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A study of void nucleation, growth, and coalescence in spheroidized 1518 steel

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Abstract

The ductile fracture of a spheroidized 1518 steel has been investigated using three types of tensile specimens — smooth tensile, notched tensile, and plane-strain tensile. It was found that void nucleation has two different modes (Type I and Type II) depending on local conditions, the most important of which are the size, shape, and distribution of the particles. By identifying the low-strain-range nucleation behavior (Type I), it was possible to determine the value of plastic strain, εN, after which void nucleation at average-sized carbide particles (Type II) begins; εN is 0.45 for the smooth tensile case, 0.30 for the notched, and 0.25 for the plane strain. The critical stress for Type II void nucleation, σc, is of the order of 1200 MPa. Void growth depends on the macroscopic stress-strain state: longitudinal growth is given by a linear function of applied plastic strain, εp, whereas lateral growth shows a linear dependence on the triaxial stress, σT. When the local value ofV f reaches a critical volume fraction of voids (V crif = 5 ± 0.5 pct), void coalescence occurs in a catastrophic manner, leading to final separation within a highly localized zone. The stress concentration caused by the notched tensile specimen geometry and the localized mode of plastic flow caused by the constraint of the plane-strain state in a Clausing-type specimen were found to affect the substeps of void nucleation, growth, and coalescence.

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Authors and Affiliations

  1. Korea Standards Research Institute, Daedok Science Town, P.O. Box 3, Daejon, South Korea

    D. Kwon (Senior Researcher)

  2. Department of Applied Mechanics and Engineering Sciences, University of California, 92093, San Diego, La Jolla, CA

    R. J. Asaro (Professor)

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  1. D. Kwon
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  2. R. J. Asaro
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Formerly Graduate Research Assistant, Division of Engineering, Brown University.

Formerly Professor, Division of Engineering, Brown University, Providence, RI.

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Kwon, D., Asaro, R.J. A study of void nucleation, growth, and coalescence in spheroidized 1518 steel. Metall Trans A 21, 117–134 (1990). https://doi.org/10.1007/BF02656430

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  • DOI: https://doi.org/10.1007/BF02656430

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