Abstract
This study on hybrid premix sponge ferrous sintered materials is focused on its mechanical properties and microstructure with respect to the amount of porosity. The pressure of 430 MPa and sintering temperatures 1090?C, 1115?C, and 1130?C in a Nitrogen atmosphere for an hour is followed to produce this hybrid premix sponge ferrous compact. Radial crush strength, dimensional change and micro hardness test were performed on these samples to determine the mechanical properties. Scanning electron microscope (SEM) was used for fractured surface analysis, while light optical microscopy (LOM) is used to study the structure and pore formation. The study infers, as porosity percentage increased, tendency of irregular pore formation increased with simultaneous decrease in mechanical properties of the sample. Temperature of sintering has a vital role in decreasing the porosity of powder materials.
Highlights
Powder metallurgy is a net shape manufacturing approach, which is very attractive because of its ability to form powders directly into finished components
When the sintering temperature increased to 1115 °C, it showed an increase in linear growth of about 0.113 % which was caused because of the melting and diffusion of melted copper in the iron-carbon alloy as shown in Fig. 8b and the photomicrograph confirms that unmelted copper is absent in the structure, which shows that there has been a complete diffusion of carbon in iron matrix and is proved by the absence of ferrite in the structure and a subsequent particle to particle bonding was seen
From the results obtained for the three different sample groups with varying porosity, it can be concluded as follows: 1. Increase in radial crush strength and micro hardness occurs when sintered density increases
Summary
Powder metallurgy is a net shape manufacturing approach, which is very attractive because of its ability to form powders directly into finished components. Powder metal sintered components are preferred in industrial production due to their low energy consumption, minimum loss of raw powder, elimination of rejects, secondary operation, excellent size control and cost effectiveness. Among these elements ferrous powder is the most commonly used sintered component. Addition of Brass 10 % with iron plays a major role in determining the mechanical properties and microstructure with an optimum sintering temperature less than or equal to 1000 °C [11]. Very few works have been reported about the effect of porosity, density, sintering temperature on hybrid ferrous powder especially on mechanical and microstructure. The pore morphology and fractured surfaces of the radial crush strength samples were investigated using SEM, and light optical microscope (LOM)
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