Data-driven reduced-order models for rank-ordering the high cycle fatigue performance of polycrystalline microstructures

The bimodal, equiaxed and Widmanstatten microstructures of TC4 titanium alloy were obtained through different heat treatment processes. The content of primary α phase in the bimodal and equiaxed microstructures was measured to be about 40% and 90%, and the average size was about 9.4μm and 7.9 μm. Three types of microstructure fatigue S-N curves are obtained, which are successively descending type, single-platform descending type and infinite life type. The order of very high cycle fatigue performance is Widmanstatten>equiaxed>bimodal, but the anti-fretting fatigue performance of Widmanstatten is the worst. The grain refinement makes the fatigue performance of the equiaxed better than that of the bimodal. The second process is determined as the best heat treatment method. There is no significant difference in the life of the crack propagation stage. The very high cycle fatigue life mainly depends on the crack initiation stage. In the bimodal and the equiaxed, the crack initiates in the primary α phase of the subsurface, and the crack in the Widmanstatten initiates in the coarse α 'grain boundary of the subsurface.

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Data-driven temperature estimation of non-contact solids using deep-learning reduced-order models

International Journal of Heat and Mass Transfer ◽

10.1016/j.ijheatmasstransfer.2021.122383 ◽

2022 ◽

Vol 185 ◽

pp. 122383

Author(s):

Genghui Jiang ◽

Ming Kang ◽

Zhenwei Cai ◽

Yingzheng Liu ◽

Weizhe Wang

Keyword(s):

Deep Learning ◽

Data Driven ◽

Reduced Order Models ◽

Temperature Estimation ◽

Reduced Order

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Influence of grain size and precipitation hardening on high cycle fatigue performance of CuNiSi alloys

Materials Science and Engineering A ◽

10.1016/j.msea.2016.12.082 ◽

2017 ◽

Vol 684 ◽

pp. 524-533 ◽

Cited By ~ 12

Author(s):

M. Gholami ◽

J. Vesely ◽

I. Altenberger ◽

H.-A. Kuhn ◽

M. Wollmann ◽

...

Keyword(s):

Grain Size ◽

Precipitation Hardening ◽

High Cycle Fatigue ◽

Fatigue Performance ◽

Cycle Fatigue

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Smooth and notched fatigue performance of aging treated and shot peened ZK60 magnesium alloy

Journal of Materials Research ◽

10.1557/jmr.2010.0173 ◽

2010 ◽

Vol 25 (7) ◽

pp. 1375-1387 ◽

Cited By ~ 3

Author(s):

Wen-Cai Liu ◽

Jie Dong ◽

Ping Zhang ◽

Xing-Wei Zheng ◽

Wen-Jiang Ding ◽

...

Keyword(s):

Magnesium Alloy ◽

Compressive Residual Stress ◽

High Cycle Fatigue ◽

Fatigue Performance ◽

Fatigue Properties ◽

Cycle Fatigue ◽

Notched Specimen ◽

Notched Specimens ◽

Zk60 Alloy ◽

Zk60 Magnesium Alloy

The influence of shot peening (SP) on high cycle fatigue (HCF) performance of smooth and notched specimens of hot-extruded ZK60 magnesium alloy was investigated and compared to that of hot-extruded and T5 aging-treated ZK60 magnesium alloy referred to as ZK60-T5. The increases in fatigue properties at the optimum Almen intensities were found to depend on the material states. In contrast to ZK60 alloy, higher smooth and notched fatigue properties for both unpeened and peened specimens were observed for ZK60-T5 alloy. Meanwhile, the improvement of fatigue life for notched specimen by SP was much more than that for the smooth specimen. The mechanism by which the compressive residual stress induced by SP resulted in the improvement of fatigue performance of smooth and notched specimens for ZK60 and ZK60-T5 alloys was discussed.

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