Iwa Kuntadi, Uum Sumirat, Mumu Komaro, Hamzah Fakry Al-Gifari
This study aims to examine the mechanical properties of the material mixer blade AISI 1522 carbon steel and white cast iron due to the hardening process, and to analyse the comparison of the two materials. Concrete mixer blade is a tool used to mix cement, gravel, sand and water homogeneously with the appropriate ratio to form concrete. At present, the market demand forces the production of a mixer that is able to mix materials homogeneously in a short time for the construction industry. In general, the damage experienced by the concrete mixer blade occurs in failure due to fatigue, which is a form of failure that occurs in the material due to dynamic loads that are applied repeatedly so that deformation occurs until cracks or fractures appear, so it is necessary to analyse the mechanical strength of the blades. After knowing the mechanical properties through mechanical testing, a process is carried out heat treatment on the material from the mixer blade which aims to produce the desired material properties so that damage due to mechanical loads can be avoided or minimized. The heat treatment process carried out on the material concrete mixer blade in this study is the process at hardening temperature 850o C, holding time 1 hour with media quenching is oil. Then the process of mechanical and microstructure testing was carried out to determine the effect of the heat treatment given. The increase in mechanical properties is influenced by the carbon content in steel, steel containing more carbon elements produces higher mechanical properties. In this study, the mixer blade material white cast iron has a higher carbon content than AISI 1522 carbon steel, so that due to the heat treatment, the material white cast iron has better mechanical properties than AISI 1522 carbon steel. The increase in tensile strength and hardness occurs in material the mixer blade AISI 1522 carbon steel due to the effect of process heat treatment conducted which amounted to 12.27 kg/m2 and 45.73 HB. Meanwhile, the strength or impact price decreased by 0.91 J/mm2 or 43.5% of the initial impact price. From the observation of the microstructure of the AISI 1522 material carbon steel, there was an increase in the number of pearlite structures after the heat treatment. However, the martensitic microstructure was not formed because the composition of the alloy (amount of % carbon) was only 0.185 % which was included in the type of low carbon steel. So that the heat treatment does not result in a significant increase in hardness. © School of Engineering, Taylor’s University.
Department of Mechanical Engineering Education of Universitas Pendidikan Indonesia, Jl. Dr. Setia Budi 299, Bandung, 40154, Indonesia
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