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It was revealed, that the cracks initiate at the grain boundary of maximum misorientation factor calculated for each specimen.
Furthermore, the calculated maximum misorientation factor per specimen show a direct relation to the number of cycles to failure and can be used as an additional microstructural information for statistically based fatigue life prediction models.
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They can be characterized by ψ, the maximum misorientation angle of the crystal lattice.
Fig. 1 Maximum misorientation angle Ψ of the ε-martensite (1) and the austenite (2) versus number of γ-ε-γ cycles.
The amount of the grain boundary sliding showed a good correlation with the misorientation factor of each boundary.
The maximum misorientation angle ψ, which characterizes the degree of the structural fragmentation, was determined from the azimuthal smearing of the (200)γ and (002)α reflections of the reverted austenite and the martensite.
The maximum misorientation angle, ψ, which characterizes grain fragmentation, was determined from azimuthal smearing of the (200)γ reflections of austenite and the (002) α reflections of martensite in diffraction pattern of single-crystal specimens.
The maximum misorientation angle ψ of the crystal lattice, which characterizes the degree of structure fragmentation, was found from azimuthal tailing of diffraction reflections compared to single-crystalline samples.
For small indentations a constant ratio between the maximum misorientation beneath the indent flanks and the diameter of the imprint was found.
In particular in the VHCF regime, the misorientation factor developed by Blochwitz et al. (1997), which depends on the misorientation angle between two adjacent grains as well as on the orientation of their boundary with respect to the external load, was used to estimate the stress concentration at the grain boundaries.
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