Effect of hold time on high temperature creep-fatigue behavior of Fe–25Ni–20Cr (wt.%) austenitic stainless steel (Alloy 709)

Alsmadi, Zeinab Y.; Alomari, Abdullah; Kumar, N.; Murty, K. L.

doi:10.1016/j.msea.2019.138591

Effect of hold time on high temperature creep-fatigue behavior of Fe–25Ni–20Cr (wt.%) austenitic stainless steel (Alloy 709)

Journal Article · Thu Oct 24 00:00:00 EDT 2019 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2019.138591· OSTI ID:1848147

Alsmadi, Zeinab Y. ^[1]; Alomari, Abdullah ^[2]; Kumar, N. ^[3]; Murty, K. L. ^[4]

North Carolina State Univ., Raleigh, NC (United States). Dept. of Nuclear Engineering; North Carolina State Univ., Raleigh, NC (United States)
North Carolina State Univ., Raleigh, NC (United States). Dept. of Nuclear Engineering; King Abdulaziz Univ., Jeddah (Saudi Arabia). City for Science and Technology. Nuclear Science Research Inst.
Univ. of Alabama, Tuscaloosa, AL (United States). Metallurgical and Materials Engineering
North Carolina State Univ., Raleigh, NC (United States). Dept. of Nuclear Engineering

To understand high temperature creep-fatigue interaction of the Alloy 709, strain-controlled low-cycle fatigue (LCF) tests were performed at strain ranges varying from 0.3% to 1.2% with fully reversible cycle of triangular waveform at 750 °C. In addition, different hold times of 60, 600, 1800 and 3600 s were introduced at the maximum tensile strain to investigate the effect of creep damage on the fatigue-life at strain range of 1% at 750 °C. The creep-fatigue life and the number of cycles to macro-crack initiation and failure are found to decrease with increasing hold time indicating higher crack initiation and growth rates. Creep-fatigue life is evaluated by a linear summation of fractions of cyclic and creep damages according to ASME code. The fractographs of the samples deformed at 1% strain range indicated that fatigue might have been the dominant mode of deformation whereas, for the samples deformed at the same strain range with different hold times, both fatigue and creep have contributed to the overall deformation and fracture of the alloy.

View Accepted Manuscript (DOE)

Research Organization:: North Carolina State Univ., Raleigh, NC (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: NE0008452

OSTI ID:: 1848147

Alternate ID(s):: OSTI ID: 1693837

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Journal Issue: C Vol. 771; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Advanced austenitic stainless steel
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Hold time
Intergranular
Low-cycle fatigue
Materials Science
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Effect of hold time on high temperature creep-fatigue behavior of Fe–25Ni–20Cr (wt.%) austenitic stainless steel (Alloy 709)

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