Improved Workability of Diameter-Enlarged Process for S35C through Quenching and Tempering Heat Treatment

Abstract:

The hardness test, Charpy impact test, and axial expansion experiment were performed on a medium carbon steel S35C specimen typically used for shaft materials after first subjecting it to quenching and tempering heat treatment under different heating temperatures/time conditions. The effect of the tempering conditions on the mechanical properties of the specimen and the limit of the diameter-enlarged ratio used for evaluating the workability of the partial diameter-enlarged were investigated. The summary of the results are as follows: after quenching at 880 °C, a fine troostite or sorbite structure was obtained under all heat treatment conditions at heating temperatures of 550 °C to 675 °C, and heating times of 0.5 h to 1.5 h. An improvement was shown in the limit of the diameter-enlarged ratio because the quenching and tempering heat treatment led to an increase in the Charpy impact value/ductility as well as a reduction in the hardness, tensile strength, and yield strength; the partial diameter-enlarged process could be performed on the heat treated material at almost the same deformation speed as a cold-drawn material with a much lower axial pressure; it was possible to estimate the diameter-enlarged deformation behavior using the tempering parameter M. We confirmed that the quenching tempering heat treatment performed in this study facilitates the improvement of the workability of the diameter-enlarged.

• Periodical: Materials Science Forum (Volume 943)
• Pages: 26-33
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.943.26
• Online since: January 2019
• Authors: Xia Zhu*, Keiji Ogi, Nagatoshi Okabe
• Keywords: Diameter-Enlarged Processing Method, Diameter-Enlarged Ratio, Microstructure, Tempering Parameter, Tempering Temperature, Tempering Time

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