Mechanical properties of spinodally decomposed Fe-Cr and Fe-Cr-Mo alloys
Thesis/Dissertation
·
OSTI ID:6468140
Age-hardening due to spinodal decomposition in Fe-30wt%Cr and Fe-26wt%Cr-1wt%Mo alloys was studied. The yield stress was measured using monotonic tensile tests over a temperature range from 77 to 473 K, and dislocation microstructures were examined by TEM. It was observed that the incremental yield stress due to aging is essentially test temperature independent and increases substantially with increasing aging time as long as deformation occurs in a slip dominant mode. The TEM observation showed many dislocation pile ups for aged materials while as-quenched materials exhibited a homogeneous dislocation distribution. The composition profile and the internal stress field due to isotropic decomposition was calculated using Cahn's multiwave superposition method. The calculated results suggest that the coherent internal stress field due to the misfit effect is dominant for age hardening phenomenon. The low-cycle fatigue of spinodally decomposed Fe-26Cr-1Mo high purity ferritic stainless steel was studied in comparison with the solution treated homogeneous state under constant plastic strains and strain rates at room temperature.
- Research Organization:
- Northwestern Univ., Evanston, IL (USA)
- OSTI ID:
- 6468140
- Country of Publication:
- United States
- Language:
- English
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