Details
| Original language | English |
|---|---|
| Pages (from-to) | 127-141 |
| Number of pages | 15 |
| Journal | ASTM Special Technical Publication |
| Issue number | 1428 |
| Publication status | Published - 2003 |
| Externally published | Yes |
| Event | hermomechanical Fatigue Behavior of Materials: 4th Volume - Dallas, TX, United States Duration: 7 Nov 2001 → 8 Nov 2001 |
Abstract
High-temperature fatigue behavior of a near-γ titanium aluminide was studied over the temperature range from 500-750°C under both isothermal and thermomechanical fatigue (TMF) conditions. Cyclic stress-strain (CSS) response was observed to change drastically with test temperature. In isothermal tests conducted below the ductile-to-brittle transition temperature (DBTT) initial cyclic hardening occurred. By contrast, in isothermal fatigue tests performed above the DBTT the material displayed pronounced cyclic saturation throughout the test. Still, modeling of CSS behavior under TMF conditions based solely on isothermal input data is feasible, as corresponding microstructures evolve in both types of tests. Environmental degradation plays a key role in this material, and the effects were assessed based on fatigue tests conducted in air and high-vacuum, respectively. Moreover, the material displays large mean stress effects below the DBTT, and thus, out-of-phase TMF tests were found to be most detrimental, when the temperature range encompassed the DBTT.
Keywords
- Cyclic stress-strain behavior, Environmental degradation, Intermetallics, Mean stress, Microstructure, Modeling, Oxidation, Thermomechanical fatigue, Titanium aluminide
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
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In: ASTM Special Technical Publication, No. 1428, 2003, p. 127-141.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Environmental effects on the isothermal and thermomechanical fatigue behavior of a near-γ titanium aluminide
AU - Maier, Hans J.
AU - Fischer, Frank O.R.
AU - Christ, Hans Jürgen
PY - 2003
Y1 - 2003
N2 - High-temperature fatigue behavior of a near-γ titanium aluminide was studied over the temperature range from 500-750°C under both isothermal and thermomechanical fatigue (TMF) conditions. Cyclic stress-strain (CSS) response was observed to change drastically with test temperature. In isothermal tests conducted below the ductile-to-brittle transition temperature (DBTT) initial cyclic hardening occurred. By contrast, in isothermal fatigue tests performed above the DBTT the material displayed pronounced cyclic saturation throughout the test. Still, modeling of CSS behavior under TMF conditions based solely on isothermal input data is feasible, as corresponding microstructures evolve in both types of tests. Environmental degradation plays a key role in this material, and the effects were assessed based on fatigue tests conducted in air and high-vacuum, respectively. Moreover, the material displays large mean stress effects below the DBTT, and thus, out-of-phase TMF tests were found to be most detrimental, when the temperature range encompassed the DBTT.
AB - High-temperature fatigue behavior of a near-γ titanium aluminide was studied over the temperature range from 500-750°C under both isothermal and thermomechanical fatigue (TMF) conditions. Cyclic stress-strain (CSS) response was observed to change drastically with test temperature. In isothermal tests conducted below the ductile-to-brittle transition temperature (DBTT) initial cyclic hardening occurred. By contrast, in isothermal fatigue tests performed above the DBTT the material displayed pronounced cyclic saturation throughout the test. Still, modeling of CSS behavior under TMF conditions based solely on isothermal input data is feasible, as corresponding microstructures evolve in both types of tests. Environmental degradation plays a key role in this material, and the effects were assessed based on fatigue tests conducted in air and high-vacuum, respectively. Moreover, the material displays large mean stress effects below the DBTT, and thus, out-of-phase TMF tests were found to be most detrimental, when the temperature range encompassed the DBTT.
KW - Cyclic stress-strain behavior
KW - Environmental degradation
KW - Intermetallics
KW - Mean stress
KW - Microstructure
KW - Modeling
KW - Oxidation
KW - Thermomechanical fatigue
KW - Titanium aluminide
UR - http://www.scopus.com/inward/record.url?scp=8844244785&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:8844244785
SP - 127
EP - 141
JO - ASTM Special Technical Publication
JF - ASTM Special Technical Publication
SN - 0066-0558
IS - 1428
T2 - hermomechanical Fatigue Behavior of Materials: 4th Volume
Y2 - 7 November 2001 through 8 November 2001
ER -