The role of Si addition on the interfacial interaction in FeAl diffusion layer

Akdeniz, M. Vedat; Mekhrabov, Amdulla O.; Yılmaz, Tuğba

doi:10.1016/0956-716x(94)90471-5

Cited by 89 publications

(39 citation statements)

References 5 publications

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“…The presence of this inhibition layer can suppress the formation and growth of intermetallic compounds FeAl 3 and Fe 2 Al 5 which impair coating adherence and formability. 14) A thin FeAl 3 layer was observed at the interface between Fe 2 SiAl 7 inhibition layer and steel substrate. This is in agreement with previous work.…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

Coating Degradation in Hot Press Forming

Fan

Kim

et al. 2010

ISIJ Int.

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“…To improve the physical properties of the intermetallic compound layer that is created during the interfacial reaction between the steel surface and molten Al, studies are underway to control the variables in the HDA process, such as the dipping time, the dipping temperature, and the chemical composition of the molten Al. 2,3,11) Most studies to date have attempted to understand the physical and mechanical properties of the intermetallic compound layer as well as its formation behavior when Al-Si alloy below its eutectic point is hot dip aluminized onto carbon steel with a carbon content below 1.0 wt.%. However, these studies have not paid sufficient attention to the HDA of materials with high carbon content such as cast iron (2.0 wt.%C~) which is used in various ways as a component material, with the hypereutectic Al-Si alloy.…”

Section: Introductionmentioning

confidence: 99%

Formation Behavior of an Intermetallic Compound Layer during the Hot Dip Aluminizing of Cast Iron

et al. 2012

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Hot dip aluminizing (HDA) is an effective way to improve the high temperature corrosion resistance and scaling resistance of ferrous materials. The formation of intermetallic compound layers between the two materials is a dominant factor in determining the properties of hot dip aluminized steel. The formation behavior of the intermetallic compound layer between a Si alloyed Al melt and cast iron has been investigated.The thickness of the intermetallic compound layer was significantly reduced as a result of the increased carbon content of the cast iron matrix. The thickness of the intermetallic compound layer formed in the Al-Si-Fe three-component alloy system remains constant in the early stage of the reaction, and it becomes increasingly rough with increased reaction time. The increased roughness could be attributed to the increased Fe concentration in the Al-Si melt near the cast iron surface, which is a result of the increased inter-diffusion of Al, Si and Fe atoms with increased reaction time by which the formation, melting and spallation of the intermetallic compound layer is enhanced.KEY WORDS: hot dip aluminizing; cast iron; intermetallic compound layer; silicon effect; carbon effect.

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“…Akdeniz et al [78] explained that the influence of Si addition in Al on the reduction in IL growth between Fe and Al is the result of the reduction in the activity coefficient of Al. The physical interpretation of their explanation is that since the term activity is defined as the measure of 'effective concentration' of the element of interest, the added Si reduces the effective population of Al atoms and therefore reduces interdiffusion layer formation.…”

Section: Mechanism Of Si Effect On Il Reductionmentioning

confidence: 99%

Improved performance of U-Mo dispersion fuel by Si addition in Al matrix.

Kim¹,

Hofman²

2011

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The role of Si addition on the interfacial interaction in FeAl diffusion layer

Cited by 89 publications

References 5 publications

Coating Degradation in Hot Press Forming

Coating Degradation in Hot Press Forming

Formation Behavior of an Intermetallic Compound Layer during the Hot Dip Aluminizing of Cast Iron

Improved performance of U-Mo dispersion fuel by Si addition in Al matrix.

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