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Investigating the Effect of Stearic Acid on the Mechanical, Rheological, and Microstructural Properties of AISI 4605 Feedstock for Metal Injection Molding Process

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Abstract

Nowadays, the metal injection molding (MIM) process is a manufacturing method to produce complex shape components. Feedstock preparation in this process is vital because produced feedstock defects can be detrimental in the following processing steps. In this study, effect of the percentage of stearic acid (SA) is investigated on the density, strength, hardness, rheological properties, and microstructure of a part made by 4605 low-alloy steel powder using the MIM process. For this reason, feedstock with different percentages of SA from 1 to 17% has been produced. Mechanical and physical properties show that SA, as a surfactant, has two impacts on the results. SA from 1 to 9% improves the powder particle’s distribution in the binder system and increases the strength and density of the sintered bodies. The results also indicate that with more surfactant growth, the density and strength dramatically decrease due to lower carbon in the sintered parts. The carbon content determines the final sample’s microstructure, which has a substantial influence on the properties. Besides, it can be inferred from the results that the hardness lessens with a gentle slope as the amount of SA in the binder system increases. From the perspective of rheological properties, more SA results in higher sensitivity of feedstocks to the shear rate.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Materials and Manufacturing Processes, Malek Ashtar University of Technology, Tehran, Iran

    Vahid Momeni

  2. Department of Mechanical Engineering, NazarAbad Center, Karaj Branch, Islamic Azad University, Karaj, Iran

    Ali Askari

  3. Center for Composite Materials, Faculty of Materials and Manufacturing Processes, Malek Ashtar University of Technology, Tehran, Iran

    Mohammad Hossein Allaei

  4. Department of Materials Engineering, Faculty of Materials and Manufacturing Processes, Malek Ashtar University of Technology, Tehran, Iran

    Hadi Zangi

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  1. Vahid Momeni
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  2. Ali Askari
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  4. Hadi Zangi
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Correspondence to Ali Askari.

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Momeni, V., Askari, A., Allaei, M.H. et al. Investigating the Effect of Stearic Acid on the Mechanical, Rheological, and Microstructural Properties of AISI 4605 Feedstock for Metal Injection Molding Process. Trans Indian Inst Met 74, 2161–2170 (2021). https://doi.org/10.1007/s12666-021-02282-x

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