Hot deformation behavior of a Fe3Al-binary alloy in the A2 and B2-order regimes

Konrad, Joachim; Zaefferer, Stefan; Schneider, A.; Raabe, Dierk; Frommeyer, G.

doi:10.1016/j.intermet.2004.10.017

Cited by 27 publications

(13 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[39][40][41] By correlating Form and Baldwin's observations and RT tensile properties of the disordered phase, it is suggested that SIM formed in 304 SS would correspond to the disordered phase which would also be induced in 310 SS by the passage of dislocations during tensile tests at RT. [42][43][44] Disordered phase formation arising from the destruction of the ordered phase by moving dislocations is termed strain-induced disordering (SID), [45] and the disordered phase is formed predominantly by plastic deformation in metals at low temperatures where the rate of disordering exceeds the rate of strain-induced ordering (SIO), [46] i.e., the rate of ordering. Hence, a linear increase in the ductility and strain hardening of 304 SS with increasing amount of SIM despite a hard phase, as shown in Figure 5, suggests that SIM corresponds to the disordered phase.…”

Section: The Nature Of Strain-induced Martensite (Sim)mentioning

confidence: 99%

Effect of Strain-Induced Martensite on Tensile Properties and Hydrogen Embrittlement of 304 Stainless Steel

Kim

Bak

Kim

2015

Metall Mater Trans A

View full text Add to dashboard Cite

Room temperature tensile tests have been conducted at different strain rates ranging from 2 9 10 À6 to 1 9 10 À2 /s on hydrogen-free and hydrogen-charged 304 stainless steel (SS). Using a ferritescope and neutron diffraction, the amount of strain-induced martensite (SIM) has been in situ measured at the center region of the gage section of the tensile specimens or ex situ measured on the fractured tensile specimens. The ductility, tensile stress, hardness, and the amount of SIM increase with decreasing strain rate in hydrogen-free 304 SS and decrease in hydrogen-charged one. Specifically, SIM that forms during tensile tests is beneficial in increasing the ductility, strain hardening, and tensile stress of 304 SS, irrespective of the presence of hydrogen. A correlation of the tensile properties of hydrogen-free and hydrogen-charged 304 SS and the amount of SIM shows that hydrogen suppresses the formation of SIM in hydrogen-charged 304 SS, leading to a ductility loss and localized brittle fracture. Consequently, we demonstrate that hydrogen embrittlement of 304 SS is related to hydrogen-suppressed formation of SIM, corresponding to the disordered phase, according to our proposition. Compelling evidence is provided by the observations of the increased lattice expansion of martensite with decreasing strain rate in hydrogen-free 304 SS and its lattice contraction in hydrogen-charged one.

show abstract

Section: The Nature Of Strain-induced Martensite (Sim)mentioning

confidence: 99%

Effect of Strain-Induced Martensite on Tensile Properties and Hydrogen Embrittlement of 304 Stainless Steel

Kim

Bak

Kim

2015

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…Basic parameters for hot-rolling of a Fe-26Al alloy were determined at MPIE by means of the hot deformation simulator (WUMSI) [145,146]. The obtained process parameters were then employed for hot-rolling in the disordered (A2) as well as in the B2-ordered regime and the resulting differences in the microstructures were carefully analysed which led to the optimisation of the thermo-mechanical treatment.…”

Section: Rolling/thermo-mechanical Treatmentmentioning

confidence: 99%

Fe–Al materials for structural applications at high temperatures: Current research at MPIE

Palm

2009

International Journal of Materials Research

View full text Add to dashboard Cite

Fe-Al materials for structural applications at high temperatures: Current research at MPIEFe -Al-based materials possess a number of properties which make them highly interesting for the development of new light-weight structural materials. However, lack of strength at high temperatures and limited ductility at ambient temperatures so far has hindered any wider application of these materials. Recent progress achieved within an inter-departmental research initiative at the Max-Planck-Institut für Eisenforschung GmbH is reviewed here. Based on a sound knowledge of physical and thermodynamic properties and careful analysis of the phase equilibria, various alloy systems have been investigated which offer different mechanisms for strengthening Fe -Al-based materials at high temperatures. By applying these mechanisms Fe -Al-based alloys with sufficient strength for structural applications at least between 650 -800 8C have been developed. For these alloys processing routes such as rolling and forging have been demonstrated. Low ductility is still a crucial issue, but measures exist for improving ductility, e. g. by refining the microstructure through thermo-mechanical treatment. It has also been shown that iron aluminides not only show superior corrosion resistance in oxidising and sulphidising atmospheres but also in other hostile environments like carburising atmospheres and under molten salts.

show abstract

“…2b seems not to show any flow curve at a strain rate higher than 10 s À1 . Such oscillations generally suggest that dynamic recrystallization (DRX) may be occurring [9]. However, it is hard to attribute any specific deformation mechanism to the shapes of flow curves since different mechanisms lead to a similar behavior, e.g., DRX or flow instability.…”

Section: Resultsmentioning

confidence: 99%