Fatigue crack growth resistance of the austenitic stainless steel Alloy 709 at elevated temperatures

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

Journal of Materials Research and Technology (Nov 2020)

Fatigue crack growth resistance of the austenitic stainless steel Alloy 709 at elevated temperatures

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

Affiliations

Suyang Yu: School of Metallurgy and Materials, College of Engineering and Physical Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK; Corresponding author.
Jin Yan: School of Metallurgy and Materials, College of Engineering and Physical Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
Hangyue Li: School of Metallurgy and Materials, College of Engineering and Physical Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
Rengen Ding: School of Metallurgy and Materials, College of Engineering and Physical Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
Amrita Lall: Department of Mechanical and Aerospace Engineering, North Carolina State University, 911 Oval Dr, Raleigh, NC 27695-7910, USA
Afsaneh Rabiei: Department of Mechanical and Aerospace Engineering, North Carolina State University, 911 Oval Dr, Raleigh, NC 27695-7910, USA
Paul Bowen: School of Metallurgy and Materials, College of Engineering and Physical Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK

Journal volume & issue: Vol. 9, no. 6
pp. 12955 – 12969

Abstract

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Fatigue crack growth resistance of an austenitic stainless steel Alloy 709 has been evaluated at temperatures of 550, 650 and 750 °C in air and vacuum. Tests were conducted at a frequency of 0.25 Hz and a stress ratio of 0.1. The linear elastic stress intensity factor range (ΔK) has been used to characterise fatigue crack growth resistance. A modest detrimental effect of air at elevated temperatures on fatigue crack growth is identified and discussed. Striated transgranular fatigue is found to be the failure mechanism for all test conditions. The formation of striations and the interaction of crack growth with slip traces are further investigated using in-situ testing (within a scanning electron microscope), together with transmission electron microscopy carried out on samples extracted by focused ion-beam milling perpendicular to fracture surfaces. Finally, an analytical model is proposed to predict fatigue crack growth in air for Alloy 709.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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