5 Werkstofftechnik
Filtern
Dokumenttyp
- Vortrag (91)
- Zeitschriftenartikel (66)
- Beitrag zu einem Tagungsband (17)
- Posterpräsentation (17)
- Forschungsdatensatz (16)
- Buchkapitel (3)
- Corrigendum (1)
- Dissertation (1)
Sprache
- Englisch (212) (entfernen)
Schlagworte
- Ontology (26)
- Creep (25)
- Additive manufacturing (21)
- Microstructure (21)
- Additive Manufacturing (13)
- Fatigue (12)
- Degradation (11)
- Ti-6Al-4V (11)
- Coarsening (10)
- Aging (9)
Organisationseinheit der BAM
- 5.2 Metallische Hochtemperaturwerkstoffe (212) (entfernen)
Paper des Monats
- ja (1)
An improved diffusion model is proposed for pore annihilation during HIP of single-crystal nickel-base superalloys. The model assumes the pore dissolution by emission of vacancies and their sink to the low angle boundaries. Calculation, considering distribution of the pore sizes, predicts the kinetics of pore annihilation similar to the experimental one.
Temperature-induced, stress-induced martensitic phase transitions and martensite reorientation process in Ni rich (50.9 at.%) NiTi pseudoelastic NiTi wires with ultra-fine grained (UFG) microstructure were studied by electrical resistance measurements. Measurements of the electrical resistance as a function of temperature at different constant mechanical loads accompanied by complementary experiments with variable loads at constant temperature were performed. Results show that the transformation mechanisms in UFG microstructures exhibit a higher level of complexity when compared with those characterizing the behavior of other microstructures (e.g., recrystallized or larger grains size). It was found that a threshold stress level below 150 MPa delimits the transition from a homogeneous (low stress) to localized but reversible Lüders type transformation (high stress) when the transformations are induced under constant applied stress and that reorientation processes require stresses of 100 MPa in the present UFG wires. Even though the strain evolutions do not always show two distinct yielding events during cooling or heating, electrical resistance measurements proved that a two-step transformation involving R-phase and B19' martensite was always present in the extended range of temperatures and stresses investigated here.