Progress toward attaining theoretical strength with iron-nickel maraging steels

Mihalisin, J. R.; Bieber, C.

doi:10.1007/bf03378496

Cited by 12 publications

(5 citation statements)

References 3 publications

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“…[9,10,11] Their formation typically results in degradation of mechanical properties through depletion of strengthening additions and/or by providing fracture initiation sites. However, with increasing levels of refractory element additions, phase stability in these single-crystal alloys becomes a concern due to lack of knowledge regarding solubility limits and precipitation kinetics.…”

Section: Introductionmentioning

confidence: 99%

Discontinuous cellular precipitation in a high-refractory nickel-base superalloy

Nyström

Pollock

Murphy

et al. 1997

Metall Mater Trans A

117

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A discontinuous precipitation reaction has been investigated in a high-refractory content nickel-base alloy. The reaction transforms the two-phase ␥-␥ ' parent microstructure into a three-phase cellular structure with a ␥' matrix containing Re-rich P-phase and agglomerated ␥ lamellae. The reaction has been studied in polycrystalline material and in bicrystals with varying degrees of boundary misorientation at temperatures in the range of T/T m ϭ 0.78 to 0.85. The early stages of the reaction are characterized by heterogeneous nucleation of P-phase precipitates and migration of the grain boundary. At low-angle, near-tilt boundaries misoriented by less than 10 deg, nucleation of P-phase particles was observed, but the cellular reaction did not occur, due to limited boundary mobility and diffusivity. The high degree of supersaturation of Re and W in the initial ␥-␥' alloy appears to be the primary driving force for the reaction. Small amounts of creep deformation did not significantly influence the extent of the transformation. The diffusivity of Re associated with the moving boundary was calculated to be 5 ϫ 10 Ϫ8 cm 2 s Ϫ1 at 1093 ЊC, which is approximately four orders of magnitude greater than the bulk lattice diffusivity of tungsten.

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Section: Introductionmentioning

confidence: 99%

Discontinuous cellular precipitation in a high-refractory nickel-base superalloy

Nyström

Pollock

Murphy

et al. 1997

Metall Mater Trans A

117

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show abstract

“…26,27 This figure also contains the plots for iron base metallic glasses 28 and SPD-processed ͑SPDed͒ pure metals with fine grain structures. 29,30 The precipitation hardened Fe-Mo base laboratory alloys have the highest strength among the bulk iron base alloys ever reported, 24,25 and they have very high value of UTS/E but with poor ductility. Iron base metallic glasses have similar properties to the Fe-Mo alloys, however they are very brittle like other glasses.…”

mentioning

confidence: 98%

“…The microdimples confirm that this specimen failed after substantial amount of local plastic deformation accompanied by ductile process of microvoid evolution and coalescence. Figure 3͑c͒ presents the relationship between UTS/E value and elongation for high strength iron base alloys including lab-based special alloys 24,25 and thin steel wires. 26,27 This figure also contains the plots for iron base metallic glasses 28 and SPD-processed ͑SPDed͒ pure metals with fine grain structures.…”

mentioning

confidence: 99%

Lattice softening for producing ultrahigh strength of iron base nanocrystalline alloy

Kuramoto

Furuta

Nagasako

et al. 2009

Applied Physics Letters

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“…These combinations of UTS and total elongation are far better than those in conventional high-strength steels ever reported. The precipitation hardened FeMo base laboratory alloys 17,18) have very high UTS of around 3.6 GPa but poor ductility below 1% of tensile elongation. Some of the cold drawn thin wires 19,20) have the better combination of strength and ductility than the FeMo alloys but their ductility is only 3% of elongation.…”

Section: Comparison In Mechanical Properties Of Spded Fementioning

confidence: 99%

Severe Plastic Deformation to Achieve High Strength and High Ductility in Fe–Ni Based Alloys with Lattice Softening

Kuramoto

Furuta

2019

Mater. Trans.

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In the present article, recent reports on microstructure and mechanical properties in SPDed FeNiCoTi and FeNiAlC alloys are overviewed. The chemical compositions in these alloys have been determined to have lattice softening where the elastic constant C A goes to a very small value. The alloys with lattice softening were processed with severe plastic deformation, SPD, to raise the strength. Here, SPD includes severe cold working by rotary swaging, cold rolling and high-pressure torsion. These alloys have been reported to have ultrahigh strength along with good tensile ductility and the balance of strength and ductility is better than that in conventional high-strength steels. Microstructural development during the SPD process and the relation between microstructure and mechanical properties in SPDed alloys are summarized. The phase stability of £ has an important role in the microstructural development during SPD process and deformation behavior in the subsequent mechanical testing. The untransformed £ has a potent capability for plastic deformation where strain-induced transformation and deformation twinning can be expected to occur during mechanical tests after SPD processing. Simultaneous activation of these deformation mechanisms during plastic deformation would be a common feature in the lattice softened alloys, but the effects of alloying elements and phase stability on the deformation behavior have not been understood yet.

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Progress toward attaining theoretical strength with iron-nickel maraging steels

Cited by 12 publications

References 3 publications

Discontinuous cellular precipitation in a high-refractory nickel-base superalloy

Discontinuous cellular precipitation in a high-refractory nickel-base superalloy

Lattice softening for producing ultrahigh strength of iron base nanocrystalline alloy

Severe Plastic Deformation to Achieve High Strength and High Ductility in Fe–Ni Based Alloys with Lattice Softening

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