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Title: Investigation of fatigue crack initiation from a non-metallic inclusion via high energy x-ray diffraction microscopy

Journal Article · · Acta Materialia
 [1]; ORCiD logo [1];  [2];  [3];  [4];  [4];  [4];  [5];  [2];  [6]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Air Force Research Lab., Wright-Patterson AFB, OH (United States)
  3. Air Force Research Lab., Wright-Patterson AFB, OH (United States); Nutonian Inc., Somerville, MA (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. Rolls-Royce plc, Derby (United Kingdom)

Crack initiation at inclusions is a dominant, unavoidable and life-limiting failure mechanism of important structural materials. Fatigue progresses in a complex manner to find the ‘weakest link’ in the microstructure, leading to crack nucleation. In this study, fully 3-D characterization methods using high-energy synchrotron x-rays are combined with in-situ mechanical testing to study the crack initiation mechanism in a Ni-based superalloy specimen. The specimen was produced via powder metallurgy and seeded with a non-metallic inclusion. Two x-ray techniques were employed: absorption contrast computed micro-tomography (μ-CT) to determine the morphology of the inclusion and its location in the gauge section of the specimen; and far-field high-energy diffraction microscopy (FF-HEDM) to resolve the centroids, average orientations, and lattice strains of the individual grains comprising the microstructure surrounding the inclusion. Sequential μ-CT and FF-HEDM scans were carried out at both peak and zero applied stress following schedules of cyclic deformation. The µ-CT data showed the onset and location of crack initiation, and the FF-HEDM data provided temporal and spatial evolution of the intergranular strains. Strain partitioning and the associated stress heterogeneities that develop are shown to stabilize within a few loading cycles. Elasto-viscoplastic fast Fourier transform simulations were utilized to supplement interpretation of the experimental stress distributions and compared with the experimental stress distributions. In conclusion, appropriate conditions for crack nucleation in the form of stress gradients were demonstrated and created by virtue of the inclusion, specifically the residual stress state and local bonding state at the inclusion-matrix interface.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Air Force Research Laboratory (AFRL), Air Force Office of Scientific Research (AFOSR); Rolls Royce Plc; Air Force Research Laboratory (AFRL), Materials and Manufacturing Directorate
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1392597
Alternate ID(s):
OSTI ID: 1549546
Journal Information:
Acta Materialia, Vol. 137, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 72 works
Citation information provided by
Web of Science

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Cited By (6)

Demonstration of a chamber for strain mapping of steel specimens under mechanical load in a hydrogen environment by synchrotron radiation journal June 2018
In-Situ Grain Resolved Stress Characterization During Damage Initiation in Cu-10%W Alloy journal July 2019
Micromechanical Modeling of Fatigue Crack Nucleation around Non-Metallic Inclusions in Martensitic High-Strength Steels journal November 2019
Crystallographic character of grain boundaries resistant to hydrogen-assisted fracture in Ni-base alloy 725 journal August 2018
Intragranular three-dimensional stress tensor fields in plastically deformed polycrystals journal December 2019
In situ synchrotron ultrasonic fatigue testing device for 3D characterisation of internal crack initiation and growth
  • Messager, Alexandre; Junet, Arnaud; Palin‐Luc, Thierry
  • Fatigue & Fracture of Engineering Materials & Structures, Vol. 43, Issue 3 https://doi.org/10.1111/ffe.13140
journal October 2019