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Metallurgical investigation in weldability of Aluminium Silicon coated boron steel with different coating thickness.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2015 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Hot-pressed aluminium and silicon coated boron steel is used in the car industry where high tensile strength is of great importance, such as in the safety cage of a car where deformation has to be kept to a minimum in case of a collision. After hot-pressing the AlSi-boron steel shows excellent properties with high tensile strength, minimal spring back and also shows good protection against corrosion. A thickness of the AlSi coating of 150 [g/m2] for AlSi coated boron steel is typically used by the car industry today. However the coating thickness would be desirable to be minimized to 80 [g/m2]. Welding of this boron steel with 80 [g/m2]have shown difficulties; and it’s not clear why this occurs.

In this report the metallurgical properties of the different coating layers will be investigated, simulations with Thermocalc module Dictra will be used, SEM/EDS will be used to characterize phases in coating layers and correlate to weldability. Resistance spot welding tests will also be performed where the welding parameters of pre-pulse, pulse time, time in between pulses and current will be varied to achieve desirable weld plug diameter without expulsion. Hardness testing in form of micro Vickers will executed. The Materials used will be USIBOR® 1500, AS80 with four different annealing times and one sample of AS150.

Place, publisher, year, edition, pages
Keyword [en]
boron steel, AlSi coating, weldability, hot stamping, phase formation
National Category
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-171209OAI: diva2:842693
Subject / course
Materials Design and Engineering
Educational program
Bachelor of Science in Engineering
Available from: 2015-08-11 Created: 2015-07-21 Last updated: 2015-08-11Bibliographically approved

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Manufacturing, Surface and Joining TechnologyMetallurgy and Metallic Materials

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