A semi-empirical method for predicting hardened case depths in laser heat treating |
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| Affiliation: | 1. School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, PR China;2. School of Mechanical Engineering, Shijiazhuang Railway Institute, Shijiazhuang 050043, Hebei Province, PR China;1. National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, PR China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, PR China;1. TNO, The Netherlands;2. Eindhoven University of Technology, The Netherlands;1. Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal;2. Centro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal |
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| Abstract: | Some predictions on the hardness and hardening depths on laser heat treatment of steels can be obtained when specific characteristics of both laser processes (heating and cooling rates) and laser heat treated steels (microhardness profiles) are taken into account. Some controlled surface temperature laser heat treatments have been carried out with a medium power c.w. CO2 laser on a medium carbon steel (AISI/SAE1045), allowing these predictions to be tested. In particular, knowing the surface temperature has enabled an analytical algorithm to be used to describe thermal processes and a simple exponential expression to be employed to carefully predict the hardened case depth. |
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