Dependence of the brittle-to-ductile transition temperature (BDTT) on the Al content of Fe–Al alloys

Risanti, Doty Dewi; Deges, Johannes; Falat, Ladislav; Kobayashi, Satoru; Konrad, Joachim; Palm, Martin; Pöter, Birgit; Schneider, A.; Stallybrass, C. O.; Stein, Frank

doi:10.1016/j.intermet.2005.02.007

Cited by 61 publications

(45 citation statements)

References 30 publications

(39 reference statements)

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“…In the case of binary Fe-Al, where the BDT was observed at much lower temperatures than for the series of ternary alloys shown here, a qualitatively very similar dependence on the Al content was found [58]. The BDT temperatures only weakly increase at low Al contents but show a sudden increase between 40 and 45at.% Al.…”

Section: Brittle-to-ductile Transition (Bdt)supporting

confidence: 81%

Mechanical properties and oxidation behaviour of two-phase iron aluminium alloys with Zr(Fe,Al)2 Laves phase or Zr(Fe,Al)12 τ1 phase

2005

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Section: Brittle-to-ductile Transition (Bdt)supporting

confidence: 81%

Mechanical properties and oxidation behaviour of two-phase iron aluminium alloys with Zr(Fe,Al)2 Laves phase or Zr(Fe,Al)12 τ1 phase

2005

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“…Beside the cleavage and intergranular fracture, flat dimples are formed close to the coarse Laves phase. It is noted that a comparable binary Fe-25Al alloy without any ternary additions shows a much lower BDTT of the order of only 100 8C [31].…”

Section: Fe-25al Alloysmentioning

confidence: 99%

“…7(a)) increases with increasing Ta content, i.e. increasing amount of precipitate, corresponding to a rule of mixtures, where the binary alloy data was taken from [31]. However, it has to be noted that the precipitate particles of alloy 45-2 have been too small for identification through EPMA analysis as Laves phase or m 0 phase.…”

Section: Fe-45al Alloysmentioning

confidence: 99%

“…7(b)) are above 750 8C including the binary alloy [31] without Ta. Contrary to the other series, the BDTT in this series is not affected by the grain size as is indicated by the binary alloy with the large grain size [31]. Apparently the BDTT is more affected by the amount of precipitate in the present case.…”

Section: Fe-45al Alloysmentioning

confidence: 99%

“…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%

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

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Influence of Cu Addition and Microstructural Configuration on the Creep Resistance and Mechanical Properties of an Fe‐Based α/α′/α″ Superalloy

et al. 2023

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Decades of persistent efforts of the materials community aimed at developing a Fe-base alloy with creep resistance up to the range of 700-800 °C , due to the inherent cost advantage over Ni-base superalloys, have recently resulted in the development of hierarchical α/α 0 /α 00 (A2/B2/L2 1 -Heusler) ferritic superalloys. [1,2] These precipitate-strengthened materials based on the Fe-Al-Ni-Ti system are aimed for applications like reactors, pipelines, or heat exchangers in steam power plants. [3] They present a body-centered cubic (bcc) derived microstructure that emulates the facecentered cubic (fcc) derived microstructure of Ni-based superalloys, but in this case, based on the bcc crystal lattice. Due to the presence of α 00 within α 0 , these alloys are also referred to as "hierarchical precipitatestrengthened." This microstructure aims to obtain a balance of creep resistance and reasonable ductility resulting from coherently embedded high-strength α 0 /α 00 precipitates in a ductile α-Fe disordered matrix. In this alloy system, the coherency between the matrix and parent precipitates is retained longer due to the adjustment of the misfit strain by the multiple interfaces present in their hierarchical precipitates, which are based on the NiAl (B2)/Ni 2 AlTi(L2 1 ) intermetallic phases. [4] This approach already showed outstanding results, and Song et al. [2] reported an increase in creep resistance of around four orders of magnitude for the so-called hierarchical precipitate-strengthened ferritic alloy (HPSFA) compared to its predecessor, an α/α 0 (A2/B2) alloy, fulfilling the requirements for its use in ultra-supercritical (USC) steam turbines of at least 100 000 h for rupture at 760 °C and 35 MPa.Continuing with the research on this emerging material class through our previous alloy development effort in the Fe-Al-(Ni, Co)-Ti system, [5] we proposed the possible synergic addition of Co and Cu to this type of materials, which resulted in two hierarchical ferritic alloys, FSA1 and FSA2 with nominal compositions presented in Table 1. In these alloys, Co and Cu partition to the α 0 /α 00 precipitates [5] and are expected to act as strengthening elements. Co was incorporated to increase the creep resistance, [6][7][8] while Cu was added to FSA2, to increase the stability of α 00 (L2 1 ) [9,10]

show abstract

Dependence of the brittle-to-ductile transition temperature (BDTT) on the Al content of Fe–Al alloys

Cited by 61 publications

References 30 publications

Mechanical properties and oxidation behaviour of two-phase iron aluminium alloys with Zr(Fe,Al)2 Laves phase or Zr(Fe,Al)12 τ1 phase

Mechanical properties and oxidation behaviour of two-phase iron aluminium alloys with Zr(Fe,Al)2 Laves phase or Zr(Fe,Al)12 τ1 phase

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

Influence of Cu Addition and Microstructural Configuration on the Creep Resistance and Mechanical Properties of an Fe‐Based α/α′/α″ Superalloy

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