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Investigations into the size effect on plastic deformation behavior of metallic materials in microcoining process

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Abstract

In this study, the size dependence of metallic materials on the plastic deformation behavior was investigated in microcoining process. In order to conduct experimental works, a miniaturized microforming system was first developed. Then, a series of microcoining experiments were performed in a wide range of process conditions. The effects of grain size and feature size were analyzed by relating the protruded feature height to the size factor λ. It was found that the ratio of channel width to grain size is the critical factor to identify the forming performance in microcoining process. As the size factor decreased below 10, the feature size effect became prominent due to the fact that the reduced number of grains in the deformation region causes the reduced degrees of freedom in slip systems. By observing the protruded feature of the formed parts, the deformation characteristics and underlying physics associated with the miniaturization effects can be discussed.

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Authors and Affiliations

  1. Dept. of Mechanical Engineering, Graduate School of Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Korea, 440-746

    Jung Soo Nam

  2. School of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Korea, 440-746

    Sang Won Lee

  3. Dept. of Mechanical and Automotive Engineering, Seoul National University of Science and Technology, 232, Gongneung-ro, Nowon-gu, Seoul, Korea, 139-743

    Hong Seok Kim

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  1. Jung Soo Nam
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  2. Sang Won Lee
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Correspondence to Hong Seok Kim.

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Nam, J.S., Lee, S.W. & Kim, H.S. Investigations into the size effect on plastic deformation behavior of metallic materials in microcoining process. Int. J. Precis. Eng. Manuf. 15, 5–11 (2014). https://doi.org/10.1007/s12541-013-0300-y

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  • DOI: https://doi.org/10.1007/s12541-013-0300-y

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