The Effect of Quenching Temperature and Polishing Force on the Residual Stress and Deformation of Rack Bar Semi-Products

Abstract:

In the present study, the residual stress state and macroscopic deformation of automotive rack bar semi-products were examined. The rack bars were taken from the original production line after induction hardening, burnishing and polishing. Induction hardening was performed at 860°C, 880°C and 900°C and the polishing step was performed with standard and increased polishing force. Thus, the effect quenching temperature and polishing force are described. Non-destructive residual stress mapping was performed after which macroscopic deformation measurements were carried out on the same rods. It was shown that the variation of quenching temperature had no effect on the residual stress state and deformation of the components. The increased polishing force did not change the average stress state of the rods, however, it resulted in higher stress asymmetry and deformation of the rods. Stress asymmetry was shown to be the cause of bending of the rods.

• Periodical: Materials Science Forum (Volume 885)
• Pages: 1-6
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.885.1
• Online since: February 2017
• Authors: Jozsef Majtenyi, Márton Benke, Valéria Mertinger, Tímea Kazinczi
• Keywords: Induction Hardening, Rack Bar, Residual Stress, X-Ray Diffraction

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