Abstract
When implementing new progressive forming technologies and thermomechanical treatments, it is necessary to pay attention to side effects, which negatively influence the semiproduct quality. During heating to the forming temperature in hot or warm forming operations, semiproducts are exposed to high temperatures in direct contact with corrosion environment for a certain period of time. Using protective atmospheres in mass production is unsuitable for economical reasons. To minimise the influence of heating on the surface degradation, it is necessary to reach the desired temperature and uniform temperature field as quickly as possible, yet in compliance with physical properties of the heated material and with the technology in use. The experiments were focused on investigation of various temperatures and heating times simulating conditions of dynamical and classical processes. The comparison of the influence of heating temperature and time on the iron scale occurrence intensity as well as the influence on the surface layers of the semiproducts was performed.
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