Deformation microstructure and tensile properties of Alloy 709 at different temperatures

Rengen Ding; Jin Yan; Hangyue Li; Suyang Yu; Afsaneh Rabiei; Paul Bowen

doi:10.1016/j.matdes.2019.107843

Deformation microstructure and tensile properties of Alloy 709 at different temperatures

Rengen Ding, Jin Yan, Hangyue Li, Suyang Yu, Afsaneh Rabiei, Paul Bowen

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Abstract

Alloy 709 austenitic stainless steel is being investigated as a candidate structural material for the next generation fast neutron reactors at service temperature of 500–550 °C. However, the study of deformation mechanisms on Alloy 709 and of tensile response of aged Alloy 709 is lacking. In this study, thus, the tensile behaviour of as-received and aged Alloy 709, their deformation microstructures and failure mechanisms, have been investigated at room temperature (RT), 550, 650 and 750 °C. Aging brought about the formation of particles at grain boundaries and interior of grain, thus leading to enhancement of yield strength but reduction in ductility. The ultimate strength of both materials is strongly temperature dependent, which clearly decreases with temperature. It is caused by the decreasing strain hardening ability, dynamic strain aging and dynamic recovery together with dynamic recrystallisation at different temperatures.

Original language	English
Article number	107843
Pages (from-to)	107843
Journal	Materials and Design
Volume	176
DOIs	https://doi.org/10.1016/j.matdes.2019.107843
Publication status	Published - 15 Aug 2019

Keywords

Alloy 709
Microstructure
TEM
Tensile

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abstract = "Alloy 709 austenitic stainless steel is being investigated as a candidate structural material for the next generation fast neutron reactors at service temperature of 500–550 °C. However, the study of deformation mechanisms on Alloy 709 and of tensile response of aged Alloy 709 is lacking. In this study, thus, the tensile behaviour of as-received and aged Alloy 709, their deformation microstructures and failure mechanisms, have been investigated at room temperature (RT), 550, 650 and 750 °C. Aging brought about the formation of particles at grain boundaries and interior of grain, thus leading to enhancement of yield strength but reduction in ductility. The ultimate strength of both materials is strongly temperature dependent, which clearly decreases with temperature. It is caused by the decreasing strain hardening ability, dynamic strain aging and dynamic recovery together with dynamic recrystallisation at different temperatures.",

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AU - Ding, Rengen

AU - Yan, Jin

AU - Li, Hangyue

AU - Yu, Suyang

AU - Rabiei, Afsaneh

AU - Bowen, Paul

PY - 2019/8/15

Y1 - 2019/8/15

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Deformation microstructure and tensile properties of Alloy 709 at different temperatures

Abstract

Keywords

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