Effect of silicon on the formation of intermetallic phases in aluminide coating on mild steel

Cheng, Wei-Jen; Wang, Chaur-Jeng

doi:10.1016/j.intermet.2011.05.013

Cited by 142 publications

(55 citation statements)

References 25 publications

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“…Coatings 2017, 7,222 beam (FIB), and their chemical composition and diffraction pattern were then obtained using the FEI (Hillsboro, OR, USA) TALOS F200X field-emission transmission electron microscopy (FE-TEM). The EDAX Hikari Electron backscatter diffraction (EBSD) was used to observe the phase distribution and crystal orientation of the reaction layer during formation and growth, and the Media Cybernetics (Rockville, MD, USA) Image-plus pro image analysis program was used for analyzing images to obtain parameters such as the thickness and length of each phase.…”

Section: Formation Of the Reaction Layer At Initial Hot Dippingmentioning

confidence: 99%

“…In order to overcome this challenge using Advanced High Strength Steel (AHSS), a hot stamping process has been developed that stabilizes both the formation and strength of boron steel [3][4][5]. However, in this process, scale formation and surface decarburization occur, caused by surface oxidation of the steel when heated in excess of 900 • C. In turn, to solve this issue, Al-Si hot-dipped coating is typically performed [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Identification of Intermetallic Compounds and Its Formation Mechanism in Boron Steel Hot-Dipped in Al-7 wt.% Mn Alloy

et al. 2017

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Abstract:In laser welding and hot stamping Al-Si-coated boron steel, there is a problem that the strength of the joint is lowered due to ferrite formation in the fusion zone. The purpose of this study is to develop an Al-7 wt.% Mn hot-dip coating in which Mn, an austenite stabilizing element, replaces the ferrite stabilizing element Si. The nucleation and formation mechanism of the reaction layer was studied in detail by varying the dipping time between 0 and 120 s at 773 • C. The microstructure and phase constitution of the reaction layer were investigated by various observational methods. Phase formation is discussed using a phase diagram calculated by Thermo-Calc TM . Under a 30 s hot-dipping process, no reaction occurred due to the formation of a Fe 3 O 4 layer on the steel surface. The Fe 3 O 4 layer decomposed by a reduction reaction with Al-Mn molten alloy, constituent elements of steel dissolved into a liquid, and the reaction-layer nucleus was formed toward the liquid phase. A coated layer consists of a solidified layer of Al and Al 6 Mn and a reactive layer formed beneath it. The reaction layer is formed mainly by inter-diffusion of Al and Fe in the solid state, which is arranged on the steel in the order of Al 11 Mn 4 → FeAl 3 (θ) → Fe 2 Al 5 (η) phases, and the Fe 3 AlC (κ) in several nm bands formed at the interface between the η-phase and steel.

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Section: Formation Of the Reaction Layer At Initial Hot Dippingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identification of Intermetallic Compounds and Its Formation Mechanism in Boron Steel Hot-Dipped in Al-7 wt.% Mn Alloy

et al. 2017

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“…On other hand, the inner intermetallic layer of DSS is (Fe,Cr) 2 Al 5 phase, rather than that of Fe 2 Al 5 . As reported previously, columnar‐like Fe 2 Al 5 intermetallic grains have the orthorhombic crystal structure that contained about 30% voids along the C‐axis, which makes Al diffuse much more easily into the inter‐diffusion front . This is why the interface between the Fe 2 Al 5 and H13 substrate has a serrated, or tongue morphology (Fig.…”

Section: Discussionmentioning

confidence: 99%

Interfacial reactions of duplex stainless steels with molten aluminum

Zhang

Chen

2015

Surf. Interface Anal.

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The morphology and constitution of the intermetallic layers formed on the surface of duplex stainless steels (DSSs) immersed in molten aluminum at 750 °C for 30 min have been studied in detail by scanning electron microscopy and electron probe micro‐analyzer. Compared with H13 steel, the DSSs exhibited a better corrosion resistance. The weight loss rates, as expressed in terms of weight loss per square centimeter of the specimen per minute, of DSSs are smaller than that of H13. The thickness of the intermetallic layers of DSSs is comparatively thinner. And the interface between the intermetallic layers and DSSs substrate is much flatter. The intermetallic layers of duplex stainless steels are consisted of inner continuous (Fe,Cr)2Al5 phase and outer porous (Fe,Cr)Al3 phases. Microstructure observations suggest that the retarded interfacial reaction between DSSs and molten aluminum is associated with a continuous Al‐Fe‐Cr intermetallic phases layer formed on the solid/liquid interface, which acts as an effective diffusion barrier. The precipitation phase particles distributed along the austenite/ferrite and ferrite/ferrite interfaces also had a good effect on the corrosion resistance properties of DSSs to molten aluminum. Copyright © 2015 John Wiley & Sons, Ltd.

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“…In the case of Al-Si alloys, the silicon in the aluminium baths being incorporated into the intermetallic layer has the ability to restrain the growth of intermetallic layer by occupying the vacancies in the c axis of the crystal structure of Fe 2 Al 5 . 8 Hence, with increasing Si content in hot dipping aluminium bath, the total thickness of the intermetallic layer decreases. The intermetallic phase is essentially hard and brittle.…”

Section: Mechanism Analysismentioning

confidence: 99%

Effect of Si content in hot dipping aluminium bath on Al–Fe bonding layer of aluminium piston with reinforced cast iron ring

Xiong

Sun

et al. 2012

Materials Science and Technology

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Pistons with reinforced cast iron ring are produced to meet the increasing performance requirement of internal combustion engines with high power. The intermetallic bonding between piston alloys and cast iron ring must be able to withstand the high pressure and high temperature environment of internal combustion engines. Consequently, the quality and strength of the intermetallic bonding are very important in piston manufacturing. In the present work, the effects of Si content variation in the hot dipping aluminium bath on interface reaction and the intermetallic bonding strength between the cast iron ring and the piston alloys are investigated. The results indicate that bonding strength increases with the increase in Si in the hot dipping aluminium bath to eutectic composition and decreases with excess Si. The mechanism for the variation of bonding strength is also discussed.

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Effect of silicon on the formation of intermetallic phases in aluminide coating on mild steel

Cited by 142 publications

References 25 publications

Identification of Intermetallic Compounds and Its Formation Mechanism in Boron Steel Hot-Dipped in Al-7 wt.% Mn Alloy

Identification of Intermetallic Compounds and Its Formation Mechanism in Boron Steel Hot-Dipped in Al-7 wt.% Mn Alloy

Interfacial reactions of duplex stainless steels with molten aluminum

Effect of Si content in hot dipping aluminium bath on Al–Fe bonding layer of aluminium piston with reinforced cast iron ring

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