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Meeting Materials Science & Technology 2017
Symposium Fifty Years of Metallography and Materials Characterization
Presentation Title Correlating Variability in Fatigue Life with Fracture Mechanisms in a Near-α Titanium Alloy
Author(s) Vikas Sinha, Sushant Jha, Adam Pilchak, William Porter, Reji John, James Larsen
On-Site Speaker (Planned) Vikas Sinha
Abstract Scope Unlike the quasi-static mechanical properties, such as strength and ductility, fatigue life can vary significantly for nominally identical material and test conditions in many materials, including Ti-alloys. This makes life prediction and management more challenging for components that are subjected to cyclic loading in service. The differences in fracture mechanisms can cause the variations in fatigue life. In this study, the fatigue fracture mechanisms are investigated in a near-<I>α</I> titanium alloy, Ti-6Al-2Sn-4Zr-2Mo, which had been tested under condition that resulted in life variations by more than an order of magnitude. Both short and long life specimens are examined for this alloy in two different microstructural conditions. The crack-initiation and small crack growth processes, including their contributions to fatigue life variability, are elucidated via quantitative characterization of fatigue fracture surfaces. The spatial and crystallographic orientations of fracture features were determined in an SEM with quantitative tilt fractography and EBSD, respectively.
Proceedings Inclusion? Planned: Publication outside of MS&T

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Metallographic Study on the Diffusion Behavior and Microstructural Transformations in Silicon-containing Powder Metallurgy Steels
Advanced Analytical Microscopy: Metallographic Characterization for the Next Fifty Years
Applying In Situ S/TEM Microscopy to Structural Materials Using MEMS-based Closed-cell Gas-reactions – Challenges and Prospects
Characterization of Transition-Iron-Carbide Precipitates
Correlating Variability in Fatigue Life with Fracture Mechanisms in a Near-α Titanium Alloy
Delving into the World of Grain Boundaries with Electron Microscopy
Failure of a Reformer Furnace by "Surge"
How Microscopy Can Help to Save Energy, Save Lives, Create Jobs and Improve Our Health
Improving the Precision of Microindentation Hardness Data
K-3: Automated Optical Microstructural Characterization of Thermal Spray Coatings
K-4: Advances in Automated Optical 3D Materials Characterization
Metallographic Analysis of Cu-Nb Nanolaminates Using Polarized Light Optical Microscopy
Metallographic Analysis of KAB Nanostructured Steels
Microanalysis of Microscopy Evaluation of Mechanical Property Changes due to Low Temperature Thermal Treatment of a Steel
Microstructural Developments in Dual-phase and Advanced High Strength Steels
Next Step in Complex Microstructure Classification – How to Replace Subjective Expert Bias by 3D Information and Autonomous Procedures?
Oxidation Behavior of Tungsten Carbide-6% Cobalt Cemented Carbide
Proclamation, Publication and Progress
Quantitative Microstructure Analysis by TriBeam Tomography
Three Dimensional (3D) Analysis of White Etching Regions in AISI M50 Bearing Steel

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