Isothermal Sections in the (Fe, Ni)-Rich Part of the Fe-Ni-Al Phase Diagram

Chumak, Ihor; Richter, Klaus W.; Ipser, Herbert

doi:10.1007/s11669-008-9319-7

Cited by 24 publications

(11 citation statements)

References 7 publications

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“…Nickel is one of the most effective alloying element for forming B2 with aluminium [40]. A recent study showed that nickel can expand the stability domain of B2 above the recrystallization temperature (800-900 • C) of deformed austenite and improve the mechanical properties of lightweight steels [41].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ni alloying on the microstructural evolution and mechanical properties of two duplex light-weight steels during different annealing temperatures: Experiment and phase-field simulation

2017

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Section: Introductionmentioning

confidence: 99%

Effect of Ni alloying on the microstructural evolution and mechanical properties of two duplex light-weight steels during different annealing temperatures: Experiment and phase-field simulation

2017

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“…In this study, potential nucleation sites for B2 during annealing of wrought sheet steel include (1) grain boundaries or edges of recrystallized austenite crystals and (2) deformation shear bands, which are common in hot-or cold-worked low-density steel 3,5,7,16,17 . To expand the stability domain of B2 above the recrystallization temperature (normally, 800-900 uC) of deformed austenite, the alloying recipe of an austenitic low-density steel was modified by adding 5 weight per cent nickel (Ni), which is one of the most effective elements for forming B2 with aluminium 18,19 . The addition of Ni to lowdensity steel may appear to conflict with the collective wisdom of ferrous alloy design; Ni has been regarded merely as a well-known austenite stabilizer like Mn and C; and Ni has been little noticed in low-density steel design, mainly because it is not a critical determinant of the density in ferrous alloys.…”

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confidence: 99%

Brittle intermetallic compound makes ultrastrong low-density steel with large ductility

Kim

2015

Nature

596

269

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Although steel has been the workhorse of the automotive industry since the 1920s, the share by weight of steel and iron in an average light vehicle is now gradually decreasing, from 68.1 per cent in 1995 to 60.1 per cent in 2011 (refs 1, 2). This has been driven by the low strength-to-weight ratio (specific strength) of iron and steel, and the desire to improve such mechanical properties with other materials. Recently, high-aluminium low-density steels have been actively studied as a means of increasing the specific strength of an alloy by reducing its density. But with increasing aluminium content a problem is encountered: brittle intermetallic compounds can form in the resulting alloys, leading to poor ductility. Here we show that an FeAl-type brittle but hard intermetallic compound (B2) can be effectively used as a strengthening second phase in high-aluminium low-density steel, while alleviating its harmful effect on ductility by controlling its morphology and dispersion. The specific tensile strength and ductility of the developed steel improve on those of the lightest and strongest metallic materials known, titanium alloys. We found that alloying of nickel catalyses the precipitation of nanometre-sized B2 particles in the face-centred cubic matrix of high-aluminium low-density steel during heat treatment of cold-rolled sheet steel. Our results demonstrate how intermetallic compounds can be harnessed in the alloy design of lightweight steels for structural applications and others.

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“…The same authors carried out a thermodynamic analysis of the system which covered the entire composition range and a wide temperature range, from 850 C to 1250 C [30]. Recently, Chumak et al [31] investigated the phase diagram in the region below 50 at.% Al. This work determined several partial isothermal sections from 900 C to 1200 C and the ternary phase equilibria.…”

Section: Feeniealmentioning

confidence: 99%

“…The solubilities of the third element in the FeeAl and NieAl binary phases are taken from Eleno et al [16]. The solubility of Ni in Fe 4 Al 13 given in Eleno et al [16] is 7 at.%, while a value of 11 at.% was reported in Chumak et al [31].…”

Section: Feeniealmentioning

confidence: 99%