The flow stress assessment of austenitic-martensitic functionally graded steel under hot compression

The strength to weight ratio and oxidation resistance of NiAl make this ordered intermetallic, with some modifications, an attractive candidate to compete with many superalloys for high temperature applications. Recent studies have shown that the inherent brittleness of many polycrystalline intermetallics can be overcome by micro and macroalloying. It has also been found that the high temperature mechanical properties of NiAl can be enhanced through the addition of Nb by powder metallurgical techniques forming a dispersed second phase through interdiffusion in a polycrystalline matrix. A drop in the flow stress is observed however in a NiAl-2 at.% Nb alloy after 0.2 % strain during constant strain rate hot compression testing at 1025°C. The object of this investigation was to identify the second phase and to determine the cause of the flow stress drop.

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Flow Stress Behavior and Microstructural Evolution of DC Cast 7065 Aluminum Alloy During Hot Compression Deformation

Journal of Physics Conference Series ◽

10.1088/1742-6596/1885/3/032067 ◽

2021 ◽

Vol 1885 (3) ◽

pp. 032067

Author(s):

Kezhun He ◽

Zimeng Tan ◽

Xu Zheng ◽

Xinming Zhang ◽

Biao Chen ◽

...

Keyword(s):

Aluminum Alloy ◽

Flow Stress ◽

Microstructural Evolution ◽

Hot Compression ◽

Hot Compression Deformation ◽

Stress Behavior ◽

Compression Deformation ◽

Flow Stress Behavior

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Flow stress behavior and processing map of Al-Cu-Mg-Ag alloy during hot compression

Journal of Wuhan University of Technology-Mater Sci Ed ◽

10.1007/s11595-007-5694-x ◽

2008 ◽

Vol 23 (5) ◽

pp. 694-698 ◽

Cited By ~ 5

Author(s):

Sheng Yang ◽

Danqing Yi ◽

Hong Zhang ◽

Sujuan Yao

Keyword(s):

Flow Stress ◽

Processing Map ◽

Hot Compression ◽

Stress Behavior ◽

Flow Stress Behavior

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Modelling of Flow Stress and Prediction of Workability by Processing Map for Hot Compression of 43CrNi Steel

ISIJ International ◽

10.2355/isijinternational.isijint-2016-306 ◽

2017 ◽

Vol 57 (3) ◽

pp. 497-505 ◽

Cited By ~ 14

Author(s):

Niranjan Kumar ◽

Sanjeev Kumar ◽

Sunil Kumar Rajput ◽

Sumeer Kumar Nath

Keyword(s):

Flow Stress ◽

Processing Map ◽

Hot Compression

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Hot Deformation Behaviors of SiCp/Al Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1058.165 ◽

2014 ◽

Vol 1058 ◽

pp. 165-169 ◽

Cited By ~ 1

Author(s):

Shi Ming Hao ◽

Jing Pei Xie

Keyword(s):

Flow Stress ◽

Strain Rate ◽

Hot Deformation ◽

True Strain ◽

Constant Strain Rate ◽

Hot Compression ◽

Compression Tests ◽

Sensitive Material ◽

2024 Aluminum Alloy ◽

Deformation Behaviors

The hot deformation behaviors of 30%SiCp/2024 aluminum alloy composites was studied by hot compression tests using Gleeble-1500 thermomechanical simulator at temperatures ranging from 350-500°C under strain rates of 0.01-10 s-1. The true stress-true strain curves were obtained in the tests. Constitutive equation and processing map were established. The results show that the flow stress decreases with the increase of deformation temperature at a constant strain rate, and increases with the increase of strain rate at constant temperature, indicating that composite is a positive strain rate sensitive material. The flow stress behavior of composite during hot compression deformation can be represented by a Zener-Hollomon parameter in the hyperbolic sine form. Its activation energy for hot deformation Q is 183.251 kJ/mol. The optimum hot working conditions for this material are suggested.

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