Abstract
Plastic effects during sheet metal forming can lead to undesirable distortions in formed components. Here, the three-stage work hardening and plastic strain recovery ("springback") in a cold-rolled, α-phase commercially pure titanium is examined. Interrupted standard tensile tests with in situ x-ray diffraction and quasi-in situ electron backscatter diffraction show that twinning plays a minor role in both of these phenomena. The experiments give evidence that the observed work hardening plateau is the result of an abrupt activation and multiplication of 〈c+a〉 slip and a subsequent redistribution of load between grain families. The springback can be attributed to inelastic backwards motion and annihilation of dislocations, driven by backstresses from dislocation-based hardening during loading. The peak broadening behavior, observed by x-ray diffraction, suggests that the internal stress state is highest in the rolling direction, resulting in consistently higher springback magnitude along this direction.
Original language | English |
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Pages (from-to) | 87-98 |
Number of pages | 12 |
Journal | Acta Materialia |
Volume | 181 |
Early online date | 24 Sept 2019 |
DOIs | |
Publication status | Published - 31 Dec 2019 |
Keywords
- springback
- work hardening plateau
- in situ X-ray diriffraction
- EBSD