Mechanical Properties of AlSi12 Alloy Manufactured by Laser Powder Bed Fusion Technique
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TECHNICAL ARTICLE—PEER-REVIEWED
Mechanical Properties of AlSi12 Alloy Manufactured by Laser Powder Bed Fusion Technique Masaaki Kimura . Akihiro Hirayama . Junya Yoshioka . Hosei Maekawa . Masahiro Kusaka . Koichi Kaizu . Tsuyoshi Takahashi
Submitted: 13 May 2020 / in revised form: 31 July 2020 Ó ASM International 2020
Abstract Mechanical properties of AlSi12 alloy, which was manufactured by laser powder bed fusion (LPBF) technique, were investigated. Some basic properties of fabricated objects such as density and tensile strength were clarified. The suitable laser irradiation condition of fabricated objects that had own high relative density was showed. The microstructure of fabricated objects with asmanufactured condition was also evaluated. The fabricated objects exhibited the similar ultimate tensile strength and the Young’s modulus according to the building directions, although other mechanical properties slightly differed. Mechanical properties of fabricated objects made by reused powders also exhibited the similar values of those manufactured by unused powders. In contrast, the mechanical properties excluding the Young’s modulus of the fabricated objects, which were annealed, differed due to annealing treatment. Furthermore, the mechanical properties excluding the Young’s modulus of the fabricated objects for the designed shapes manufactured to the tensile test specimen M. Kimura (&) M. Kusaka K. Kaizu Department of Mechanical Engineering, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan e-mail: [email protected] A. Hirayama J. Yoshioka Hyogo Prefectural Institute of Technology, 3-1-12 Yukihira-cho, Suma-ku, Kobe, Hyogo 654-0037, Japan H. Maekawa University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan T. Takahashi Department of Creative Engineering, Kushiro College, National Institute of Technology, 2-32-1 Otanoshike-Nishi, Kushiro, Hokkaido 084-0916, Japan
were smaller than those of the fabricated objects machined from LPBFed rectangular block. Therefore, the attention is necessary for the mechanical design of fabricated object through LPBF technique and that with annealing treatment, because of the difference in the mechanical properties between the object built as the designed shape and the object made from LPBFed bulk product. Keywords Laser powder bed fusion technique AlSi12 alloy Building direction Mechanical property Annealing Designed shape
Introduction Additive manufacturing (AM) technique has several merits for making various products (referred to as fabricated products here) such as an easily produce of a complex shape and high flexibility for customizations. AM process can easily manufacture the fabricated product that is difficult or impossible to be generated by other conventional manufacturing methods. The fabricated products with various shapes, i.e., the designed shapes, are generally manufactured by using a three-dimensional computer-aided design models, and some types of them are constructed of layers made
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