Performance of tungsten fibers for Wf/W composites under cyclic tensile load

Research output: Contribution to journalArticle

Standard

Performance of tungsten fibers for Wf/W composites under cyclic tensile load. / Terentyev, Dmitry; Dubinko, Andrii; Riesch, Johan; Lebediev, Sergii; Volkov, Illia; Zhurkin, Evgeni E.

In: International Journal of Refractory Metals & Hard Materials, Vol. 86, 105094, 10.10.2019, p. 1-9.

Research output: Contribution to journalArticle

Harvard

Terentyev, D, Dubinko, A, Riesch, J, Lebediev, S, Volkov, I & Zhurkin, EE 2019, 'Performance of tungsten fibers for Wf/W composites under cyclic tensile load', International Journal of Refractory Metals & Hard Materials, vol. 86, 105094, pp. 1-9. https://doi.org/10.1016/j.ijrmhm.2019.105094, https://doi.org/10.1016/j.ijrmhm.2019.105094

APA

Terentyev, D., Dubinko, A., Riesch, J., Lebediev, S., Volkov, I., & Zhurkin, E. E. (2019). Performance of tungsten fibers for Wf/W composites under cyclic tensile load. International Journal of Refractory Metals & Hard Materials, 86, 1-9. [105094]. https://doi.org/10.1016/j.ijrmhm.2019.105094, https://doi.org/10.1016/j.ijrmhm.2019.105094

Vancouver

Terentyev D, Dubinko A, Riesch J, Lebediev S, Volkov I, Zhurkin EE. Performance of tungsten fibers for Wf/W composites under cyclic tensile load. International Journal of Refractory Metals & Hard Materials. 2019 Oct 10;86:1-9. 105094. https://doi.org/10.1016/j.ijrmhm.2019.105094, https://doi.org/10.1016/j.ijrmhm.2019.105094

Author

Terentyev, Dmitry ; Dubinko, Andrii ; Riesch, Johan ; Lebediev, Sergii ; Volkov, Illia ; Zhurkin, Evgeni E. / Performance of tungsten fibers for Wf/W composites under cyclic tensile load. In: International Journal of Refractory Metals & Hard Materials. 2019 ; Vol. 86. pp. 1-9.

Bibtex - Download

@article{61cb1b62fd9249ee920fa011a2112f3b,
title = "Performance of tungsten fibers for Wf/W composites under cyclic tensile load",
abstract = "Toughness improved tungsten-based composites are one of the currently considered material option for future fusion reactors capable to withstand both high heat flux and irradiation induced embrittlement. Today, fiber-reinforced composites (Wf/W) are being intensively studied as risk-mitigation materials to replace bulk tungsten which is susceptible to neutron irradiation embrittlement especially below 800 °C. Operation of a material as an element of a plasma facing component (i.e. divertor monoblock or first wall armour) implies not only high heat flux exposure but also thermal cyclic fatigue caused by repetitive oscillations of the heat loads due to the nature of the plasma and the limitations on the capacity of its confinement. In this work, we assessed the performance of potassium doped tungsten fibers under cyclic loading applied in tensile mode. Stress-controlled fatigue tests were performed at room temperature, 300 °C and 500 °C increasing the load from 50{\%} of the yield strength up to the ultimate tensile strength of the studied fibers. It is revealed that significant cyclic hardening emerges as the fatigue stress limit exceeds the yield strength already within a few cycles. Despite the noticed cyclic hardening, the wire can sustain few hundreds of cycles without any detectable damage unless the cycle stress is increased to reach the value above the mean ultimate tensile strength. Given this observation, we have studied the impact of the cyclic stress (σC) on the rupture strength and total elongation of the wires exposed to twenty loading cycles varying test temperature in the range 23–500 °C. At room temperature, the rupture stress after cyclic deformation progressively increases with σC and saturates at 2.7 GPa with a moderate reduction of the total elongation, while the nominal ultimate tensile strength of the wire is 2.5 GPa. Thus, the strength of the wire is increased by 200 MPa, on average. At elevated temperature, the rupture stress after the cyclic deformation increases by more than 300 MPa.",
keywords = "Tungsten, Fiber, Cyclic fatigue, Potassium doped, Composites",
author = "Dmitry Terentyev and Andrii Dubinko and Johan Riesch and Sergii Lebediev and Illia Volkov and Zhurkin, {Evgeni E.}",
note = "Score=10",
year = "2019",
month = "10",
day = "10",
doi = "10.1016/j.ijrmhm.2019.105094",
language = "English",
volume = "86",
pages = "1--9",
journal = "International Journal of Refractory Metals & Hard Materials",
issn = "0263-4368",
publisher = "Elsevier",

}

RIS - Download

TY - JOUR

T1 - Performance of tungsten fibers for Wf/W composites under cyclic tensile load

AU - Terentyev, Dmitry

AU - Dubinko, Andrii

AU - Riesch, Johan

AU - Lebediev, Sergii

AU - Volkov, Illia

AU - Zhurkin, Evgeni E.

N1 - Score=10

PY - 2019/10/10

Y1 - 2019/10/10

N2 - Toughness improved tungsten-based composites are one of the currently considered material option for future fusion reactors capable to withstand both high heat flux and irradiation induced embrittlement. Today, fiber-reinforced composites (Wf/W) are being intensively studied as risk-mitigation materials to replace bulk tungsten which is susceptible to neutron irradiation embrittlement especially below 800 °C. Operation of a material as an element of a plasma facing component (i.e. divertor monoblock or first wall armour) implies not only high heat flux exposure but also thermal cyclic fatigue caused by repetitive oscillations of the heat loads due to the nature of the plasma and the limitations on the capacity of its confinement. In this work, we assessed the performance of potassium doped tungsten fibers under cyclic loading applied in tensile mode. Stress-controlled fatigue tests were performed at room temperature, 300 °C and 500 °C increasing the load from 50% of the yield strength up to the ultimate tensile strength of the studied fibers. It is revealed that significant cyclic hardening emerges as the fatigue stress limit exceeds the yield strength already within a few cycles. Despite the noticed cyclic hardening, the wire can sustain few hundreds of cycles without any detectable damage unless the cycle stress is increased to reach the value above the mean ultimate tensile strength. Given this observation, we have studied the impact of the cyclic stress (σC) on the rupture strength and total elongation of the wires exposed to twenty loading cycles varying test temperature in the range 23–500 °C. At room temperature, the rupture stress after cyclic deformation progressively increases with σC and saturates at 2.7 GPa with a moderate reduction of the total elongation, while the nominal ultimate tensile strength of the wire is 2.5 GPa. Thus, the strength of the wire is increased by 200 MPa, on average. At elevated temperature, the rupture stress after the cyclic deformation increases by more than 300 MPa.

AB - Toughness improved tungsten-based composites are one of the currently considered material option for future fusion reactors capable to withstand both high heat flux and irradiation induced embrittlement. Today, fiber-reinforced composites (Wf/W) are being intensively studied as risk-mitigation materials to replace bulk tungsten which is susceptible to neutron irradiation embrittlement especially below 800 °C. Operation of a material as an element of a plasma facing component (i.e. divertor monoblock or first wall armour) implies not only high heat flux exposure but also thermal cyclic fatigue caused by repetitive oscillations of the heat loads due to the nature of the plasma and the limitations on the capacity of its confinement. In this work, we assessed the performance of potassium doped tungsten fibers under cyclic loading applied in tensile mode. Stress-controlled fatigue tests were performed at room temperature, 300 °C and 500 °C increasing the load from 50% of the yield strength up to the ultimate tensile strength of the studied fibers. It is revealed that significant cyclic hardening emerges as the fatigue stress limit exceeds the yield strength already within a few cycles. Despite the noticed cyclic hardening, the wire can sustain few hundreds of cycles without any detectable damage unless the cycle stress is increased to reach the value above the mean ultimate tensile strength. Given this observation, we have studied the impact of the cyclic stress (σC) on the rupture strength and total elongation of the wires exposed to twenty loading cycles varying test temperature in the range 23–500 °C. At room temperature, the rupture stress after cyclic deformation progressively increases with σC and saturates at 2.7 GPa with a moderate reduction of the total elongation, while the nominal ultimate tensile strength of the wire is 2.5 GPa. Thus, the strength of the wire is increased by 200 MPa, on average. At elevated temperature, the rupture stress after the cyclic deformation increases by more than 300 MPa.

KW - Tungsten

KW - Fiber

KW - Cyclic fatigue

KW - Potassium doped

KW - Composites

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/35981063

U2 - 10.1016/j.ijrmhm.2019.105094

DO - 10.1016/j.ijrmhm.2019.105094

M3 - Article

VL - 86

SP - 1

EP - 9

JO - International Journal of Refractory Metals & Hard Materials

JF - International Journal of Refractory Metals & Hard Materials

SN - 0263-4368

M1 - 105094

ER -

ID: 5701533