Abstract
In this study, pre-strain ranging from 0 to 0.12 was applied through uniaxial tension on high-strength low-alloy (HSLA) specimens with four kinds of grain size. Effect of pre-strain and grain size on mechanical property was investigated through tensile tests. Microstructures of the pre-strained and tensile tested samples were analyzed, respectively. The 30.8° v-bending and following flattening, as well as Erichson cupping tests, were performed on the pre-strained samples. Results show the elongation ratio of grain and dislocation density increases with pre-strain. Yielding platform is removed when pre-strain is larger than 0.06 while yielding plateau period decreases with pre-strain less than 0.06 due to reduction of pinning effect. The 30.8° v-bending and the following flattening tests are successfully accomplished on all the pre-strained samples with different grain size. Decrease in grain size, along with increase in pre-strain, causes increase in strength and decrease in elongation rate as well as cupping value. Pre-strain causes very slight effect on bending ability, much less than that on mechanical property and cupping test value. Reciprocal impact of the pre-strain and grain size on HSLA steel deformability is inconspicuous.
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Funded by Natural Science Foundation of Guangxi Zhuang Autonomous Region(No.2020JJA160034) and the Basic Ability Improvement of Middle and Young Teachers in Guangxi Universities Foundation(No. 2020KY21018)
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Liu, P., Wen, Z., Liu, Z. et al. Effect of Pre-strain on Microstructure and Stamping Performance of High-strength Low-alloy Steel. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 39, 774–780 (2024). https://doi.org/10.1007/s11595-024-2936-0
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DOI: https://doi.org/10.1007/s11595-024-2936-0