PSI - Issue 42

Liese Vandewalle et al. / Procedia Structural Integrity 42 (2022) 1428–1435 Vandewalle et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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of C atoms at the responsible dislocations, leading to dislocation pinning, or to faster annihilation of dislocation segments via easier glide. Tensile straining of the recovered condition did not re-introduce the H-CW peak, despite the generation of fresh dislocations. This was related to an insufficient dislocation density as well as a too small mean free length due to many dislocation pinning points. Torsional deformation did lead to reappearance of the H-CW peak. Again, low temperature annealing indicated a more rapid decrease of PH2. Analysis based on existing models describing the H-CW peak resulted in identification of the dislocations involved in PH2 as non-screw type dislocations and in PH1 as screw type dislocations. Therefore, analysis of the H-CW peak can provide additional information on the dislocation types interacting with H. 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