-term thermal aging process, spinodal decomposition takes place, as well as G-phase precipitates forming in the ferrite phase. Then, after annealing, the spinodal decomposition products were reduced and only the G-phases were left in the ferrite phase. Hardening in ferrite is mostly caused by the spinodal decomposition but also related to G-phase precipitates. The role of the G-phase can be explained via precipitation hardening theory, i.e., the small G-phases block the movement of dislocations throughout the ferrite lattice.
AB - Cast duplex stainless steels (CDSS) were investigated in order to understand the mechanical properties of their individual constituents, ferrite and austenite, after thermal aging at 475 °C for up to 2000 h, using nanoindentation and micropillar compression. Nanoindentation experiments indicate that the hardness of ferrite continuously increases with increasing aging time, while after annealing heat treatment the hardness drops to slightly higher than that of the as-received condition. The hardness in austenite did not change significantly with different aging conditions. The results of micropillar compression on both ferrite and austenite, with [1 1 1] orientation, reveal similar trends to the results from nanoindentation. After the long-term thermal aging process, spinodal decomposition takes place, as well as G-phase precipitates forming in the ferrite phase. Then, after annealing, the spinodal decomposition products were reduced and only the G-phases were left in the ferrite phase. Hardening in ferrite is mostly caused by the spinodal decomposition but also related to G-phase precipitates. The role of the G-phase can be explained via precipitation hardening theory, i.e., the small G-phases block the movement of dislocations throughout the ferrite lattice.
KW - Cast duplex stainless steel
KW - Micropillar compression
KW - Nanoindentation
KW - Thermal aging
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UR - http://www.scopus.com/inward/citedby.url?scp=85057329400&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2018.11.112
DO - 10.1016/j.msea.2018.11.112
M3 - Article
VL - 743
SP - 520
EP - 528
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -