Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 8 of 8 for “"Dynamic Strain Aging"”.
-
Thermo-mechanical response and plastic deformation behavior of Hastelloy X at elevated temperatures — role of dynamic strain aging
… loading is investigated, and the phenomenon of dynamic strain aging is studied under isothermal and temperature jump experiments, using the technique of digital image correlation (DIC). The material of interest, a Ni-based superalloy, is widely used in high temperature applications, and it is …
-
Effect of dislocation substructure on the primary creep behavior of alpha titanium at elevated temperature
… rate. This anomalous behavior is attributed to dynamic strain aging. The effect vanishes due to interstitial solute depletion as the interstitials are swept from the lattice by moving dislocations. The prestrained and recovered samples tested at 60006 did not show a creep arrest. This is …
-
Experimental Characterization of Heterogeneous Deformation Due to Phase Transformations, Twinning, and Slip Deformation Using Digital Image Correlation
… transformation sequence, nuances of the stress-strain curve such as strain hardening and softening, the hysteretic behavior, the strain-rate dependence, twinning strain, twin-twin intersections, twin fraction evolution, dynamic strain aging, grain interactions, mesoscopic slip bands, and a RVE …
-
Chemistry, design, and processing of two-stage TRIP steel
… α</sup><sub>Chem</sub>. A model for the strain energy, ΔG<sup>λ→α</sup><sub>str</sub>, was formulated utilizing the Young’s modulus (E), lattice misfit squared (δ²), and molar volume (Ω) which opposed the chemical driving force for α-martensite formation. The M<sup>α</sup><sub>S</sub> was …
-
Elevated temperature mechanical properties of line pipe steels
The effects of deformation temperature near the dynamic strain aging (DSA) regime on the tensile properties of X70 and X52 line pipe steels were evaluated. Testing temperatures of interest were in the range of 25 to 350 °C, at engineering strain rates in the range of approximately 10 4 to 10 3 s 1. …
-
On the observations of autowaves and avalanches in an aluminum magnesium alloy
… local deformation characteristics look like in a dynamically strain aging material before the onset of macroscopic instability. A solution strengthened aluminum magnesium alloy was tested in a work hardened condition in uniaxial tension under a constant applied displacement rate. In situ digital …
-
Elevated temperature mechanical properties of line pipe steels
… Deformation behavior, ductility, strength, strain hardening rate, strain rate sensitivity, and fracture behavior were characterized at room temperature and in the temperature range of 200-350 °C, the potential operating range for steels used in oil production by the steam assisted gravity …
-
Microstructural evolution and mechanical behavior in nickel based alloys for very high temperature reactor
… long-term degradation process during thermal aging. First, mechanical properties of both alloys were studied by performing tensile tests at three different strain rates and at temperatures up to 1000ºC. This range covers time-dependent (plasticity) to time-independent (creep) deformations. At …