Effects of deviations from stoichiometry on the deformation behaviour of FeAl at intermediate temperatures

Reimann, Uwe; Sauthoff, Gerhard

doi:10.1016/s0966-9795(98)00104-6

Cited by 21 publications

(13 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[1,2] Addition of B is shown to be beneficial in strengthening the gain boundaries of Fe- (35)(36)(37)(38)(39)(40) at. pct Al and in increasing the resistance to intergranular fracture.…”

Section: Room-temperature Tensile Behaviormentioning

confidence: 99%

“…[1] These vacancies are mobile at high temperatures, significantly enhance diffusion kinetics, and are expected to lower elevated temperature strength and creep resistance. Recently, Reimann and Sauthoff [40] reported that the crossover from lowtemperature to high-temperature deformation behavior occurs at about 1000°C for 10 Ϫ3 s Ϫ1 and at lower temperatures for lower strain rates. Our tensile and creep results agree well with the results of Reimann and Sauthoff.…”

Section: Creep Propertiesmentioning

confidence: 99%

“…As discussed earlier, we observed that retained vacancies increase strength even at 800°C and enhance creep resistance even at 700°C (Ϸ0.6 T m ). Reimann and Sauthoff [40] noted that the transition from low-temperature to high-temperature deformation behavior occurs at higher homologous temperature in FeAl than NiAl. Hence, the vacancies can be used to enhance the mechanical properties of FeAl over a wider temperature range.…”

Section: Creep Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Effect of carbon addition on the strength and creep resistance of FeAl alloys

Sundar¹,

Deevi²

2003

Metall Mater Trans A

View full text Add to dashboard Cite

We investigated the effect of carbon content (0.05, 0.12, and 0.2 wt pct C) and heat-treatment temperature (1100°C and 1300°C for 2 hours and air cooled) on the tensile and the creep properties of Fe-24 wt pct Al alloy. The increase of carbon content increased the yield strength without affecting the tensile ductility of the alloys. Carbon content appears to be beneficial in suppressing the hydrogen embrittlement at the grain boundary, because the fracture mode changes from predominantly intergranular failure in a low carbon (0.05 wt pct C) alloy to a predominantly transgranular cleavage failure in a high carbon (0.2 wt pct C) alloy. With the increase of carbon content, the anomalous yield strength peak shifted to a higher temperature possibly due to the interaction between carbon and vacancies. Significant improvements were noted in the tensile and the creep properties of medium (0.12 wt pct C) and high carbon (0.2 wt pct C) alloys after heat treating at 1300°C. The improvements in the tensile and the creep properties were attributed to the synergetic effect of retained vacancies and fine carbide precipitates present in the alloys after 1300°C heat treatment. However, the improved strength and creep properties associated with 1300°C heat treatment were lost when the heat-treated alloys were further subjected to a vacancy removal annealing. Our results suggest that the retained vacancies present in the FeAl alloys after high-temperature heat treatment and air cooling are effective in improving the creep resistance at 700°C, and yield strength up to 800°C. The creep resistance of the present high carbon FeAl alloy is comparable to or better than several grades commercial heat-resistant Fe-based and Ni-based alloys.

show abstract

“…[1,2] Addition of B is shown to be beneficial in strengthening the gain boundaries of Fe- (35)(36)(37)(38)(39)(40) at. pct Al and in increasing the resistance to intergranular fracture.…”

Section: Room-temperature Tensile Behaviormentioning

confidence: 99%

Section: Creep Propertiesmentioning

confidence: 99%

Section: Creep Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Effect of carbon addition on the strength and creep resistance of FeAl alloys

Sundar¹,

Deevi²

2003

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…7. Yield stress of as-cast Fe-45Al alloys in comparison to data for a binary Fe-45Al alloy without Ta [32] (a) and flexural fracture strain of ascast Fe-45Al alloys in comparison to data for a binary Fe-45Al alloy without Ta [31] (the arrows indicate fracture strains above 3%) (b) as a function of temperature. occurs obviously above 600 8C.…”

Section: Oxidationmentioning

confidence: 99%

Strengthening of iron aluminide alloys by atomic ordering and Laves phase precipitation for high-temperature applications

Risanti

Sauthoff

2005

Intermetallics

Self Cite

View full text Add to dashboard Cite

“…the structural defects originating from deviations from stoichiometry [27]. The effects of thermal vacancies are recognized in the vacancy hardening model of George and Baker [1], already mentioned in the Introduction, and in other related papers [28,29].…”

Section: Temperature Range Of the Flow Stress Anomalymentioning

confidence: 95%