Modeling of Geometric Pore Parameters for the Sintered Matrix (Fe-0.85Mo-0.35C) to Study the Effect of Pore Size and Shape on Elastic Properties of Steels
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Date
2023-06
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Addis Ababa University
Abstract
Porosity is a void and inherent characteristic of powder metallurgy (PM) material. This thesis work is modeling of representative volume element (RVE) microstructures with square, triangular and rectangular pore shape with different circularity and study the effect of pore shape and pore parameters on material properties for the Sintered steel (Fe-0.85Mo-0.35C) using finite element method (FEM). Solidwork and Digimat were used to model RVE microstructure and ABAQUS to simulate the process. A parametric study is conducted to investigate the effect of neck radius of curvature (R’=0, R’=0.5, R’=1 and R’=1.5), equivalent diameter, circularity and fraction of load bearing section. The low circularity is determined pore which is 0.21, and the high circularity is determined for circularity pore (1). The low circularity 0.21 yield strength is 348.55 𝑀𝑃𝑎 and high circularity of 1 yield strength is 719.24 𝑀𝑃𝑎. Besides, sharpness of pore, triangular pore has good yield strength than square and rectangular pore. For the effect of neck radius of curvature (R’ = 0) square pore have high elastic modulus (160.98 𝐺𝑝𝑎) and triangular pore have low elastic modulus (147.68 𝐺𝑝𝑎). And (R’ = 1.5) triangular pore have high elastic modulus (176.2 𝐺𝑝𝑎). With circularity of pore from all pore model triangular have low circularity of 0.21 with low elastic modulus of 147.68 𝐺𝑝𝑎 and high circularity of 1 with high elastic modulus 184.75 𝐺𝑝𝑎. There is high equivalent diameter in rectangular pore of with low elastic modulus (149.84 𝐺𝑝𝑎) and low in triangular pore with high elastic modulus (184.75 𝐺𝑝𝑎). RVE Microstructure with 8 % square triangular and rectangular pore shows direct relationship between the circularity, neck radius of curvature and fraction of load bearing with the mechanical properties of the material. And inverse relationship between pore size and mechanical properties of material.