A phenomenological model for bake hardening in minimal carbon steels |
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| Authors: | Sourav Das Omkar Nath Mohanty Shiv Brat Singh |
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| Institution: | 1. Materials Design, Tata Steel Research and Development, IJmuiden, Netherlands;2. Metallurgical and Materials Engineering Department, IIT Kharagpur, Kharagpur, Indiasourav.z.das@tatasteel.com;4. RSB Metaltech, Adityapur, Jamshedpur, India;5. Metallurgical and Materials Engineering Department, IIT Kharagpur, Kharagpur, India |
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| Abstract: | The essence of bake hardening is to exploit the classical strain ageing in a positive way to increase the strength of the formed steel sheets used in outer body panel of a passenger car during the paint-baking operation. A new model that takes into account the strengthening contributions from Cottrell atmosphere and precipitate formation has been developed in the present work. The model predicts the increase in strength as a function of the amount of free solute C (calculated as a function of the annealing temperature), the amount of deformation, ageing temperature and time. The model predictions have been found to agree quite well with the experimental results; the individual contributions of Cottrell atmosphere and precipitation strengthening have been quantified. |
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| Keywords: | Cottrell atmosphere precipitation dislocation diffusion of C atoms bake hardening |
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