Laser-welded Dissimilar Steel-aluminum Seams for Automotive Lightweight Construction

Schimek, Mitja; Springer, André; Kaierle, Stefan; Kracht, Dietmar; Wesling, Volker

doi:10.1016/j.phpro.2012.10.012

Cited by 33 publications

(16 citation statements)

References 6 publications

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“…during attrition milling, the powder is subjected to various forces and undergoes severe plastic deformation. This deformation consumes the kinetic energy 1 2 mv 2 (m: mass of the ball and v: velocity of the ball) of the ball and results in an increase in the diameter and decrease in the thickness of the powder. Moreover, the kinetic energy of the balls, and hence the flattening of the powder, increases with increasing milling speed and time.…”

Section: Methodsmentioning

confidence: 99%

“…Vehicle energy efficiency can be increased by reducing the vehicle weight, which can be accomplished by developing structural materials with high specific strength. Aluminum (Al) has received particular attention as a lightweight structural material in the automotive, 1 aerospace, 2 and electronic industries. 3 Furthermore, Al-based composites, consisting of hard and light reinforcements, exhibit the aforementioned qualities and simultaneously compensate for the low strength/stiffness and high thermal expansion limitations of monolithic aluminum.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of reduced graphene oxide/aluminum nanocomposites via chemical-mechanical processes

Kim

Kang

Nam

et al. 2018

Journal of Composite Materials

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The present study employed a combination of solution-based synthesis and mechanical milling to develop reduced graphene oxide/aluminum composites, in order to achieve uniform dispersion of reduced graphene oxide and strong interfaces between reduced graphene oxide and aluminum. First, spherical aluminum powder was flattened via mechanical milling to afford a large specific surface area and many reaction sites for the graphene oxide. A hydrophilic surface was then created by coating the aluminum powder with polyvinyl alcohol. The polyvinyl alcohol-coated aluminum slurry was mixed with a graphene oxide suspension, thereby inducing a reaction between graphene oxide and polyvinyl alcohol via hydrogen bonding. After thermal reduction, the composite powder was further ball milled and hot-pressed at 500℃ to produce a reduced graphene oxide/aluminum composite. The dispersion of reduced graphene oxide in the composite, as well as the mechanical and thermal behaviors of the composite, improved with increased flattening and specific surface area of the starting aluminum powder.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of reduced graphene oxide/aluminum nanocomposites via chemical-mechanical processes

Kim

Kang

Nam

et al. 2018

Journal of Composite Materials

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“…There are several difficulties arising mainly from dissimilarities in mechanical and physical properties of the aluminum and steel such as thermal expansion coefficient, conductivity and melting points [1]. Compared to traditional welding techniques, laser welding has many advantages, such as high power density, deep penetration depth, a narrower heat-affected zone, lower heat input applied per unit length [2].…”

Section: Introductionmentioning

confidence: 99%

Effects of Heat Input in Laser Welding of Dissimilar Galvanized Steel to Aluminium Alloy

Yüce¹,

Karpat²,

Yavuz³

2018

World Congress on Mechanical, Chemical, and Material Engineering

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The hybrid structures of aluminum-steel have been increasingly used for body-in-white constructions in order to reduce weight and cost. Obtaining acceptable joints between steel and aluminum required a better understanding of welding metallurgy and their effects on the resultant mechanical properties as well as the microstructure of the joints. In this research, laser welding of galvanized steel and aluminum alloy in an overlapped configuration was carried out. The influence of heat input on the weld bead dimension, microstructural and mechanical properties of the joints was studied. The experimental results showed that the penetration depth and weld width increased with the increase of heat input level. However, in order to limit IMC layer thickness and hardness at the surface of the weld seam and aluminum alloy, iron to aluminum dilution should be restricted by limiting the penetration depth. At lower heat input levels, less brittle IMC formation was formed. Consequently, with limited penetration depths at low heat input levels, tensile shear load increased, with failures located in the interface of the joints.

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“…1, there are several types of intermetallic compounds, among others: Fe3Al, FeAl, FeAl2, Fe2Al5 and FeAl3. There have been several investigations on the intermetallic compound analysis at the interface when molten aluminum comes in contact with solid steel in many cases of joining and casting [16][17][18][19][20][21][22][23][24]. They have conclusively reported the natures of intermetallic compounds which brittle and hard.…”

Section: Introductionmentioning

confidence: 99%

Effect of Degassing Treatment on the Interfacial Reaction of Molten Aluminum and Solid Steel

Triyono

Muhayat

Supriyanto

et al. 2017

Archives of Foundry Engineering

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The gas porosity is one of the most serious problems in the casting of aluminum. There are several degassing methods that have been studied. During smelting of aluminum, the intermetallic compound (IMC) may be formed at the interface between molten aluminum and solid steel of crucible furnace lining. In this study, the effect of degassing treatment on the formations of IMC has been investigated. The rectangular substrate specimens were immersed in a molten aluminum bath. The holding times of the substrate immersions were in the range from 300 s to 1500 s. Two degassing treatments, argon degassing and hexachloroethane tablet degassing, were conducted to investigate their effect on the IMC formation. The IMC was examined under scanning electron microscope with EDX attachment. The thickness of the IMC layer increased with increasing immersion time for all treatments. Due to the high content of hydrogen, substrate specimens immersed in molten aluminum without degasser had IMC layer which was thicker than others. Argon degassing treatment was more effective than tablet degassing to reduce the IMC growth. Furthermore, the hard and brittle phase of IMC, FeAl3, was formed dominantly in specimens immersed for 900 s without degasser while in argon and tablet degasser specimens, it was formed partially.

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Laser-welded Dissimilar Steel-aluminum Seams for Automotive Lightweight Construction

Cited by 33 publications

References 6 publications

Synthesis of reduced graphene oxide/aluminum nanocomposites via chemical-mechanical processes

Synthesis of reduced graphene oxide/aluminum nanocomposites via chemical-mechanical processes

Effects of Heat Input in Laser Welding of Dissimilar Galvanized Steel to Aluminium Alloy

Effect of Degassing Treatment on the Interfacial Reaction of Molten Aluminum and Solid Steel

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