On the biaxial thermal creep-fatigue behavior of Ni-base Alloy 617 at 950 °C

Yang Zhong; Xiang Liu; Kuan Che Lan; Hoon Lee; D. K.L. Tsang; James F. Stubbins

doi:10.1016/j.ijfatigue.2020.105787

On the biaxial thermal creep-fatigue behavior of Ni-base Alloy 617 at 950 °C

Yang Zhong, Xiang Liu, Kuan Che Lan, Hoon Lee, D. K.L. Tsang, James F. Stubbins

Nuclear, Plasma, and Radiological Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

A new in-situ biaxial creep-fatigue testing system was built to study the creep-fatigue interaction of Alloy 617, a nickel base alloy with potential structural applications in the Very High Temperature Reactor, up to 70 MPa at 950 °C. The results show that creep-fatigue life of Alloy 617 is reduced with increasing hold time and the cracking mode seems to be intergranular in all creep-fatigue samples. At the microstructural level, both cellular network dislocations and slip bands were observed in the creep-fatigue tested specimens. The portion of slip bands seems to increase with increasing fatigue damage fraction. Moreover, the dislocation density increased with increasing effective stress.

Original language	English (US)
Article number	105787
Journal	International Journal of Fatigue
Volume	139
DOIs	https://doi.org/10.1016/j.ijfatigue.2020.105787
State	Published - Oct 2020

Keywords

Alloy 617
Biaxial test system
Creep-fatigue

ASJC Scopus subject areas

Modeling and Simulation
General Materials Science
Mechanics of Materials
Mechanical Engineering
Industrial and Manufacturing Engineering

Online availability

10.1016/j.ijfatigue.2020.105787

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title = "On the biaxial thermal creep-fatigue behavior of Ni-base Alloy 617 at 950 °C",

abstract = "A new in-situ biaxial creep-fatigue testing system was built to study the creep-fatigue interaction of Alloy 617, a nickel base alloy with potential structural applications in the Very High Temperature Reactor, up to 70 MPa at 950 °C. The results show that creep-fatigue life of Alloy 617 is reduced with increasing hold time and the cracking mode seems to be intergranular in all creep-fatigue samples. At the microstructural level, both cellular network dislocations and slip bands were observed in the creep-fatigue tested specimens. The portion of slip bands seems to increase with increasing fatigue damage fraction. Moreover, the dislocation density increased with increasing effective stress.",

keywords = "Alloy 617, Biaxial test system, Creep-fatigue",

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AU - Zhong, Yang

AU - Liu, Xiang

AU - Lan, Kuan Che

AU - Lee, Hoon

AU - Tsang, D. K.L.

AU - Stubbins, James F.

PY - 2020/10

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N2 - A new in-situ biaxial creep-fatigue testing system was built to study the creep-fatigue interaction of Alloy 617, a nickel base alloy with potential structural applications in the Very High Temperature Reactor, up to 70 MPa at 950 °C. The results show that creep-fatigue life of Alloy 617 is reduced with increasing hold time and the cracking mode seems to be intergranular in all creep-fatigue samples. At the microstructural level, both cellular network dislocations and slip bands were observed in the creep-fatigue tested specimens. The portion of slip bands seems to increase with increasing fatigue damage fraction. Moreover, the dislocation density increased with increasing effective stress.

AB - A new in-situ biaxial creep-fatigue testing system was built to study the creep-fatigue interaction of Alloy 617, a nickel base alloy with potential structural applications in the Very High Temperature Reactor, up to 70 MPa at 950 °C. The results show that creep-fatigue life of Alloy 617 is reduced with increasing hold time and the cracking mode seems to be intergranular in all creep-fatigue samples. At the microstructural level, both cellular network dislocations and slip bands were observed in the creep-fatigue tested specimens. The portion of slip bands seems to increase with increasing fatigue damage fraction. Moreover, the dislocation density increased with increasing effective stress.

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On the biaxial thermal creep-fatigue behavior of Ni-base Alloy 617 at 950 °C

Abstract

Keywords

ASJC Scopus subject areas

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