Accelerated Creep Testing of Inconel 718 Using the Stepped Isostress Method (SSM)

Stewart, Calvin M.; Hossain, Md Abir; Pellicotte, Jacob; Mach, Robert; Alexander, David; Siddiqui, Sanna F.

doi:10.1520/mpc20200174

Accelerated Creep Testing of Inconel 718 Using the Stepped Isostress Method (SSM)

Journal Article · Mon Jun 21 00:00:00 EDT 2021 · Materials Performance and Characterization

DOI:https://doi.org/10.1520/mpc20200174· OSTI ID:1785362

^[1]; Hossain, Md Abir ^[2]; Pellicotte, Jacob ^[2]; Mach, Robert ^[2]; Alexander, David ^[2]; Siddiqui, Sanna F. ^[3]

Univ. of Texas at El Paso, TX (United States); The University of Texas at El Paso
Univ. of Texas at El Paso, TX (United States)
Florida Polytechnic Univ., Lakeland, FL (United States)

This paper demonstrates the stepped isostress method (SSM); an accelerated creep test (ACT) for the rapid assessment of metallic materials. The SSM test is based on the time-temperature-stress superposition principle (TTSSP) where temperature and/or stress are step increased to accelerate the time-to-rupture. The SSM test has proven successful for the ACT of polymers and polymeric composites but has yet to be proven for metallic materials. In this study, new test matrix design rules for the SSM of metals are established based on deformation mechanism, time-temperature transformation, and time-temperature precipitation maps. A test matrix of SSM and conventional creep tests (CCTs) are executed for alloy Inconel 718 at 750°C (1382°F) with stress levels ranging from 100 to 350 MPa. Validation CCT data is gathered from the Japan National Institute of Material Science (NIMS). Material constants for the Sine-hyperbolic (Sinh) constitutive model are calibrated using the SSM data and employed to predict the conventional creep response. Here, when blindly compared to the CCT data, the SSM calibrated Sinh model can accurately predict the conventional creep response across logarithmic decades and thus accelerate the capture of conventional creep data. Fractography indicates ductile fracture by transgranular microvoid coalescence (TMVC) with the same fracture mode observed in both SSM and CCT specimens. Creep cavitation is indicated by the population, smoothness, and size of microvoids.

View Accepted Manuscript (DOE)

Research Organization:: University of Texas at El Paso, TX (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0027581

OSTI ID:: 1785362

Report Number(s):: DOE-UTEP--30331-2

Journal Information:: Materials Performance and Characterization, Journal Name: Materials Performance and Characterization Journal Issue: 2 Vol. 11; ISSN 2379-1365

Publisher:: ASTM InternationalCopyright Statement

Country of Publication:: United States

Language:: English

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