Adiabatic flow curves of metallic materials at high strain rates

El-Magd, Essam; Scholles, H.; Weisshaupt, H.

doi:10.1002/mawe.19960270814

Cited by 7 publications

(4 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The increase in ageing time from 30 to 3000 h at 850 "C led to a displacement of the minimum creep rate to higher creep strains and the minimum creep rate was higher for the longer ageing time. As also reported in [10], the rupture strain increased and the rupture time decreased with increasing ageing time. The effect of ageing at high temperatures on the relationship between minimum creep rate and the applied stress is shown in figure 4c.…”

Section: Resultssupporting

confidence: 83%

“…The precipitation processes occurring in solution treated 800H during thermal ageing are presented and described in [13; 14] using the one parameter set of constitutive equations. For 800HT the results of SEM examinations of the precipitation and precipitate growth processes are presented in [10] and the theoretical description of the creep behaviour using a model concept is given in [15].…”

Section: Materials Technologymentioning

confidence: 99%

“…The influence of thermal ageing on the creep rupture behaviour is presented in [5] for Alloy 800H and in [10] for Alloy 800HT. A model for the intercrystalline creep crack growth rate during creep at 800 and 900 DC has been described in [10; 11] for the solution treated 800HT material.…”

Section: Materials Technologymentioning

confidence: 99%

See 2 more Smart Citations

The influence of prior ageing on creep damage development in two variants of Alloy 800

et al. 1997

View full text Add to dashboard Cite

The influence of high temperature thermal ageing treatments on the development of intercrystalline creep damage in two variants of Alloy BOO has been investigated. Ageing up to 3000 h and creep testing were carried out at BOO and 900°C. The high temperature behaviour of the BOOHT variant is discussed with reference to the effect of heat treatments on the microstructure. The metallographic methods by which the creep damage was quantitatively determined are described. The growth rate of intercrystalline microcracks was described using a statistical model and the dependence of crack growth rate on the thermal history for both BOOHT and BOOH was determined. The carbide precipitation and growth processes were determined as functions of the exposure temperature and duration. The results showed the three characteristic stages, precipitation, growth and coarsening (Ostwald ripening). The largest increase in the intergranular creep damage was found in Alloy BOOHT within the first 1000 h, in which the precipitation of chromium carbides on the grain boundaries is substantially completed. The comparison between the two variants showed significant differences in the damage development. BOOHT exhibited at BOO and 900°C higher creep crack growth rates with increasing exposure duration, but in BOOH this effect was not clearly identified. EinfluB einer Langzeitigauslagerung auf die Kriechschadigungsentwlcklung zweier Varianten von Alloy 800. Am Beispiel zweier unterschiedlicher Varianten der Legierung Alloy BOO wird der EinfluB einer Hochtemperaturauslagerung bis zu 3000 Stunden auf die Entwicklung der interkristallinen Schadigung bei Versuchstemperaturen von BOO und 900°C untersucht. Das Hochtemperaturverhalten unter Zeitstandbedingung der neuen Legierungsvariante Alloy BOOHT wird, wie dessen Mikrostruktur, in Abhangigkeit von der Warmebehandlung diskutiert. Die metallographischen Methoden zur quantitativen Erfassung der Kriechschadigung mit einem Schadiqunqspararneter werden ertautert, Die Wachstumsgeschwindigkeit interkristalliner Mikrorisse wird mit Hilfe eines statistischen Modells beschrieben und ihre Abhangigkeit vom Auslagerungszustand fOr Alloy BOOHT und Alloy BOOH bestimmt. Carbidausscheidung und -wachstum wurden abhangig von Temperatur und Dauer untersucht. Die Ergebnisse zeigen das Durchlaufen der lypischen drei Bereiche Ausscheidung, Wachstum und Vergroberung (Ostwald-Reifung). Der groBte Zuwachs der interkristallinen Schadigung wurde in Alloy BOOHT innerhalb der ersten 1000 Stunden, wah rend die Ausscheidung von Chromcarbiden auf den Korngrenzen zum AbschluB kommt, gefunden. Der Vergleich zwischen den beiden Varianten der Legierung zeigt einen deutlichen Unterschied bei der Entwicklung der Kriechschadigung. BOOHT weist bei BOO und 900°C eine groBere Wachstumsgeschwindigkeit interkristalliner Kriechrisse mit zunehmender Versuchsdauer auf, als BOOH. Bei Alloy BOOH kann dieser Zusammenhang nicht klar nachgewiesen werden.

show abstract

Section: Resultssupporting

confidence: 83%

Section: Materials Technologymentioning

confidence: 99%

See 1 more Smart Citation

The influence of prior ageing on creep damage development in two variants of Alloy 800

et al. 1997

View full text Add to dashboard Cite

show abstract

“…On the other hand, the adiabatic character of the deformation process reduces the flow stress and promotes instability. Furthermore, the deformation process is influenced by inertia and mechanical wave propagation effects [39,40,41,42]. …”

Section: Mechanical Properties Of Mg-ca Alloysmentioning

confidence: 99%

Biodegradable Orthopedic Magnesium-Calcium (MgCa) Alloys, Processing, and Corrosion Performance

2012

View full text Add to dashboard Cite

Magnesium-Calcium (Mg-Ca) alloy has received considerable attention as an emerging biodegradable implant material in orthopedic fixation applications. The biodegradable Mg-Ca alloys avoid stress shielding and secondary surgery inherent with permanent metallic implant materials. They also provide sufficient mechanical strength in load carrying applications as opposed to biopolymers. However, the key issue facing a biodegradable Mg-Ca implant is the fast corrosion in the human body environment. The ability to adjust degradation rate of Mg-Ca alloys is critical for the successful development of biodegradable orthopedic implants. This paper focuses on the functions and requirements of bone implants and critical issues of current implant biomaterials. Microstructures and mechanical properties of Mg-Ca alloys, and the unique properties of novel magnesium-calcium implant materials have been reviewed. Various manufacturing techniques to process Mg-Ca based alloys have been analyzed regarding their impacts on implant performance. Corrosion performance of Mg-Ca alloys processed by different manufacturing techniques was compared. In addition, the societal and economical impacts of developing biodegradable orthopedic implants have been emphasized.

show abstract

Advances in Material Modeling for Manufacturing Analysis and Simulation (Deformation and Cutting Processes)

Ceretti

Giardini

Fiorentino

2019

Modern Manufacturing Processes

View full text Add to dashboard Cite

Adiabatic flow curves of metallic materials at high strain rates

Cited by 7 publications

References 13 publications

The influence of prior ageing on creep damage development in two variants of Alloy 800

The influence of prior ageing on creep damage development in two variants of Alloy 800

Biodegradable Orthopedic Magnesium-Calcium (MgCa) Alloys, Processing, and Corrosion Performance

Advances in Material Modeling for Manufacturing Analysis and Simulation (Deformation and Cutting Processes)

Contact Info

Product

Resources

About