The Effects of Sn Addition on the Microstructure and Surface Properties of Laser Deposited Al-Si-Sn Coatings on ASTM A29 Steel

3rd International Conference on Mechanical, Manufacturing and Process Plant Engineering

机械制造;工业技术

Fatoba, Olawale S.^1 ; Akinlabi, Stephen A.^2 ; Akinlabi, Esther T.^1

Department of Mechanical Engineering Science, Faculty of Engineering and the Built Environment, University of Johannesburg, South Africa^1

Department of Mechanical and Industrial Engineering Technology, Faculty of Engineering and the Built Environment, University of Johannesburg, South Africa^2

关键词: Alloying process;    Aluminium and its alloys;    Enhanced hardness;    Field emission scanning electron microscopes;    Optimum laser parameters;    Refined microstructure;    Structural component;    X ray diffractometers;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/328/1/012016/pdf
DOI  :  10.1088/1757-899X/328/1/012016

学科分类：工业工程学

来源: IOP

【 摘 要 】

Aluminium and its alloys have been successful metal materials used for many applications like commodity roles, automotive and vital structural components in aircrafts. A substantial portion of Al-Fe-Si alloy is also used for manufacturing the packaging foils and sheets for common heat exchanger applications. The present research was aimed at studying the morphology and surface analyses of laser deposited Al-Sn-Si coatings on ASTM A29 steel. These Fe-intermetallic compounds influence the material properties during rapid cooling by laser alloying technique and play a crucial role for the material quality. Thus, it is of considerable technological interest to control the morphology and distribution of these phases in order to eliminate the negative effects on microstructure. A 3 kW continuous wave ytterbium laser system (YLS) attached to a KUKA robot which controls the movement of the alloying process was utilized for the fabrication of the coatings at optimum laser parameters. The fabricated coatings were investigated for its hardness and wear resistance performance. The field emission scanning electron microscope equipped with energy dispersive spectroscopy (SEM/EDS) was used to study the morphology of the fabricated coatings and X-ray diffractometer (XRD) for the identification of the phases present in the coatings. The coatings were free of cracks and pores with homogeneous and refined microstructures. The enhanced hardness and wear resistance performance were attributed to metastable intermetallic compounds formed.