Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/9657
Title: Mechanical srtess relaxation of a laser penned and shot penned ni-based superalloy
Authors: Chin, KS
Idapalapati, S
Paradowska, AM
Reid, M
Shukla, S
Ardi, DT
Keywords: Stresses
Heat resisting alloys
Shot peening
Lasers
Hardening
Neutron diffraction
Backscattering
In-situ processing
Fatigue
Mechanical properties
Tensile properties
Loading
Issue Date: 31-Aug-2019
Publisher: Springer Nature Switzerland AG.
Citation: Chin K.S., Idapalapati S., Paradowska A., Reid M., Shukla S., Ardi D.T. (2020) Mechanical stress relaxation of a laser peened and shot peened ni-based superalloy. In: Itoh S., Shukla S. (eds) Advanced Surface Enhancement. International Conference on Advanced Surface Enhancement (INCASE2019), 10-13th September, Singapore. (pp. 182-189).
Abstract: Nickel based superalloy IN718 specimens were subjected to laser peening and shot peening. The residual stress and work hardening introduced by laser peening and shot peening were characterized using neutron diffraction method and electron backscattered diffraction (EBSD). A modified set up in reflective mode was utilized during neutron diffraction to optimize the spatial and temporal resolution to perform in-situ residual stress measurements at pre-determined cycle. Residual stress relaxation was only observed in the direction of loading while the residual stress in the transverse direction remained at a similar magnitude. Residual stress relaxation was observed to be most prominent in the first cycle of fatigue at R ratio = 0.1 with little stress relaxation in subsequent fatigue load cycles. Under tensile-tensile loading, stress relaxation occurs when the superposition of tensile residual stress and applied loading exceeds the localized yield strength of the material. Stress relaxation was found to be well correlated with the magnitude of work hardening. Residual stress relaxation as a function of depth and number of cycles were also recorded to illustrate the changes in residual stress during the cyclic loading. © 2020 Springer Nature Switzerland AG.
Gov't Doc #: 9689
URI: https://doi.org/10.1007/978-981-15-0054-1_19
http://apo.ansto.gov.au/dspace/handle/10238/9657
ISBN: 9789811500541
9789811500534
Appears in Collections:Book Chapters

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