High temperature low cycle fatigue characterization of equiaxed MAR-M-247

Gianluca Maggiani; Matthew Roy; Philip Withers

doi:10.1016/j.ijfatigue.2019.02.021

High temperature low cycle fatigue characterization of equiaxed MAR-M-247

Gianluca Maggiani, Matthew Roy, Philip Withers

Materials Engineering

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Abstract

Low cycle fatigue tests have been performed at 1038C on equiaxed MAR-M-247 under a mean compressive strain. Strain ranges assessed were 0.4, 0.6 and 0.8%, with this test program reflecting industrial gas turbine duty cycles. Fractographic analysis demonstrated transgranular crack propagation with intergranular fast fracture. Heavily oxidized secondary cracks were observed throughout. The details of a Lemaitre-Chaboche constitutive model that has been applied to the experimental stress-strain response are described. It was found
that this model was capable of capturing both plastic shakedown and kinematic hardening effects with a high degree of accuracy (R2 up to 0.997 and SSE up to 6E+4). The suitability of extending this model to address different strain histories are detailed.

Original language	English
Pages (from-to)	225-237
Number of pages	13
Journal	International Journal of Fatigue
Volume	123
Early online date	19 Feb 2019
DOIs	https://doi.org/10.1016/j.ijfatigue.2019.02.021
Publication status	Published - 2019

Keywords

Fracture
Lemaitre-Chaboche
Low cycle fatigue
MAR-M-247

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10.1016/j.ijfatigue.2019.02.021

Mar_M_247_High_Temp_LCFAccepted author manuscript, 10.1 MBLicence: CC BY-NC-ND

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title = "High temperature low cycle fatigue characterization of equiaxed MAR-M-247",

abstract = "Low cycle fatigue tests have been performed at 1038C on equiaxed MAR-M-247 under a mean compressive strain. Strain ranges assessed were 0.4, 0.6 and 0.8%, with this test program reflecting industrial gas turbine duty cycles. Fractographic analysis demonstrated transgranular crack propagation with intergranular fast fracture. Heavily oxidized secondary cracks were observed throughout. The details of a Lemaitre-Chaboche constitutive model that has been applied to the experimental stress-strain response are described. It was foundthat this model was capable of capturing both plastic shakedown and kinematic hardening effects with a high degree of accuracy (R2 up to 0.997 and SSE up to 6E+4). The suitability of extending this model to address different strain histories are detailed.",

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AU - Maggiani, Gianluca

AU - Roy, Matthew

AU - Withers, Philip

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AB - Low cycle fatigue tests have been performed at 1038C on equiaxed MAR-M-247 under a mean compressive strain. Strain ranges assessed were 0.4, 0.6 and 0.8%, with this test program reflecting industrial gas turbine duty cycles. Fractographic analysis demonstrated transgranular crack propagation with intergranular fast fracture. Heavily oxidized secondary cracks were observed throughout. The details of a Lemaitre-Chaboche constitutive model that has been applied to the experimental stress-strain response are described. It was foundthat this model was capable of capturing both plastic shakedown and kinematic hardening effects with a high degree of accuracy (R2 up to 0.997 and SSE up to 6E+4). The suitability of extending this model to address different strain histories are detailed.

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JO - International Journal of Fatigue

JF - International Journal of Fatigue

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High temperature low cycle fatigue characterization of equiaxed MAR-M-247

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