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Correlation Study Between Material Parameters and Mechanical Properties of Iron–Carbon Compacts Using Sensitivity Analysis and Regression Model

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Abstract

Changing the material parameters such as powder characteristics and additives affects the final properties of an iron–carbon alloy. This study investigated the influences of three typical material parameters, iron particle size, graphite addition, and powder lubricant addition, on the density and mechanical properties of an iron–carbon alloy formed via powder compaction and sintering. Each material parameter was designed with five levels, and all of the powder mixtures were compacted under 500 MPa and sintered at 1120 °C for 30 min. The microstructure of the samples was observed for the green part and sintered part. Through the tensile test, yield strength, ultimate tensile strength, and elongation were measured. The tensile fracture surface was also examined to understand the changes in mechanical properties according to the parameters. The correlations between mechanical properties and material parameters were characterized by the mapping functions, and a sensitivity analysis was carried out to investigate which parameter had the larger influence on the mechanical properties. The results showed that graphite addition has the greatest influence on the mechanical properties due to the microstructural changes from hypoeutectoid structure to hypereutectoid structure. Further, a regression model was developed to describe the mechanical response of the iron–carbon alloy depending on the material conditions.

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Acknowledgements

This work was supported by POSCO (2015Y005) and the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Education (NRF-2013R1A1A2013765).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    Da Seul Shin, Suk Hyun Kim, Joo Won Oh, Woo Seok Yang, Chi Hun Lee, Hyeok Joon Kwon & Seong Jin Park

  2. Department of Powder Technology, Korea Institute of Materials Science (KIMS), Changwon, 51508, Republic of Korea

    Im Doo Jung

  3. Materials Performance Research Group, Pohang Iron and Steel Company (POSCO), Incheon, 21985, Republic of Korea

    Jin Mo Koo

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  1. Da Seul Shin
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Correspondence to Seong Jin Park.

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Shin, D.S., Kim, S.H., Oh, J.W. et al. Correlation Study Between Material Parameters and Mechanical Properties of Iron–Carbon Compacts Using Sensitivity Analysis and Regression Model. Met. Mater. Int. 25, 1258–1271 (2019). https://doi.org/10.1007/s12540-019-00278-3

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