Structural transformation in mechanosynthesized bcc Fe–Al–Si(Ge) solid solutions during heating

Кубалова, Л. М.; Sviridov, I. A.; Vasilyeva, O.Ya.; Fadeeva, V.I.

doi:10.1016/j.jallcom.2006.08.107

Cited by 13 publications

(4 citation statements)

References 11 publications

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“…1(e) and (f)). This intermetallic phase is very likely the same as the one reported previously by Kubalova et al, 19) who reported it as the FeAl 1Ϫx Si x phase containing 25 at% Si.…”

Section: Discussionsupporting

confidence: 85%

Coating Degradation in Hot Press Forming

Fan

Kim

et al. 2010

ISIJ Int.

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The thermo-mechanically induced microstructure changes occurring in a type 1 aluminized coating on hot press forming (HPF) steel were studied in detail. The formation of intermetallic phases at the soaking temperature prior to die quenching revealed that the coating matrix consists mainly of FeAl 2 intermetallic phase by the time the press forming carried out. Kirkendall void formation was observed to take place. The thermal oxidation of aluminized coating during HPF was found to be limited, with the coating acting as an effective barrier for the oxygen during heating. The deterioration caused by the high temperature plastic deformation was shown to lead to coating cracking without loss of adhesion. The steel surface was oxidized where it was exposed between the coating segments.KEY WORDS: hot press forming; aluminized; intermetallic; diffusion; Kirkendall voids. 561© 2010 ISIJ steels are coated with a 25 mm thick Al-10wt%Si type 1 coating. Type 2 coating consists of pure aluminum, and is used mainly for high reflectivity surface appearance, such as building cladding panels and ventilation systems. The typical thickness of type 2 coating is 38-60 mm. 9) ExperimentalThe material used in the present study was cold rolled and continuous hot dipped Al-10wt%Si aluminized steel sheet of 1.6 mm thickness supplied by the POSCO Technical Research Laboratories. The steel chemical composition is given in Table 1. The steel is a CMn steel with additions mainly of Cr and B. Carbon, an austenite stabilizer, is the most effective strengthening elements for martensite via the mechanism of interstitial solute strengthening. Weldability requirements limit the carbon equivalent to a maximum of about 0.5. A carbon content of 0.2 wt% C ensures the decomposition of austenite into a high strength lath martensite microstructure when relatively low cooling rates are used, providing B-additions are made. Mn is an effective hardening addition as it retards most austenite decomposition reactions. Cr is another strong hardenability agent, which effectively suppresses the bainite transformation. B is added to HPF steels to increase the hardenability by etarding the heterogeneous nucleation of ferrite at the austenite grain boundaries. Additions of Al and Ti are often used to avoid the formation of BN. AlN or TiN precipitates are formed as instead. TiN also suppresses grain growth. 10,11) Rectangular specimens with dimension of 40ϫ150 mm were cut. Their weight was approximately 100 g. The specimens had large enough surfaces to minimize the effect of the increased weight caused by the oxidation of the cut edges during high temperature tests. The specimens were transferred to a box furnace with a stationary air atmosphere and kept at 930°C for 2-120 min. The specimens were then removed from the furnace and cooled in air to room temperature. The specimens were weighted before and after the heat treatment. The specimens were grinded and polished with a 1 mm diamond suspension. The cross sectional specimens were not etched in order to avoid the me...

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“…1(e) and (f)). This intermetallic phase is very likely the same as the one reported previously by Kubalova et al, 19) who reported it as the FeAl 1Ϫx Si x phase containing 25 at% Si.…”

Section: Discussionsupporting

confidence: 85%

Coating Degradation in Hot Press Forming

Fan

Kim

et al. 2010

ISIJ Int.

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“…The singlet is generally attributed to paramagnetic domains with symmetrical surrounding of Fe by non-ferromagnetic atoms of Si and/or Al, that is domains of the B2 ordered phase [38][39][40][41]; however, in the present study, no ordered phase was observed in XRD spectra which showed only the formation of the disordered (bcc) solid solution (see section 3.2). Hence, this single phase corresponds to paramagnetic disordered Fe54Al36Si10 solid solution.…”

Section: Mössbauer Analysiscontrasting

confidence: 67%

Structure, Microsctructure and Magnetic Properties of Ternary (Fe0.6Al0.4)100-xSix Nanostructured Powders: Effect of Si Addition

Boukherroub

Hemmous²,

Guittoum

et al. 2019

JNanoR

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Nanostructured (Fe0.6Al0.4)100-xSix powders with x= 0, 5, 10, 15 and 20 at.% were elaborated by means of mechanical alloying for a fixed milling time of 72 h. We have investigated the effect of silicon addition on the microstructure and magnetic properties of these ternary alloys. X-ray diffraction experiments reveal that these powders are single-phase disordered solid solutions with body centered cubic crystal structure. The lattice parameter diminishesalmost linearly as the Si content increases. The mean crystallite size,<D(nm)>, is around three times smaller for the samples with higher amount of Si (≈ 10 nm) compared with that of the binary alloy (27 nm). Moreover, the volume fraction of grain boundaries (fgb) seems to be higher with increasing the Si content, as well as both dislocation density (ρ) and lattice microstrain (<ε>),that follow alinear trend. The SEM images show that the Si helps in refining the shape and size of the powder particles, leading to a nearly homogeneous small particles.The addition of Si strongly affects the value of the saturation magnetization, Ms, that falls nearly an order of magnitude for the sample with 20 at.% Si, while the coercivity remains almost unchanged. The Mössbauer spectra show the presence of a sextet (ferromagnetic phase) and a singlet or a doublet (non ferromagnetic phase), except for the sample corresponding to x = 10, where only one singlet is observed in the spectrum.

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“…They also looked into the mechanism of crystallization, and microwave absorption [4][5][6]. FeSiAl powders made by mechanical alloying technique were also widely studied [7,8]. In the field of melt-quenching, a productive fabrication technique, only a few literatures, such as Ref.…”

Section: Introductionmentioning

confidence: 99%