Testing the Cross-Sectional Microhardness in Sheets with A 0.08% Carbon Concentration

Abstract:

The research team studied the hardness of cold-rolled sheets of varying thicknesses containing 0.08% carbon. Greater thickness correlated with lower mean hardness. The hardness was found to drop in the middle of a plate and to increase gradually towards the edges. This pattern was observed regardless of the thickness of thin cold-rolled sheet steel. The change in hardness may indicate uneven accumulated strain in the sheets rolled to a desired value. Pre-hardened sheets were analyzed to find whether the hardness was homogeneous through the thickness. The material was hardened by axial tensioning. Analysis showed that at greater accumulated strain, the through-thickness hardness was affected as well. However, the difference was less pronounced at the edge as well as in the middle of sheets. The paper shows graphs of the hardness distribution through thickness.

• Periodical: Solid State Phenomena (Volume 316)
• Pages: 269-275
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.316.269
• Online since: April 2021
• Authors: Sergey A. Tipalin, Vladislav B. Belousov*, Svetlana I. Lyubetskaya
• Keywords: Accumulated Strain, Change of Properties, Hardness, Microhardness, Sheet, Tensioning

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